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# Mental Math

Mental Math. Set 3. Mental Math # 1. 6700 + 208 = 3000 + 700 + 220 = 10.3 + 5.7 + 4.2 = 10.9 – 3.5 = You give \$20 for a purchase costing \$4.30 What is your change? 550 + 150 + ? = 1000 The sum of two cubed and two squared = 726  6 = 11.5 x 100 = 51.37  10 =. Mental Math # 1.

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## Mental Math

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1. Mental Math Set 3

2. Mental Math # 1 • 6700 + 208 = • 3000 + 700 + 220 = • 10.3 + 5.7 + 4.2 = • 10.9 – 3.5 = • You give \$20 for a purchase costing \$4.30 What is your change? • 550 + 150 + ? = 1000 • The sum of two cubed and two squared = • 726  6 = • 11.5 x 100 = • 51.37  10 =

3. Mental Math # 1 • 6700 + 208 = 6908 • 3000 + 700 + 220 = 3920 • 10.3 + 5.7 + 4.2 =20.2 • 10.9 – 3.5 = 7.4 • You give \$20 for a purchase costing \$4.30 What is your change? \$15.70 • 550 + 150 + 300 = 1000 • The sum of two cubed and two squared = 12 • 726  6 = 121 • 11.5 x 100 = 1150 • 51.37  10 = 5.137

4. Mental Math # 2 • Which is larger –4 or -7 = • 3 + -5 = • 100.5 + 20.1 = • 8.4 – 3.1 = • You give \$100 for a purchase costing \$65.00 What is your change? • 70 + 500 + ? = 1000 • 3100 x 10 = • 805  5 = • 5.3 x 100 = • 1.3  10 =

5. Mental Math # 2 • Which is larger –4 or -7 = -4 • 3 + -5 = -2 • 100.5 + 20.1 = 120.6 • 8.4 – 3.1 = 5.3 • You give \$100 for a purchase costing \$65.00 What is your change? \$35.00 • 70 + 500 + 430 = 1000 • 3100 x 10 = 31 000 • 805  5 = 161 • 5.3 x 100 = 530 • 1.3  10 = 0.13

6. Mental Math # 3 1) = 2) = 3) = 4) = 5) = 6) = 7) = 8) = 9) = 10) =

7. Mental Math # 3 1) = -1 2) = -2 3) = +2 4) = 0 5) = -1 6) = 0 7) = +3 8) = -1 9) = -6 10) = -1

8. Mental Math # 4 • (-5) + (-3) = • (+8) + (-2) = • (-2) + (-4) = • (-5) + (+10) • You owe you friend \$20. You earn \$15 babysitting. What is your net worth? • (50) - (-10) = • (-5) + (+3) = • -2 - -6 = • 575  5 = • -2 - +10 =

9. Mental Math # 4 • (-5) + (-3) = -8 • (+8) + (-2) = +6 • (-2) + (-4) = -6 • (-5) + (+10)= +5 • You owe you friend \$20. You earn \$15 babysitting. What is your net worth? \$-5 • (50) - (-10) = 60 • (-5) + (+3) = -2 • -2 - -6 = +4 • 575  5 = 115 • -2 - +10 = -12

10. Mental Math # 5 • (-6) + (-3) = • (8) + (-2) = • (-2) - (-4) = • (5) x (-10) = • You owe you friend \$20. You earn \$8. What is your net worth? • (50) - (-10) = • (-5) + (+3) = • -20 x -60 = • 555  -5 = • 2 groups of -10 =

11. Mental Math # 5 • (-6) + (-3) = -9 • (8) + (-2) = 6 • (-2) - (-4) = +2 • (5) x (-10) -50 • You owe you friend \$20. You earn \$8. What is your net worth? \$-12 • (50) - (-10) = 60 • (-5) + (+3) = -2 • -20 x -60 = 1200 • 555  -5 = -111 • 2 groups of -10 = -20

12. Mental Math # 6 • (-2) + (+7) = • (-8) - (-5) = • (-5) - (-10) = • (-6) x (-5) = • You have \$50. You earn \$20 babysitting. You purchase two tickets for a concert costing \$10 each. What is your net worth? • Negative 10 squared = • (+5) + (-3) = • 500 x -7 = • -448  -2 = • Yesterday we earn \$230 selling cotton candy. Last night we earned \$150. Our expenses so far is \$20. What is our net profit. =

13. Mental Math # 6 • (-2) + (+7) = +5 • (-8) - (-5) = -3 • (-5) - (-10) = +5 • (-6) x (-5) = 30 • You have \$50. You earn \$20 babysitting. You purchase two tickets for a concert costing \$10 each. What is your net worth? \$50 • Negative 10 squared = 100 • (+5) + (-3) = +2 • 500 x -7 = -3500 • -448  -2 = 224 • Yesterday we earn \$230 selling cotton candy. Last night we earned \$150. Our expenses so far is \$20. What is our net profit. = \$360

14. Mental Math # 7 • (-12) - (+3) = • (-2) - (-5) = • (-5) (-10) = • 4 + -5 = • You owe \$60. You earn \$5 an hour babysitting. You baby-sit for 5 hours. What is your net worth? • -23 = • (+5) . (-3) = • -10 x –10 x –10 x -10 = • -4 + ? = -1 • -60 = 3

15. Mental Math # 7 • (-12) - (+3) = -15 • (-2) - (-5) = +3 • (-5) (-10) = +50 • 4 + -5 = -1 • You owe \$60. You earn \$5 an hour babysitting. You baby-sit for 5 hours. What is your net worth? \$-35 • -23 = -8 • (+5) . (-3) = -15 • -10 x –10 x –10 x -10 = 10 000 • -4 + 3 = -1 • -60 = -20 3

16. Mental Math # 8 • 3.1 x 102 = • (-5) + (+1) = • 10.5 + 20.5 + 0.6 = • (+5) + (-4) = • You give \$100 for a purchase costing \$90.90 What is your change? • 7 x 100 + 5 x 10 + 3 x 1 = • (-3) + (-2) = • 729  3 = • 52 = • (-3) – (-5) =

17. Mental Math # 8 • 3.1 x 102 = 310 • (-5) + (+1) = -4 • 10.5 + 20.5 + 0.6 = 31.6 • (+5) + (-4) = +1 • You give \$100 for a purchase costing \$90.90 What is your change? \$9.10 • 7 x 100 + 5 x 10 + 3 x 1 = 753 • (-3) + (-2) = -5 • 729  3 = 243 • 52 = 25 • (-3) – (-5) = +2

18. Mental Math # 9 • 2.3 x 102 = • 3 + -2 = • 50 = • 9 + 40.3 + 0.5 = • \$10.00 - \$6.75 = • 345 000 in scientific notation = • (-4) + (+4) = • 255  5 = • 4.2 x 1000 = • 23 =

19. Mental Math # 9 • 2.3 x 102 = 230 • 3 + -2 = 1 • 50 = 1 • 9 + 40.3 + 0.5 = 49.8 • \$10.00 - \$6.75 = \$3.25 • 345 000 in scientific notation = 3.45 x 105 • (-4) + (+4) = 0 • 255  5 = 51 • 4.2 x 1000 = 4200 • 23 = 8

20. Mental Math # 10 • Double 3000 = • 3 x 1000 + 5 x 100 = • 7.1 + 8.8 + 1.2 = • You spend \$5.48. You have \$10.00. What is your change? • \$100.00 + \$432.90 = • 670 + ? = 1000 • 542 x 100 = • Three cubed = • 844  4 = • 81 groups of 102 =

21. Mental Math # 10 • Double 3000 = 6000 • 3 x 1000 + 5 x 100 = 3500 • 7.1 + 8.8 + 1.2 = 17.1 • You spend \$5.48. You have \$10.00. What is your change? \$4.52 • \$100.00 + \$432.90 = \$532.90 • 670 + 330 = 1000 • 542 x 100 = 54200 • Three cubed = 27 • 844  4 = 211 • 81 groups of 102 = 8100

22. Mental Math # 11 • Double 2000 and add 300 = • 6 x 102 + 3 x 100 = • 8.1 + 2.9 + 4.2 = • You spend \$5.70 You have \$10.00. What is your change? • Half of 400 minus 10 = • Multiple 9 groups of 50 = • 62 x 100 = • Four squared = • 784  100 = • 3.2 x 103 =

23. Mental Math # 11 • Double 2000 and add 300 = 4300 • 6 x 102 + 3 x 100 = 603 • 8.1 + 2.9 + 4.2 = 15.2 • You spend \$5.70 You have \$10.00. What is your change? \$4.30 • Half of 400 minus 10 = 190 • Multiple 9 groups of 50 = 450 • 62 x 100 = 6200 • Four squared = 16 • 784  100 = 7.84 • 3.2 x 103 = 3200

24. < A is a ___ angle <‘s B are ___ angles < C is a ___ angle < D is a ___ angle < E is a ___ angle <‘s F are ___ angles < G is a ___ angle Measure of < A is ___ Measure of < G is ___ Measure of < C is most likely 850, 1050, 1350 or 1750? Mental Math # 12 B A B D C E F F G

25. < A is a right angle <‘s B are complementary angle < C is an obtuse angle < D is an obtuse angle < E is an acute angle <‘s F are supplementary angles < G is a straight angle Measure of < A is 900 Measure of < G is 1800 Measure of < C is most likely 850, 1050, 1350 or 1750? Mental Math # 12 B A B D C E F F G

26. Mental Math # 13 • The complement to a 600 angle = • The complement to a 250 angle = • The supplement to a 1000 angle = • The supplement to a 1600 angle = • The supplement to a 500 angle = • The complement to a 720 angle = • The complement to a 550 angle = • The supplement to a 700 angle = • The supplement to a 400 angle = • The reflex angle to a 700 angle =

27. Mental Math # 13 • The complement to a 600 angle = 300 • The complement to a 250 angle = 650 • The supplement to a 1000 angle = 800 • The supplement to a 1600 angle = 200 • The supplement to a 500 angle = 1300 • The complement to a 720 angle = 180 • The complement to a 550 angle = 350 • The supplement to a 700 angle = 1100 • The supplement to a 400 angle = 1400 • The reflex angle to a 700 angle = 2900

28. Mental Math # 14 • The complement to a 750 angle = • The complement to a 290 angle = • The supplement to a 1520 angle = • The supplement to a 1250 angle = • The opposite angle to a 500 angle = • The reflex angle to a 500 angle = • The reflex angle to a 1200 angle = • The measure of angle a = • The measure of angle b = • The measure of angle c = a b c

29. Mental Math # 14 • The complement to a 750 angle = 150 • The complement to a 290 angle = 610 • The supplement to a 1520 angle = 280 • The supplement to a 1250 angle = 550 • The opposite angle to a 500 angle = 500 • The reflex angle to a 500 angle = 3100 • The reflex angle to a 1200 angle = 2400 • The measure of angle a = 450 • The measure of angle b = 900 • The measure of angle c = 450 a b c

30. Mental Math # 15 • The m < a = • The m < b = • The m < c = • The m < d = • The m < e = • The m < f = • The m < g = • The m < h = • The m < i = • The m < j = j a 30o 70o g c b i d h e f

31. Mental Math # 15 • The m < a = 1500 • The m < b = 300 • The m < c = 1500 • The m < d = 300 • The m < e = 1500 • The m < f = 300 • The m < g = 700 • The m < h = 700 • The m < i = 800 • The m < j = 1100 j a 30o 70o g c b i d h e f

32. Mental Math # 16 a • The m < a = • The m < b = • The m < c = • The m < d = • The m < e = • The m < f = • The m < g = • The m < h = • The m < i = • The m < j = 120o b c j d h 80o e i f g

33. Mental Math # 16 a • The m < a = 600 • The m < b = 1200 • The m < c = 600 • The m < d = 1000 • The m < e = 1000 • The m < f = 800 • The m < g = 800 • The m < h = 400 • The m < i = 400 • The m < j = 1400 120o b c j d h 80o e i f g

34. Mental Math # 17 • If m <a is 200, then <c = • If m <d is 1200, then <c = • If m <e is 1150, then <f = • If m <j is 1500, then <h = • If m <b and < f are 600, then <g = • If m <h is 1230, then <i = • If m <f and <g are 500, then <b = • If m <i is 320, then <h = • If m <g is 750, then <j= • If m <f and <g are 600, then <c = a c d b e g f h j i

35. Mental Math # 17 • If m <a is 200, then <c = 1600 • If m <d is 1200, then <c = 1200 • If m <e is 1150, then <f = 650 • If m <j is 1500, then <h = 1500 • If m <b and < f are 600, then <g = 600 • If m <h is 1230, then <i = 570 • If m <f and <g are 500, then <b = 800 • If m <i is 320, then <h = 1480 • If m <g is 750, then <j= 1050 • If m <f and <g are 600, then <c = 1200 a c d b e g f h j i

36. Mental Math # 18 • The m < a = • The m < b = • The m < c = • The m < d = • The m < e = • The m < f = • The m < g = • The m < h = • The m < i = • The m < j = d b c a 20o 30o j f e g i h

37. Mental Math # 18 • The m < a = 1300 • The m < b = 1300 • The m < c = 200 • The m < d = 300 • The m < e = 200 • The m < f = 1600 • The m < g = 1600 • The m < h = 1500 • The m < i = 300 • The m < j = 300 d b c a 20o 30o j f e g i h

38. Mental Math # 19 • The m < a = • The m < b = • The m < c = • The m < d = • The m < e = • The m < f = • The m < g = • The m < h = • The m < i = • The m < j = e d c b 70o a j h g i 50o f

39. Mental Math # 19 • The m < a = 1300 • The m < b = 500 • The m < c = 600 • The m < d = 600 • The m < e = 700 • The m < f = 400 • The m < g = 900 • The m < h = 600 • The m < i = 600 • The m < j = 1200 e d c b 70o a j h g i 50o f

40. Mental Math # 20 • The m < a = • The m < b = • The m < c = • The m < d = • The m < e = • The m < f = • The m < g = • The m < h = • The m < i = • The m < j = e d b c a 60o g j h 50o i f

41. Mental Math # 20 • The m < a = 500 • The m < b = 500 • The m < c = 700 • The m < d = 700 • The m < e = 600 • The m < f = 400 • The m < g = 1300 • The m < h = 700 • The m < i = 700 • The m < j = 1100 e d b c a 60o g j h 50o i f

42. Mental Math # 21 • 3000 + 705 + 20 = • 9000 + 20 + 70 = • 4.1 + 3.6 + 1.9 = • 1000 – 230 = • \$100.00 - \$9.90 = • 180 + ? = 500 • 500 x 20 = • 5 x 101 = • 10 x 27.3 = • 590.1  102 =

43. Mental Math # 21 • 3000 + 705 + 20 = 3725 • 9000 + 20 + 70 = 9090 • 4.1 + 3.6 + 1.9 = 9.6 • 1000 – 230 = 770 • \$100.00 - \$9.90 = \$90.10 • 180 + 320 = 500 • 500 x 20 = 10 000 • 5 x 101 = 50 • 10 x 27.3 = 273 • 590.1  102 = 5.901

44. Mental Math # 22 • Double 650 = • 6 x 1000 + 3 x 100 + 2 x 1= • 5.3 + 2.9 + 5.7 = • You spend \$3.25 You have \$10.00. What is your change? • Half of 450 = • Multiple 40 groups of 60 = • 6.5 x 100 = • Two squared added to three squared = • 6366  3 = • 3 groups of 103 =

45. Mental Math # 22 • Double 650 = 1300 • 6 x 1000 + 3 x 100 + 2 x 1 = 6302 • 5.3 + 2.9 + 5.7 = 13.9 • You spend \$3.25 You have \$10.00. What is your change? \$6.75 • Half of 450 = 225 • Multiple 40 groups of 60 = 2400 • 6.5 x 100 = 650 • Two squared added to three squared = 13 • 6366  3 = 2122 • 3 groups of 103 = 3000

46. Mental Math # 23 • Double the sum of 100 and 150 = • 7 x 103 + 8 x 101 = • 10.8 - 3.4 = • You spend \$69.90 You have \$100.00. What is your change? • 50 + 20 000 + 300 = • Multiple 100 groups of 3.5 = • The quotient of 35 and 5 = • Two cubed = • 900  102 = • 8 x 103 =

47. Mental Math # 23 • Double the sum of 100 and 150 = 500 • 7 x 103 + 8 x 101 = 7080 • 10.8 - 3.4 = 7.4 • You spend \$69.90 You have \$100.00. What is your change? \$30.10 • 50 + 20 000 + 300 = 20 350 • Multiple 100 groups of 3.5 = 350 • The quotient of 35 and 5 = 7 • Two cubed = 8 • 900  102 = 9 • 8 x 103 = 8000

48. Mental Math # 24 • The difference of 70 and 50 times 2 = • 6 x 103 + 2 x 100 • 21.9 + 7.5 = • You spend \$25.25 You have \$100.00. What is your change? • 6000 + 70 000 + 49 = • Multiple 100 groups of 47 = • The quotient of 50 and 10 = • Nine squared = • 760  102 = • 5 x 103 =

49. Mental Math # 24 • The difference of 70 and 50 times 2 = 40 • 6 x 103 + 2 x 100 = 6002 • 21.9 + 7.5 = 29.4 • You spend \$25.25 You have \$100.00 What is your change? \$74.75 5) 6000 + 70 000 + 49 = 76 049 6) Multiple 100 groups of 47 = 4700 7) The quotient of 50 and 10 = 5 8) Nine squared = 81 9) 760  102 = 7.6 10) 5 x 103 = 5000

50. Mental Math # 25 • The product of 60 and 5 added to 49 = • 50 x 102 = • 250 + 350 + 391 = • You spend \$79.45 You have \$100.00. What is your change? • 200 + 900 000 + 4000 + 63 = • Multiple 1000 groups of 2.3 = • The quotient of 555 and 5 = • Six squared, minus ten = • 570  100 = • 5 x 103 + 9 x 101 =

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