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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 435 · 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. 1.8.1 × 0.8 — where does the decimal point go? (a) 0.648 (b) 6.48 (c) 64.8 (d) 0.0648
  2. 2.0.17 × 3.4 — where does the decimal point go? (a) 0.00578 (b) 5.78 (c) 0.578 (d) 0.0578
  3. 3.4.7 × 0.6 — where does the decimal point go? (a) 2.82 (b) 28.2 (c) 0.0282 (d) 0.282
  4. 4.0.92 × 3 — where does the decimal point go? (a) 2.76 (b) 0.276 (c) 27.6 (d) 0.0276
  5. 5.0.63 × 0.5 — where does the decimal point go? (a) 0.0315 (b) 0.00315 (c) 0.315 (d) 3.15
  6. 6.8.2 × 6 — where does the decimal point go? (a) 4.92 (b) 0.492 (c) 49.2 (d) 492
  7. 7.8.1 × 2 — where does the decimal point go? (a) 0.162 (b) 1.62 (c) 16.2 (d) 162
  8. 8.4.2 × 2.3 — where does the decimal point go? (a) 9.66 (b) 0.966 (c) 96.6 (d) 0.0966
  9. 9.0.72 × 28 — where does the decimal point go? (a) 0.2016 (b) 2.016 (c) 20.16 (d) 201.6
  10. 10.0.18 × 32 — where does the decimal point go? (a) 0.576 (b) 0.0576 (c) 5.76 (d) 57.6
  11. 11.0.12 × 0.2 — where does the decimal point go? (a) 0.24 (b) 0.0024 (c) 0.00024 (d) 0.024
  12. 12.0.43 × 4 — where does the decimal point go? (a) 1.72 (b) 0.0172 (c) 0.172 (d) 17.2
  13. 13.1.8 × 1.1 — where does the decimal point go? (a) 19.8 (b) 0.198 (c) 1.98 (d) 0.0198
  14. 14.6.9 × 0.6 — where does the decimal point go? (a) 4.14 (b) 0.0414 (c) 0.414 (d) 41.4
  15. 15.1.3 × 6 — where does the decimal point go? (a) 0.078 (b) 7.8 (c) 78 (d) 0.78
  16. 16.3.5 × 3 — where does the decimal point go? (a) 10.5 (b) 1.05 (c) 0.105 (d) 105
  17. 17.0.18 × 0.2 — where does the decimal point go? (a) 0.0036 (b) 0.036 (c) 0.36 (d) 0.00036
  18. 18.1.4 × 2 — where does the decimal point go? (a) 28 (b) 2.8 (c) 0.28 (d) 0.028
  19. 19.0.23 × 7 — where does the decimal point go? (a) 0.161 (b) 1.61 (c) 0.0161 (d) 16.1
  20. 20.0.13 × 5 — where does the decimal point go? (a) 0.0065 (b) 0.065 (c) 0.65 (d) 6.5
  21. 21.6.2 × 0.2 — where does the decimal point go? (a) 0.124 (b) 0.0124 (c) 1.24 (d) 12.4
  22. 22.9.1 × 26 — where does the decimal point go? (a) 23.66 (b) 2.366 (c) 2366 (d) 236.6
  23. 23.3.4 × 13 — where does the decimal point go? (a) 4.42 (b) 442 (c) 44.2 (d) 0.442
  24. 24.3.9 × 0.2 — where does the decimal point go? (a) 0.78 (b) 0.078 (c) 0.0078 (d) 7.8
  25. 25.0.98 × 3 — where does the decimal point go? (a) 29.4 (b) 0.294 (c) 0.0294 (d) 2.94
  26. 26.0.43 × 8 — where does the decimal point go? (a) 3.44 (b) 34.4 (c) 0.344 (d) 0.0344
  27. 27.0.65 × 35 — where does the decimal point go? (a) 22.75 (b) 0.2275 (c) 227.5 (d) 2.275
  28. 28.9.4 × 19 — where does the decimal point go? (a) 17.86 (b) 1.786 (c) 1786 (d) 178.6
  29. 29.1.3 × 1.7 — where does the decimal point go? (a) 22.1 (b) 0.221 (c) 0.0221 (d) 2.21
  30. 30.6.1 × 0.4 — where does the decimal point go? (a) 2.44 (b) 0.244 (c) 0.0244 (d) 24.4
  31. 31.2.6 × 7 — where does the decimal point go? (a) 1.82 (b) 182 (c) 0.182 (d) 18.2
  32. 32.2.7 × 7 — where does the decimal point go? (a) 18.9 (b) 1.89 (c) 189 (d) 0.189
  33. 33.0.82 × 4 — where does the decimal point go? (a) 0.328 (b) 0.0328 (c) 3.28 (d) 32.8
  34. 34.9.9 × 2 — where does the decimal point go? (a) 0.198 (b) 19.8 (c) 198 (d) 1.98
  35. 35.0.61 × 33 — where does the decimal point go? (a) 2.013 (b) 0.2013 (c) 201.3 (d) 20.13
  36. 36.5.7 × 5 — where does the decimal point go? (a) 2.85 (b) 285 (c) 28.5 (d) 0.285
  37. 37.0.52 × 31 — where does the decimal point go? (a) 1.612 (b) 0.1612 (c) 161.2 (d) 16.12
  38. 38.6.6 × 36 — where does the decimal point go? (a) 2.376 (b) 23.76 (c) 237.6 (d) 2376
  39. 39.2.5 × 17 — where does the decimal point go? (a) 0.425 (b) 42.5 (c) 425 (d) 4.25
  40. 40.6.9 × 31 — where does the decimal point go? (a) 2.139 (b) 213.9 (c) 2139 (d) 21.39

Answer key

  1. 6.48
  2. 0.578
  3. 2.82
  4. 2.76
  5. 0.315
  6. 49.2
  7. 16.2
  8. 9.66
  9. 20.16
  10. 5.76
  11. 0.024
  12. 1.72
  13. 1.98
  14. 4.14
  15. 7.8
  16. 10.5
  17. 0.036
  18. 2.8
  19. 1.61
  20. 0.65
  21. 1.24
  22. 236.6
  23. 44.2
  24. 0.78
  25. 2.94
  26. 3.44
  27. 22.75
  28. 178.6
  29. 2.21
  30. 2.44
  31. 18.2
  32. 18.9
  33. 3.28
  34. 19.8
  35. 20.13
  36. 28.5
  37. 16.12
  38. 237.6
  39. 42.5
  40. 213.9

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