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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 359 · 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. 1.0.21 × 25 — where does the decimal point go? (a) 52.5 (b) 5.25 (c) 0.0525 (d) 0.525
  2. 2.2.2 × 6 — where does the decimal point go? (a) 0.132 (b) 1.32 (c) 132 (d) 13.2
  3. 3.6.7 × 46 — where does the decimal point go? (a) 30.82 (b) 3.082 (c) 3082 (d) 308.2
  4. 4.1.7 × 1.9 — where does the decimal point go? (a) 3.23 (b) 0.323 (c) 0.0323 (d) 32.3
  5. 5.0.22 × 12 — where does the decimal point go? (a) 2.64 (b) 0.264 (c) 26.4 (d) 0.0264
  6. 6.0.39 × 8 — where does the decimal point go? (a) 0.0312 (b) 0.312 (c) 31.2 (d) 3.12
  7. 7.2.5 × 33 — where does the decimal point go? (a) 82.5 (b) 0.825 (c) 8.25 (d) 825
  8. 8.0.28 × 8 — where does the decimal point go? (a) 0.0224 (b) 0.224 (c) 22.4 (d) 2.24
  9. 9.0.67 × 33 — where does the decimal point go? (a) 221.1 (b) 0.2211 (c) 2.211 (d) 22.11
  10. 10.6.1 × 0.4 — where does the decimal point go? (a) 0.244 (b) 2.44 (c) 0.0244 (d) 24.4
  11. 11.0.31 × 28 — where does the decimal point go? (a) 0.868 (b) 0.0868 (c) 8.68 (d) 86.8
  12. 12.0.86 × 38 — where does the decimal point go? (a) 0.3268 (b) 326.8 (c) 3.268 (d) 32.68
  13. 13.0.82 × 4 — where does the decimal point go? (a) 0.0328 (b) 3.28 (c) 32.8 (d) 0.328
  14. 14.0.87 × 44 — where does the decimal point go? (a) 382.8 (b) 0.3828 (c) 3.828 (d) 38.28
  15. 15.6.8 × 0.7 — where does the decimal point go? (a) 0.476 (b) 4.76 (c) 0.0476 (d) 47.6
  16. 16.0.45 × 0.7 — where does the decimal point go? (a) 0.00315 (b) 3.15 (c) 0.315 (d) 0.0315
  17. 17.0.29 × 0.9 — where does the decimal point go? (a) 2.61 (b) 0.261 (c) 0.0261 (d) 0.00261
  18. 18.8.5 × 2.1 — where does the decimal point go? (a) 0.1785 (b) 178.5 (c) 17.85 (d) 1.785
  19. 19.2.7 × 25 — where does the decimal point go? (a) 675 (b) 67.5 (c) 6.75 (d) 0.675
  20. 20.7.6 × 0.7 — where does the decimal point go? (a) 0.0532 (b) 0.532 (c) 5.32 (d) 53.2
  21. 21.7.3 × 5 — where does the decimal point go? (a) 0.365 (b) 36.5 (c) 3.65 (d) 365
  22. 22.0.58 × 11 — where does the decimal point go? (a) 0.638 (b) 0.0638 (c) 63.8 (d) 6.38
  23. 23.0.99 × 1.8 — where does the decimal point go? (a) 1.782 (b) 17.82 (c) 0.01782 (d) 0.1782
  24. 24.8.8 × 8 — where does the decimal point go? (a) 70.4 (b) 0.704 (c) 704 (d) 7.04
  25. 25.0.31 × 0.4 — where does the decimal point go? (a) 0.124 (b) 0.0124 (c) 0.00124 (d) 1.24
  26. 26.6.2 × 3.4 — where does the decimal point go? (a) 0.2108 (b) 210.8 (c) 21.08 (d) 2.108
  27. 27.0.51 × 7 — where does the decimal point go? (a) 0.357 (b) 0.0357 (c) 3.57 (d) 35.7
  28. 28.3.4 × 2.7 — where does the decimal point go? (a) 91.8 (b) 9.18 (c) 0.0918 (d) 0.918
  29. 29.6.4 × 2.1 — where does the decimal point go? (a) 13.44 (b) 134.4 (c) 1.344 (d) 0.1344
  30. 30.0.37 × 1.6 — where does the decimal point go? (a) 5.92 (b) 0.592 (c) 0.0592 (d) 0.00592
  31. 31.2.8 × 0.3 — where does the decimal point go? (a) 0.084 (b) 0.84 (c) 0.0084 (d) 8.4
  32. 32.9.7 × 0.2 — where does the decimal point go? (a) 19.4 (b) 0.194 (c) 0.0194 (d) 1.94
  33. 33.0.53 × 0.4 — where does the decimal point go? (a) 0.00212 (b) 0.212 (c) 2.12 (d) 0.0212
  34. 34.0.39 × 0.3 — where does the decimal point go? (a) 0.117 (b) 0.0117 (c) 1.17 (d) 0.00117
  35. 35.8.3 × 1.7 — where does the decimal point go? (a) 1.411 (b) 0.1411 (c) 141.1 (d) 14.11
  36. 36.9.9 × 9 — where does the decimal point go? (a) 0.891 (b) 891 (c) 8.91 (d) 89.1
  37. 37.8.3 × 5 — where does the decimal point go? (a) 0.415 (b) 4.15 (c) 415 (d) 41.5
  38. 38.0.71 × 3 — where does the decimal point go? (a) 0.213 (b) 2.13 (c) 0.0213 (d) 21.3
  39. 39.9.7 × 7 — where does the decimal point go? (a) 6.79 (b) 0.679 (c) 679 (d) 67.9
  40. 40.9.1 × 2.3 — where does the decimal point go? (a) 209.3 (b) 20.93 (c) 2.093 (d) 0.2093

Answer key

  1. 5.25
  2. 13.2
  3. 308.2
  4. 3.23
  5. 2.64
  6. 3.12
  7. 82.5
  8. 2.24
  9. 22.11
  10. 2.44
  11. 8.68
  12. 32.68
  13. 3.28
  14. 38.28
  15. 4.76
  16. 0.315
  17. 0.261
  18. 17.85
  19. 67.5
  20. 5.32
  21. 36.5
  22. 6.38
  23. 1.782
  24. 70.4
  25. 0.124
  26. 21.08
  27. 3.57
  28. 9.18
  29. 13.44
  30. 0.592
  31. 0.84
  32. 1.94
  33. 0.212
  34. 0.117
  35. 14.11
  36. 89.1
  37. 41.5
  38. 2.13
  39. 67.9
  40. 20.93

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