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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 700 · 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. 1.1.5 × 7 — where does the decimal point go? (a) 1.05 (b) 0.105 (c) 105 (d) 10.5
  2. 2.0.82 × 0.6 — where does the decimal point go? (a) 0.492 (b) 0.0492 (c) 4.92 (d) 0.00492
  3. 3.5.8 × 2.3 — where does the decimal point go? (a) 13.34 (b) 133.4 (c) 0.1334 (d) 1.334
  4. 4.0.69 × 3.7 — where does the decimal point go? (a) 2.553 (b) 0.02553 (c) 25.53 (d) 0.2553
  5. 5.7.3 × 8 — where does the decimal point go? (a) 584 (b) 0.584 (c) 58.4 (d) 5.84
  6. 6.0.57 × 4 — where does the decimal point go? (a) 22.8 (b) 0.228 (c) 0.0228 (d) 2.28
  7. 7.0.36 × 7 — where does the decimal point go? (a) 0.252 (b) 25.2 (c) 0.0252 (d) 2.52
  8. 8.2.8 × 1.1 — where does the decimal point go? (a) 0.308 (b) 0.0308 (c) 30.8 (d) 3.08
  9. 9.8.6 × 14 — where does the decimal point go? (a) 12.04 (b) 1.204 (c) 120.4 (d) 1204
  10. 10.4.4 × 3 — where does the decimal point go? (a) 132 (b) 1.32 (c) 0.132 (d) 13.2
  11. 11.9.8 × 7 — where does the decimal point go? (a) 6.86 (b) 68.6 (c) 0.686 (d) 686
  12. 12.8.5 × 2.5 — where does the decimal point go? (a) 0.2125 (b) 2.125 (c) 212.5 (d) 21.25
  13. 13.0.46 × 3 — where does the decimal point go? (a) 0.0138 (b) 13.8 (c) 1.38 (d) 0.138
  14. 14.0.73 × 0.6 — where does the decimal point go? (a) 0.0438 (b) 0.00438 (c) 4.38 (d) 0.438
  15. 15.6.5 × 9 — where does the decimal point go? (a) 5.85 (b) 58.5 (c) 585 (d) 0.585
  16. 16.2.1 × 22 — where does the decimal point go? (a) 0.462 (b) 4.62 (c) 462 (d) 46.2
  17. 17.8.4 × 0.8 — where does the decimal point go? (a) 67.2 (b) 0.0672 (c) 0.672 (d) 6.72
  18. 18.2.8 × 21 — where does the decimal point go? (a) 5.88 (b) 588 (c) 0.588 (d) 58.8
  19. 19.6.8 × 1.6 — where does the decimal point go? (a) 1.088 (b) 10.88 (c) 0.1088 (d) 108.8
  20. 20.0.82 × 2.7 — where does the decimal point go? (a) 2.214 (b) 0.02214 (c) 0.2214 (d) 22.14
  21. 21.9.8 × 8 — where does the decimal point go? (a) 0.784 (b) 7.84 (c) 784 (d) 78.4
  22. 22.1.4 × 21 — where does the decimal point go? (a) 294 (b) 29.4 (c) 0.294 (d) 2.94
  23. 23.0.99 × 1.1 — where does the decimal point go? (a) 10.89 (b) 0.01089 (c) 1.089 (d) 0.1089
  24. 24.0.19 × 1.3 — where does the decimal point go? (a) 2.47 (b) 0.247 (c) 0.0247 (d) 0.00247
  25. 25.5.1 × 22 — where does the decimal point go? (a) 1.122 (b) 1122 (c) 112.2 (d) 11.22
  26. 26.0.13 × 43 — where does the decimal point go? (a) 5.59 (b) 55.9 (c) 0.0559 (d) 0.559
  27. 27.6.9 × 0.5 — where does the decimal point go? (a) 3.45 (b) 0.345 (c) 0.0345 (d) 34.5
  28. 28.7.9 × 0.9 — where does the decimal point go? (a) 0.0711 (b) 0.711 (c) 7.11 (d) 71.1
  29. 29.0.34 × 6 — where does the decimal point go? (a) 2.04 (b) 0.204 (c) 20.4 (d) 0.0204
  30. 30.0.79 × 0.8 — where does the decimal point go? (a) 6.32 (b) 0.0632 (c) 0.632 (d) 0.00632
  31. 31.0.49 × 0.2 — where does the decimal point go? (a) 0.098 (b) 0.98 (c) 0.0098 (d) 0.00098
  32. 32.0.87 × 3.8 — where does the decimal point go? (a) 3.306 (b) 33.06 (c) 0.3306 (d) 0.03306
  33. 33.3.9 × 27 — where does the decimal point go? (a) 1.053 (b) 105.3 (c) 1053 (d) 10.53
  34. 34.0.73 × 0.5 — where does the decimal point go? (a) 0.00365 (b) 3.65 (c) 0.0365 (d) 0.365
  35. 35.2.4 × 14 — where does the decimal point go? (a) 0.336 (b) 336 (c) 33.6 (d) 3.36
  36. 36.0.54 × 7 — where does the decimal point go? (a) 0.0378 (b) 0.378 (c) 3.78 (d) 37.8
  37. 37.6.9 × 0.2 — where does the decimal point go? (a) 0.138 (b) 13.8 (c) 1.38 (d) 0.0138
  38. 38.1.2 × 47 — where does the decimal point go? (a) 0.564 (b) 56.4 (c) 564 (d) 5.64
  39. 39.3.5 × 0.5 — where does the decimal point go? (a) 0.175 (b) 0.0175 (c) 1.75 (d) 17.5
  40. 40.0.63 × 3 — where does the decimal point go? (a) 18.9 (b) 0.189 (c) 1.89 (d) 0.0189

Answer key

  1. 10.5
  2. 0.492
  3. 13.34
  4. 2.553
  5. 58.4
  6. 2.28
  7. 2.52
  8. 3.08
  9. 120.4
  10. 13.2
  11. 68.6
  12. 21.25
  13. 1.38
  14. 0.438
  15. 58.5
  16. 46.2
  17. 6.72
  18. 58.8
  19. 10.88
  20. 2.214
  21. 78.4
  22. 29.4
  23. 1.089
  24. 0.247
  25. 112.2
  26. 5.59
  27. 3.45
  28. 7.11
  29. 2.04
  30. 0.632
  31. 0.098
  32. 3.306
  33. 105.3
  34. 0.365
  35. 33.6
  36. 3.78
  37. 1.38
  38. 56.4
  39. 1.75
  40. 1.89

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