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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 754 · 40 questions
TalentJR

The trick (Count the places): Forget the points and multiply the whole numbers. Count all the digits after the points in the question. Put the point that many places from the right, then check by rounding.

NameDateTime takenScore ___ / 40
  1. 1.6.3 × 0.7 — where does the decimal point go? (a) 0.0441 (b) 44.1 (c) 4.41 (d) 0.441
  2. 2.1.7 × 13 — where does the decimal point go? (a) 22.1 (b) 221 (c) 0.221 (d) 2.21
  3. 3.7.8 × 0.8 — where does the decimal point go? (a) 62.4 (b) 6.24 (c) 0.0624 (d) 0.624
  4. 4.4.2 × 36 — where does the decimal point go? (a) 1512 (b) 1.512 (c) 151.2 (d) 15.12
  5. 5.8.4 × 29 — where does the decimal point go? (a) 24.36 (b) 2.436 (c) 2436 (d) 243.6
  6. 6.9.9 × 0.8 — where does the decimal point go? (a) 0.0792 (b) 0.792 (c) 79.2 (d) 7.92
  7. 7.0.93 × 3 — where does the decimal point go? (a) 2.79 (b) 27.9 (c) 0.0279 (d) 0.279
  8. 8.6.4 × 2 — where does the decimal point go? (a) 1.28 (b) 12.8 (c) 0.128 (d) 128
  9. 9.6.8 × 7 — where does the decimal point go? (a) 0.476 (b) 4.76 (c) 476 (d) 47.6
  10. 10.1.2 × 6 — where does the decimal point go? (a) 72 (b) 0.72 (c) 7.2 (d) 0.072
  11. 11.3.3 × 6 — where does the decimal point go? (a) 1.98 (b) 198 (c) 0.198 (d) 19.8
  12. 12.4.8 × 7 — where does the decimal point go? (a) 3.36 (b) 0.336 (c) 336 (d) 33.6
  13. 13.3.9 × 18 — where does the decimal point go? (a) 702 (b) 0.702 (c) 7.02 (d) 70.2
  14. 14.6.9 × 47 — where does the decimal point go? (a) 32.43 (b) 3243 (c) 324.3 (d) 3.243
  15. 15.0.28 × 0.2 — where does the decimal point go? (a) 0.0056 (b) 0.56 (c) 0.056 (d) 0.00056
  16. 16.1.4 × 0.8 — where does the decimal point go? (a) 1.12 (b) 0.112 (c) 0.0112 (d) 11.2
  17. 17.0.12 × 0.3 — where does the decimal point go? (a) 0.36 (b) 0.036 (c) 0.0036 (d) 0.00036
  18. 18.3.9 × 17 — where does the decimal point go? (a) 66.3 (b) 663 (c) 0.663 (d) 6.63
  19. 19.7.6 × 42 — where does the decimal point go? (a) 3192 (b) 319.2 (c) 3.192 (d) 31.92
  20. 20.2.2 × 38 — where does the decimal point go? (a) 83.6 (b) 836 (c) 8.36 (d) 0.836
  21. 21.0.21 × 4.1 — where does the decimal point go? (a) 0.0861 (b) 8.61 (c) 0.861 (d) 0.00861
  22. 22.0.91 × 5 — where does the decimal point go? (a) 4.55 (b) 45.5 (c) 0.455 (d) 0.0455
  23. 23.0.82 × 9 — where does the decimal point go? (a) 7.38 (b) 0.0738 (c) 73.8 (d) 0.738
  24. 24.0.16 × 2 — where does the decimal point go? (a) 0.032 (b) 0.0032 (c) 3.2 (d) 0.32
  25. 25.8.8 × 14 — where does the decimal point go? (a) 1.232 (b) 1232 (c) 123.2 (d) 12.32
  26. 26.1.2 × 8 — where does the decimal point go? (a) 9.6 (b) 0.96 (c) 0.096 (d) 96
  27. 27.4.7 × 0.8 — where does the decimal point go? (a) 0.376 (b) 0.0376 (c) 3.76 (d) 37.6
  28. 28.3.4 × 32 — where does the decimal point go? (a) 1.088 (b) 108.8 (c) 1088 (d) 10.88
  29. 29.5.1 × 17 — where does the decimal point go? (a) 867 (b) 0.867 (c) 8.67 (d) 86.7
  30. 30.3.1 × 1.3 — where does the decimal point go? (a) 4.03 (b) 0.403 (c) 0.0403 (d) 40.3
  31. 31.8.9 × 0.4 — where does the decimal point go? (a) 35.6 (b) 0.0356 (c) 0.356 (d) 3.56
  32. 32.3.7 × 36 — where does the decimal point go? (a) 133.2 (b) 1332 (c) 1.332 (d) 13.32
  33. 33.4.8 × 1.3 — where does the decimal point go? (a) 0.0624 (b) 0.624 (c) 62.4 (d) 6.24
  34. 34.0.32 × 0.8 — where does the decimal point go? (a) 0.256 (b) 2.56 (c) 0.0256 (d) 0.00256
  35. 35.8.4 × 0.3 — where does the decimal point go? (a) 0.0252 (b) 0.252 (c) 25.2 (d) 2.52
  36. 36.8.8 × 2.4 — where does the decimal point go? (a) 211.2 (b) 2.112 (c) 0.2112 (d) 21.12
  37. 37.0.44 × 7 — where does the decimal point go? (a) 3.08 (b) 0.308 (c) 30.8 (d) 0.0308
  38. 38.5.9 × 0.2 — where does the decimal point go? (a) 0.0118 (b) 0.118 (c) 1.18 (d) 11.8
  39. 39.0.18 × 7 — where does the decimal point go? (a) 1.26 (b) 0.126 (c) 12.6 (d) 0.0126
  40. 40.0.29 × 1.5 — where does the decimal point go? (a) 0.435 (b) 0.00435 (c) 0.0435 (d) 4.35

Answer key

  1. 4.41
  2. 22.1
  3. 6.24
  4. 151.2
  5. 243.6
  6. 7.92
  7. 2.79
  8. 12.8
  9. 47.6
  10. 7.2
  11. 19.8
  12. 33.6
  13. 70.2
  14. 324.3
  15. 0.056
  16. 1.12
  17. 0.036
  18. 66.3
  19. 319.2
  20. 83.6
  21. 0.861
  22. 4.55
  23. 7.38
  24. 0.32
  25. 123.2
  26. 9.6
  27. 3.76
  28. 108.8
  29. 86.7
  30. 4.03
  31. 3.56
  32. 133.2
  33. 6.24
  34. 0.256
  35. 2.52
  36. 21.12
  37. 3.08
  38. 1.18
  39. 1.26
  40. 0.435

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