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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 527 · 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. 1.9.7 × 6 — where does the decimal point go? (a) 58.2 (b) 582 (c) 5.82 (d) 0.582
  2. 2.0.27 × 0.7 — where does the decimal point go? (a) 1.89 (b) 0.0189 (c) 0.189 (d) 0.00189
  3. 3.6.3 × 0.8 — where does the decimal point go? (a) 0.504 (b) 5.04 (c) 50.4 (d) 0.0504
  4. 4.9.6 × 0.6 — where does the decimal point go? (a) 0.0576 (b) 0.576 (c) 57.6 (d) 5.76
  5. 5.0.82 × 41 — where does the decimal point go? (a) 3.362 (b) 33.62 (c) 0.3362 (d) 336.2
  6. 6.0.67 × 28 — where does the decimal point go? (a) 1.876 (b) 0.1876 (c) 187.6 (d) 18.76
  7. 7.0.97 × 26 — where does the decimal point go? (a) 0.2522 (b) 2.522 (c) 25.22 (d) 252.2
  8. 8.0.57 × 3 — where does the decimal point go? (a) 0.171 (b) 0.0171 (c) 17.1 (d) 1.71
  9. 9.3.7 × 0.5 — where does the decimal point go? (a) 1.85 (b) 0.185 (c) 18.5 (d) 0.0185
  10. 10.4.7 × 46 — where does the decimal point go? (a) 216.2 (b) 21.62 (c) 2.162 (d) 2162
  11. 11.2.4 × 0.9 — where does the decimal point go? (a) 0.0216 (b) 2.16 (c) 21.6 (d) 0.216
  12. 12.2.8 × 2 — where does the decimal point go? (a) 56 (b) 0.056 (c) 0.56 (d) 5.6
  13. 13.4.3 × 3 — where does the decimal point go? (a) 0.129 (b) 1.29 (c) 129 (d) 12.9
  14. 14.0.21 × 4 — where does the decimal point go? (a) 0.84 (b) 8.4 (c) 0.0084 (d) 0.084
  15. 15.0.21 × 7 — where does the decimal point go? (a) 1.47 (b) 0.147 (c) 14.7 (d) 0.0147
  16. 16.0.13 × 38 — where does the decimal point go? (a) 0.0494 (b) 49.4 (c) 0.494 (d) 4.94
  17. 17.0.38 × 7 — where does the decimal point go? (a) 26.6 (b) 0.0266 (c) 0.266 (d) 2.66
  18. 18.3.7 × 4.7 — where does the decimal point go? (a) 173.9 (b) 17.39 (c) 0.1739 (d) 1.739
  19. 19.5.7 × 3.5 — where does the decimal point go? (a) 1.995 (b) 0.1995 (c) 199.5 (d) 19.95
  20. 20.5.4 × 12 — where does the decimal point go? (a) 64.8 (b) 0.648 (c) 648 (d) 6.48
  21. 21.0.51 × 49 — where does the decimal point go? (a) 2.499 (b) 249.9 (c) 24.99 (d) 0.2499
  22. 22.0.23 × 34 — where does the decimal point go? (a) 7.82 (b) 0.782 (c) 0.0782 (d) 78.2
  23. 23.0.27 × 16 — where does the decimal point go? (a) 43.2 (b) 0.432 (c) 0.0432 (d) 4.32
  24. 24.0.58 × 0.2 — where does the decimal point go? (a) 0.116 (b) 0.00116 (c) 1.16 (d) 0.0116
  25. 25.7.5 × 7 — where does the decimal point go? (a) 525 (b) 5.25 (c) 52.5 (d) 0.525
  26. 26.0.28 × 4.7 — where does the decimal point go? (a) 1.316 (b) 0.01316 (c) 13.16 (d) 0.1316
  27. 27.8.6 × 4.3 — where does the decimal point go? (a) 0.3698 (b) 3.698 (c) 36.98 (d) 369.8
  28. 28.0.62 × 4 — where does the decimal point go? (a) 0.248 (b) 24.8 (c) 2.48 (d) 0.0248
  29. 29.0.41 × 46 — where does the decimal point go? (a) 188.6 (b) 1.886 (c) 18.86 (d) 0.1886
  30. 30.6.9 × 2.6 — where does the decimal point go? (a) 17.94 (b) 1.794 (c) 0.1794 (d) 179.4
  31. 31.2.1 × 5 — where does the decimal point go? (a) 1.05 (b) 105 (c) 10.5 (d) 0.105
  32. 32.3.8 × 4.7 — where does the decimal point go? (a) 0.1786 (b) 17.86 (c) 1.786 (d) 178.6
  33. 33.6.5 × 17 — where does the decimal point go? (a) 1.105 (b) 11.05 (c) 1105 (d) 110.5
  34. 34.0.38 × 0.2 — where does the decimal point go? (a) 0.076 (b) 0.76 (c) 0.0076 (d) 0.00076
  35. 35.0.73 × 2 — where does the decimal point go? (a) 0.146 (b) 1.46 (c) 14.6 (d) 0.0146
  36. 36.0.53 × 0.4 — where does the decimal point go? (a) 0.00212 (b) 2.12 (c) 0.212 (d) 0.0212
  37. 37.4.1 × 7 — where does the decimal point go? (a) 287 (b) 28.7 (c) 0.287 (d) 2.87
  38. 38.4.2 × 0.6 — where does the decimal point go? (a) 2.52 (b) 0.252 (c) 25.2 (d) 0.0252
  39. 39.0.47 × 6 — where does the decimal point go? (a) 28.2 (b) 2.82 (c) 0.282 (d) 0.0282
  40. 40.6.8 × 0.4 — where does the decimal point go? (a) 2.72 (b) 0.0272 (c) 0.272 (d) 27.2

Answer key

  1. 58.2
  2. 0.189
  3. 5.04
  4. 5.76
  5. 33.62
  6. 18.76
  7. 25.22
  8. 1.71
  9. 1.85
  10. 216.2
  11. 2.16
  12. 5.6
  13. 12.9
  14. 0.84
  15. 1.47
  16. 4.94
  17. 2.66
  18. 17.39
  19. 19.95
  20. 64.8
  21. 24.99
  22. 7.82
  23. 4.32
  24. 0.116
  25. 52.5
  26. 1.316
  27. 36.98
  28. 2.48
  29. 18.86
  30. 17.94
  31. 10.5
  32. 17.86
  33. 110.5
  34. 0.076
  35. 1.46
  36. 0.212
  37. 28.7
  38. 2.52
  39. 2.82
  40. 2.72

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