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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 491 · 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. 1.0.85 × 2.5 — where does the decimal point go? (a) 0.2125 (b) 0.02125 (c) 2.125 (d) 21.25
  2. 2.4.7 × 0.9 — where does the decimal point go? (a) 42.3 (b) 0.0423 (c) 0.423 (d) 4.23
  3. 3.4.7 × 5 — where does the decimal point go? (a) 0.235 (b) 235 (c) 23.5 (d) 2.35
  4. 4.0.53 × 0.2 — where does the decimal point go? (a) 0.0106 (b) 1.06 (c) 0.00106 (d) 0.106
  5. 5.0.82 × 8 — where does the decimal point go? (a) 65.6 (b) 6.56 (c) 0.656 (d) 0.0656
  6. 6.8.8 × 4 — where does the decimal point go? (a) 0.352 (b) 35.2 (c) 352 (d) 3.52
  7. 7.0.98 × 11 — where does the decimal point go? (a) 1.078 (b) 10.78 (c) 107.8 (d) 0.1078
  8. 8.2.8 × 27 — where does the decimal point go? (a) 75.6 (b) 756 (c) 7.56 (d) 0.756
  9. 9.8.9 × 15 — where does the decimal point go? (a) 1335 (b) 133.5 (c) 13.35 (d) 1.335
  10. 10.3.9 × 9 — where does the decimal point go? (a) 35.1 (b) 3.51 (c) 351 (d) 0.351
  11. 11.0.89 × 8 — where does the decimal point go? (a) 0.0712 (b) 0.712 (c) 7.12 (d) 71.2
  12. 12.0.71 × 0.4 — where does the decimal point go? (a) 0.0284 (b) 0.00284 (c) 0.284 (d) 2.84
  13. 13.1.3 × 0.4 — where does the decimal point go? (a) 0.52 (b) 0.0052 (c) 0.052 (d) 5.2
  14. 14.0.21 × 32 — where does the decimal point go? (a) 0.672 (b) 0.0672 (c) 67.2 (d) 6.72
  15. 15.6.9 × 13 — where does the decimal point go? (a) 89.7 (b) 897 (c) 0.897 (d) 8.97
  16. 16.3.6 × 47 — where does the decimal point go? (a) 16.92 (b) 1692 (c) 169.2 (d) 1.692
  17. 17.0.84 × 17 — where does the decimal point go? (a) 142.8 (b) 0.1428 (c) 14.28 (d) 1.428
  18. 18.0.13 × 17 — where does the decimal point go? (a) 0.221 (b) 22.1 (c) 2.21 (d) 0.0221
  19. 19.0.26 × 7 — where does the decimal point go? (a) 0.0182 (b) 1.82 (c) 0.182 (d) 18.2
  20. 20.3.8 × 37 — where does the decimal point go? (a) 1.406 (b) 140.6 (c) 14.06 (d) 1406
  21. 21.3.8 × 0.4 — where does the decimal point go? (a) 15.2 (b) 1.52 (c) 0.152 (d) 0.0152
  22. 22.9.7 × 0.5 — where does the decimal point go? (a) 0.485 (b) 4.85 (c) 0.0485 (d) 48.5
  23. 23.2.3 × 3.4 — where does the decimal point go? (a) 0.782 (b) 78.2 (c) 0.0782 (d) 7.82
  24. 24.2.3 × 0.6 — where does the decimal point go? (a) 0.0138 (b) 0.138 (c) 13.8 (d) 1.38
  25. 25.6.6 × 0.6 — where does the decimal point go? (a) 0.0396 (b) 0.396 (c) 39.6 (d) 3.96
  26. 26.5.4 × 3 — where does the decimal point go? (a) 0.162 (b) 162 (c) 1.62 (d) 16.2
  27. 27.0.63 × 0.5 — where does the decimal point go? (a) 3.15 (b) 0.315 (c) 0.00315 (d) 0.0315
  28. 28.0.96 × 9 — where does the decimal point go? (a) 0.864 (b) 86.4 (c) 8.64 (d) 0.0864
  29. 29.0.26 × 3 — where does the decimal point go? (a) 0.0078 (b) 7.8 (c) 0.078 (d) 0.78
  30. 30.1.3 × 1.2 — where does the decimal point go? (a) 0.156 (b) 1.56 (c) 0.0156 (d) 15.6
  31. 31.7.9 × 4.3 — where does the decimal point go? (a) 33.97 (b) 3.397 (c) 0.3397 (d) 339.7
  32. 32.8.2 × 3 — where does the decimal point go? (a) 246 (b) 2.46 (c) 0.246 (d) 24.6
  33. 33.5.2 × 0.7 — where does the decimal point go? (a) 0.0364 (b) 36.4 (c) 0.364 (d) 3.64
  34. 34.9.8 × 0.2 — where does the decimal point go? (a) 0.196 (b) 19.6 (c) 0.0196 (d) 1.96
  35. 35.1.9 × 3.6 — where does the decimal point go? (a) 6.84 (b) 0.684 (c) 0.0684 (d) 68.4
  36. 36.4.4 × 7 — where does the decimal point go? (a) 30.8 (b) 3.08 (c) 0.308 (d) 308
  37. 37.0.52 × 7 — where does the decimal point go? (a) 3.64 (b) 0.364 (c) 36.4 (d) 0.0364
  38. 38.0.24 × 0.9 — where does the decimal point go? (a) 2.16 (b) 0.216 (c) 0.0216 (d) 0.00216
  39. 39.0.57 × 14 — where does the decimal point go? (a) 0.0798 (b) 0.798 (c) 79.8 (d) 7.98
  40. 40.4.6 × 21 — where does the decimal point go? (a) 966 (b) 96.6 (c) 9.66 (d) 0.966

Answer key

  1. 2.125
  2. 4.23
  3. 23.5
  4. 0.106
  5. 6.56
  6. 35.2
  7. 10.78
  8. 75.6
  9. 133.5
  10. 35.1
  11. 7.12
  12. 0.284
  13. 0.52
  14. 6.72
  15. 89.7
  16. 169.2
  17. 14.28
  18. 2.21
  19. 1.82
  20. 140.6
  21. 1.52
  22. 4.85
  23. 7.82
  24. 1.38
  25. 3.96
  26. 16.2
  27. 0.315
  28. 8.64
  29. 0.78
  30. 1.56
  31. 33.97
  32. 24.6
  33. 3.64
  34. 1.96
  35. 6.84
  36. 30.8
  37. 3.64
  38. 0.216
  39. 7.98
  40. 96.6

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