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Decimal Numbers

Decimal Numbers. Multiplying by 10, 100, 1000. Dividing by 10, 100, 1000. Multiplying by a single Digit. www.mathsrevision.com. Dividing by a single Digit. Mixed Questions. Starter Questions. 40 o. www.mathsrevision.com. Decimal Numbers. Learning Intention. Success Criteria.

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Decimal Numbers

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  1. Decimal Numbers Multiplying by 10, 100, 1000 Dividing by 10, 100, 1000 Multiplying by a single Digit www.mathsrevision.com Dividing by a single Digit Mixed Questions Created by Mr. Lafferty Maths Dept.

  2. Starter Questions 40o www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  3. Decimal Numbers Learning Intention Success Criteria • Understand the simple rules to multiply decimal numbers. • 1 We are learning how to multiply decimal numbers by 10, 100, 1000. www.mathsrevision.com • 2. Be able do calculations. Created by Mr. Lafferty Maths Dept.

  4. Decimal Numbers Multiplying by 10, 100, 1000 To multiply a decimal number by 10, Simply move point 1 place to the right: e.g. 2.55 x 10 = 25.5 point is moved 1 place to right To multiply a decimal number by 100, Simply move point 2 places to the right: www.mathsrevision.com e.g. 1.02 x 100 = 102 point is moved 2 places to right Created by Mr. Lafferty Maths Dept.

  5. Decimal Numbers Multiplying by 10, 100, 1000 To multiply a decimal number by 1000, Simply move point 3 places to the right: e.g. 34.567 x 1000 = 34 567 point is moved 3 place to right www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  6. Decimal Numbers Multiplying by 10, 100, 1000 Example : Multiply 1.8574 by 10, 100, 1000 10 x 1.8574 = 18.574 100 x 1.8574 = 185.74 www.mathsrevision.com 1000 x 1.8574 = 1857.4 Created by Mr. Lafferty Maths Dept.

  7. Decimal Numbers Now try TJ2a Ex 1 Ch7 (page 62) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  8. Starter Questions www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  9. Decimal Numbers Learning Intention Success Criteria • Understand the simple rules to divide decimal numbers. • 1 We are learning how to divide decimal numbers by 10, 100, 1000. www.mathsrevision.com • 2. Be able do calculations. Created by Mr. Lafferty Maths Dept.

  10. Decimal Numbers Dividing by 10, 100, 1000 To divide a decimal number by 10, Simply move point 1 place to the left: e.g. 89 ÷ 10 = 8.9 point is moved 1 place to left To divide a decimal number by 100, Simply move point 2 places to the left: www.mathsrevision.com e.g. 199 ÷ 100 = 1.99 point is moved 2 places to left Created by Mr. Lafferty Maths Dept.

  11. Decimal Numbers Dividing by 10, 100, 1000 To divide a decimal number by 1000, Simply move point 3 places to the left: e.g. 35 837 ÷ 1000 = 35.837 point is moved 3 places to the left www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  12. Decimal Numbers Dividing by 10, 100, 1000 Example : Divide 45 024 by 10, 100, 1000 45 024 ÷ 10 = 4502.4 45 024 ÷ 100 = 450.24 www.mathsrevision.com 45 024 ÷ 1000 = 45.024 Created by Mr. Lafferty Maths Dept.

  13. Decimal Numbers Now try TJ2a Ex 2 Ch7 (page 63) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  14. Starter Questions www.mathsrevision.com 57o Created by Mr. Lafferty Maths Dept.

  15. Decimal Numbers Learning Intention Success Criteria 1. Understand how to multiply a decimal number by a single Digit. • 1. We are learning how to multiply a decimal number by a single Digit. www.mathsrevision.com 2. Show appropriate working. Created by Mr. Lafferty Maths Dept.

  16. Decimal Numbers When multiplying by a single digit the decimal point always stays in line. Example : Calculate 23.68 x 7 www.mathsrevision.com 1 6 5 . 7 6 Created by Mr. Lafferty Maths Dept.

  17. Decimal Numbers Multiplication & Division by a Single Digit Example : Copy and complete. 3.5 x 6 18.43 x 4 76.97 x 6 www.mathsrevision.com 1 2 1 . 0 7 3 . 7 2 4 6 1 . 8 2 Created by Mr. Lafferty Maths Dept.

  18. Decimal Numbers Now try TJ2a Ex 3 Ch7 (page 64) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  19. Starter Questions www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  20. Decimal Numbers Learning Intention Success Criteria 1. Understand how to divide a decimal number by a single Digit. • 1. We are learning how to divide a decimal number by a single Digit. www.mathsrevision.com 2. Show appropriate working. Created by Mr. Lafferty Maths Dept.

  21. Decimal Numbers When dividing by a single digit the decimal point always stays in line. Example : Calculate 17.16 ÷ 6 www.mathsrevision.com 2 . 8 6 Created by Mr. Lafferty Maths Dept.

  22. Decimal Numbers Multiplication & Division by a Single Digit Example : Copy and complete. 6.52 ÷ 2 95.05 ÷ 5 204.84 ÷ 6 3 . 2 6 3 4 . 1 4 1 9 . 0 1 www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  23. Decimal Numbers Now try TJ2a Ex 4 Ch7 (page 65) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

  24. 4 1 2 . 1 6 2 3 1 6 . 8 6 . 5 2 3 6 8 . 5 . 1 . 2 5 9 1 3 . 0 8 - + 0 . 3 5 . 4 x 3 9 3 1 4 1 .moves to the left number gets smaller Decimal Number Layout IMPORTANT Look at 2nd decimal place 10, 100 , 1000 Rounding 39 ÷ 10 10, 100 , 1000 3.65478 to 1 decimal place .moves to the RIGHT number gets BIGGER 4 6 4 8 . = 3.9 If ≥ to 5 increase 1st decimal place by one otherwise it stays the same 3.7 2.45 x 100 = 245

  25. Have you updated your Learning Log ? Decimal Numbers Now try TJ2a Ex 5 Ch7 (page 66) www.mathsrevision.com Are you on Target ? I can ? Created by Mr. Lafferty Maths Dept.

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