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Mental Math

Mental Math. Set 4. Mental Math # 1. ¼ of 20 = ½ of 70 = 2/3 of 18 = 3/5 of 45 = 1/5 x 25 = 1/6 of 30 = ¾ x 16 = 4/5 of 30 = 2/3 of 27 = 5/6 of 36 =. Mental Math # 1. ¼ of 20 = 5 ½ of 70 = 35 2/3 of 18 = 12 3/5 of 45 = 27 1/5 x 25 = 5 1/6 of 30 = 5 ¾ x 16 = 12

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Mental Math

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  1. Mental Math Set 4

  2. Mental Math # 1 • ¼ of 20 = • ½ of 70 = • 2/3 of 18 = • 3/5 of 45 = • 1/5 x 25 = • 1/6 of 30 = • ¾ x 16 = • 4/5 of 30 = • 2/3 of 27 = • 5/6 of 36 =

  3. Mental Math # 1 • ¼ of 20 = 5 • ½ of 70 = 35 • 2/3 of 18 = 12 • 3/5 of 45 = 27 • 1/5 x 25 = 5 • 1/6 of 30 = 5 • ¾ x 16 = 12 • 4/5 of 30 = 24 • 2/3 of 27 = 18 • 5/6 of 36= 30

  4. Mental Math # 2 • 3/5 of 20 = • 3/8 of 72 = • 2/3 of 12 = • ¾ of 32 = • 2/5 x 35 = • 5/6 of 30 = • ¼ x 24 = • 4/5 of 40 = • 2/3 x 30 = • 1/6 x 18 =

  5. Mental Math # 2 • 3/5 of 20 = 12 • 3/8 of 72 = 27 • 2/3 of 12 = 8 • ¾ of 32 = 24 • 2/5 x 35 = 14 • 5/6 of 30 = 25 • ¼ x 24 = 6 • 4/5 of 40 = 32 • 2/3 x 30 = 20 • 1/6 x 18 = 3

  6. The diagram best represents what percent shaded? 30%, 50% or 70% The diagram best represents what percent shaded? 30%, 50% or 70% Mental Math # 3

  7. 3) The diagram best represents what percent shaded? 30%, 50% or 70% 4) The diagram best represents what percent shaded? 25%, 50% or 75%

  8. 5) The diagram best represents what percent shaded? 38%, 50% or 66% 6) The diagram best represents what percent shaded? 33%, 53% or 73%

  9. 7) The diagram best represents what percent shaded? 30%, 50% or 70% 8) The diagram best represents what percent shaded? 20%, 40% or 60%

  10. 9) The diagram best represents what percent shaded? 25%, 50% or 75% 10) The diagram best represents what percent shaded? 25%, 50% or 75%

  11. The diagram best represents what percent shaded? 30%, 50% or 70% The diagram best represents what percent shaded? 30%, 50% or 70% Mental Math # 3

  12. 3) The diagram best represents what percent shaded? 30%, 50% or 70% 4) The diagram best represents what percent shaded? 25%, 50% or 75%

  13. 5) The diagram best represents what percent shaded? 38%, 50% or 66% 6) The diagram best represents what percent shaded? 33%, 53% or 73%

  14. 7) The diagram best represents what percent shaded? 30%, 50% or 70% 8) The diagram best represents what percent shaded? 20%, 40% or 60%

  15. 9) The diagram best represents what percent shaded? 25%, 50% or 75% 10) The diagram best represents what percent shaded? 25%, 50% or 75%

  16. Mental Math # 4Write a ratio that compares the number of: 1) brown eggs to white eggs 2) cracked eggs to eggs not cracked 3) white eggs to the number of eggs 4) cracked white eggs to the amount of white eggs 5) eggs to cracked eggs

  17. Mental Math # 4Write a ratio that compares the number of: 6) cracked brown eggs to cracked white eggs 7) Brown eggs to the number of eggs 8) cracked brown to brown not cracked 9) white eggs to brown eggs 10) brown eggs not cracked to white eggs not cracked

  18. Mental Math # 4Write a ratio that compares the number of: 1) brown eggs to white eggs 4:8 2) cracked eggs to eggs not cracked 3:9 3) white eggs to the number of eggs 8:12 4) cracked white eggs to the amount of white eggs 1:8 5) eggs to cracked eggs 12:3

  19. Mental Math # 4Write a ratio that compares the number of: 6) cracked brown to cracked white eggs 2:1 7) brown eggs to the number of eggs 4:12 8) cracked brown to brown not cracked 2:2 9) white eggs to brown eggs 8:4 10) brown eggs not cracked to white eggs not cracked 2:7

  20. Mental Math # 5 • Double the sum of 100 and 150 = • 7 x 103 + 8 x 101 = • -10 - -2 = • 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 =

  21. Mental Math # 5 • Double the sum of 100 and 150 = 500 • 7 x 103 + 8 x 101 = 7080 • -10 - -2 = -8 • 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

  22. Mental Math # 6 • 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? 5) 6000 + 70 000 + 49 = 6) Multiple 100 groups of 47 = 7) The quotient of 50 and 10 = 8) Nine squared = 9) 760  102 = 10) 5 x 103 =

  23. Mental Math # 6 • 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

  24. Mental Math # 7 • Double 2000 added to 342 = • 780 000 in scientific notation = • 100.3 x 2 = • You spend $50.90 You have $100.00. What is your change? • Half of 612 = • Multiple 200 groups of 70 = • $6.27 x 100 = • The sum of ten squared and five squared = • 715  5 = • 8 groups of 102 =

  25. Mental Math # 7 • Double 2000 added to 342 = 4342 • 780 000 in scientific notation = 7.8 x 105 • 100.3 x 2 = 200.6 • You spend $50.90 You have $100.00. What is your change? $49.10 • Half of 612 = 306 • Multiple 200 groups of 70 = 14 000 • $6.27 x 100 = $627 • The sum of ten squared and five squared = 125 • 715  5 = 143 • 8 groups of 102 = 800

  26. Mental Math # 8 • 2 x 8 x 5 = • 25 x 22 x 4 = • 2 x 9 x 50 = • 4 x 6 x 5 = • 10 x 4 x 9 x 10 = • 2 x 50 x 2 x 7 = • 2 x 9 x 5 x 2 = • 2 x 4 x 5 x 11 = • 7 x 3 x 5 x 20 = • 2 x 25 x 50 =

  27. Mental Math # 8 • 2 x 8 x 5 = 80 • 25 x 22 x 4 = 2200 • 2 x 9 x 50 = 900 • 4 x 6 x 5 = 120 • 10 x 4 x 9 x 10 = 3600 • 2 x 50 x 2 x 7 = 1400 • 2 x 9 x 5 x 2 = 180 • 2 x 4 x 5 x 11 = 440 • 7 x 3 x 5 x 20 = 2100 • 2 x 25 x 50 = 2500

  28. Mental Math # 9 • 4 x 52 x 25 = • 3 x 4 x 5 x 6 = • 2 x 3 x 50 = • 2 x 6 x 500 = • 10 x 40 x 2 = • 20 x 5 x 7 x 2 = • 2 x 9 x 5 x 2 = • 2 x 4 x 25 x 11 = • 2 x 2 x 5 x 20 = • 2 x 9 x 4 x 5 x 0 =

  29. Mental Math # 9 • 4 x 52 x 25 = 5200 • 3 x 4 x 5 x 6 = 360 • 2 x 3 x 50 = 300 • 2 x 6 x 500 = 6000 • 10 x 40 x 2 = 800 • 20 x 5 x 7 x 2 = 1400 • 2 x 9 x 5 x 2 = 180 • 2 x 4 x 25 x 11 = 2200 • 2 x 2 x 5 x 20 = 400 • 2 x 9 x 4 x 5 x 0 = 0

  30. Mental Math # 10 • 6 x 15 x 2 = • 3 x 5 x 5 x 2 = • 4 x 5 x 25 x 4 = • 50 x 6 x 2 x 6 = • 50 x 4 x 12 = • 2 x 5 x 7 x 2 = • 20 x 13 x 5 = • 4 x 25 x 56 = • 9 x 2 x 50 x 9 = • 2 x 6 x 4 x 5 =

  31. Mental Math # 10 • 6 x 15 x 2 = 180 • 3 x 5 x 5 x 2 = 150 • 4 x 5 x 25 x 4 = 2000 • 50 x 6 x 2 x 6 = 3600 • 50 x 4 x 12 = 2400 • 2 x 5 x 7 x 2 = 140 • 20 x 13 x 5 = 1300 • 4 x 25 x 56 = 5600 • 9 x 2 x 50 x 9 = 8100 • 2 x 6 x 4 x 5 = 240

  32. Mental Math # 11 • Three groups of one hundred increased by two hundred forty two = • 640.01 in scientific notation = • 200.15 + 500.03 = • You spend $36.05 You have two $20 bills. What is your change? • Half of 584 = • Multiple 35 groups of 200 = • 3.4 x 100 = • Sum of ten squared and four squared = • -7 - +2 = • 79 x 102 =

  33. Mental Math # 11 • Three groups of one hundred increased by two hundred forty two = 542 • 640.01 in scientific notation = 6.4001 x 102 • 200.15 + 500.03 = 700.18 • You spend $36.05 You have two $20 bills. What is your change? $3.95 • Half of 584 = 292 • Multiple 35 groups of 200 = 7000 • 3.4 x 100 = 340 • Sum of ten squared and four squared = 116 • -7 - +2 = -9 • 79 x 102 = 7900

  34. Mental Math # 12 • Three groups of two hundred decreased by one hundred = • 47 000 in scientific notation = • 40.1 + 30.22 = • You spend $24.50 You have a $50 bill. What is your change? • Half of 876 = • Multiple 3 groups of 500 = • 45 x 1000 = • Sum of three squared and five squared = • +5 + -7 = • 9 x 103 =

  35. Mental Math # 12 • Three groups of two hundred decreased by one hundred = 500 • 47 000 in scientific notation = 4.7 x 104 • 40.1 + 30.22 = 70.32 • You spend $24.50 You have a $50 bill. What is your change? $25.50 • Half of 876 = 438 • Multiple 3 groups of 500 = 1500 • 45 x 1000 = 45 000 • Sum of three squared and five squared = 34 • +5 + -7 = -2 • 9 x 103 = 9000

  36. Mental Math # 13 • Four groups of twenty decreased by one group of ten = • 27O 000 in scientific notation = • 4.1 + 3.9 + 6.5 = • You spend $45.00 You have three $20 bills. What is your change? • Half of 706 = • Multiple 3 groups of 800 = • 5 x 1000 + 3 x 100 = • Sum of three squared and ten squared = • (-5) – (-7) = • 5 x 103 =

  37. Mental Math # 13 • Four groups of twenty decreased by one group of ten = 70 • 27O 000 in scientific notation = 2.7 x 105 • 4.1 + 3.9 + 6.5 = 14.5 • You spend $45.00 You have three $20 bills. What is your change? $15.00 • Half of 706 = 353 • Multiple 3 groups of 800 = 2400 • 5 x 1000 + 3 x 100 = 5300 • Sum of three squared and ten squared = 109 • (-5) – (-7) = +2 • 5 x 103 = 5000

  38. Mental Math # 14 • 4.6 + ___ = 10 • 2.7 + ___ = 10 • ___ + $3.90 = $10.00 • $45.00 + ___ =$100.00 • 0.25 + ___ = 1 • $69.00 + ___ = $100 • $0.51 + ___ = $1.00 • ___ + $0.73 = $1.00 • $0.50 + ___ = $2.00 • ___ + 3.7 = 5

  39. Mental Math # 14 • 4.6 + 5.4 = 10 • 2.7 + 7.3 = 10 • $6.10 + $3.90 = $10.00 • $45.00 + $55.00 =$100.00 • 0.25 + 0.75 = 1 • $69.00 + $31.00 = $100 • $0.51 + $0.49 = $1.00 • $0.27 + $0.73 = $1.00 • $0.50 + $1.50 = $2.00 • 1.3 + 3.7 = 5

  40. Mental Math # 15 • 0.08 + ___ = 1 • $2.75 + ___ = $10.00 • ___ + $2.80 = $5.00 • 4.4 + ___ = 10 • 0.05 + ___ = 1 • ___ + $3.70 = $10.00 • 4.01 + ___ = 5 • ___ + $80.70 = $100.00 • $0.90 + ___ = $2.00 • ___ + 3.5 = 5

  41. Mental Math # 15 • 0.08 + 0.92 = 1 • $2.75 + 7.25 = $10.00 • $2.20 + $2.80 = $5.00 • 4.4 + 5.6 = 10 • 0.05 + 0.95 = 1 • $6.30 + $3.70 = $10.00 • 4.01 + 0.99 = 5 • $19.30 + $80.70 = $100.00 • $0.90 + $1.10 = $2.00 • 1.5 + 3.5 = 5

  42. Mental Math # 16 • From 8:00 A.M. to 11:30 A.M. = • From 6:10 P.M. to 8:30 P.M. = • From 4:40 A.M. to 9:50 A.M. = • From 1:00 A.M. to 2:30 A.M. = • From 3:10 P.M. to 11:20 P.M. = • From 9:45 P.M. to 11:50 P.M. = • From 5:00 A.M. to 5:40 A.M. = • From 2:25 A.M. to 6:30 A.M. = • From 5:30 P.M. to 9:30 P.M. = • From 8:10 A.M. to 10:30 P.M. =

  43. Mental Math # 16 • From 8:00 A.M. to 11:30 A.M. = 3 hr 30 min • From 6:10 P.M. to 8:30 P.M. = 2 hr 20 min • From 4:40 A.M. to 9:50 A.M. = 5 hr 10 min • From 1:00 A.M. to 2:30 A.M. = 1 hr 30 min • From 3:10 P.M. to 11:20 P.M. = 8 hr 10 min • From 9:45 P.M. to 11:50 P.M. =2 hr 5 min • From 5:00 A.M. to 5:40 A.M. = 40 min • From 2:25 A.M. to 6:30 A.M. = 4 hr 5 min • From 5:30 P.M. to 7:20 P.M. = 1 hr 50 min • From 8:10 A.M. to 10:30 P.M. = 14 hr 20 min

  44. Mental Math # 17 • From 2:30 A.M. to 4:10 A.M. = • From 6:10 P.M. to 8:10 P.M. = • From 8:40 A.M. to 9:50 A.M. = • From 12:00 A.M. to 2:50 A.M. = • From 7:10 P.M. to 11:20 P.M. = • From 9:25 P.M. to 9:50 P.M. = • From 5:40 A.M. to 7:0 A.M. = • From 6:25 A.M. to 10:00 A.M. = • From 5:30 P.M. to 7:40 P.M. = • From 4:00 A.M. to 3:30 P.M. =

  45. Mental Math # 17 • From 2:30 A.M. to 4:10 A.M. = 1 hr 40 min • From 6:10 P.M. to 8:10 P.M. = 2 hr • From 8:40 A.M. to 9:50 A.M. = 1 hr 10 min • From 12:00 A.M. to 2:50 A.M. = 2 hr 50 min • From 7:10 P.M. to 11:20 P.M. = 4 hr 10 min • From 9:25 P.M. to 9:50 P.M. = 25 min • From 5:40 A.M. to 7:0 A.M. = 1 hr 20 min • From 6:25 A.M. to 10:00 A.M. = 3 hr 35 min • From 5:30 P.M. to 7:40 P.M. = 2 hr 10 min • From 4:00 A.M. to 3:30 P.M. = 11 hr 30 min

  46. Mental Math # 18 1)

  47. Mental Math # 18 2)

  48. Mental Math # 18 3)

  49. Mental Math # 18 4)

  50. Mental Math # 18 5)

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