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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 118 · 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. 1.0.48 × 0.2 — where does the decimal point go? (a) 0.0096 (b) 0.00096 (c) 0.096 (d) 0.96
  2. 2.0.81 × 0.5 — where does the decimal point go? (a) 0.00405 (b) 4.05 (c) 0.405 (d) 0.0405
  3. 3.8.3 × 0.6 — where does the decimal point go? (a) 0.0498 (b) 49.8 (c) 4.98 (d) 0.498
  4. 4.1.8 × 0.4 — where does the decimal point go? (a) 0.072 (b) 7.2 (c) 0.0072 (d) 0.72
  5. 5.1.3 × 0.2 — where does the decimal point go? (a) 0.026 (b) 0.26 (c) 2.6 (d) 0.0026
  6. 6.4.5 × 9 — where does the decimal point go? (a) 0.405 (b) 40.5 (c) 4.05 (d) 405
  7. 7.0.33 × 0.7 — where does the decimal point go? (a) 0.0231 (b) 0.231 (c) 0.00231 (d) 2.31
  8. 8.4.7 × 9 — where does the decimal point go? (a) 42.3 (b) 423 (c) 4.23 (d) 0.423
  9. 9.7.7 × 2 — where does the decimal point go? (a) 0.154 (b) 154 (c) 1.54 (d) 15.4
  10. 10.7.6 × 0.2 — where does the decimal point go? (a) 0.0152 (b) 15.2 (c) 0.152 (d) 1.52
  11. 11.2.2 × 0.7 — where does the decimal point go? (a) 0.0154 (b) 1.54 (c) 15.4 (d) 0.154
  12. 12.5.6 × 6 — where does the decimal point go? (a) 3.36 (b) 33.6 (c) 0.336 (d) 336
  13. 13.0.71 × 0.5 — where does the decimal point go? (a) 0.355 (b) 3.55 (c) 0.00355 (d) 0.0355
  14. 14.5.1 × 0.3 — where does the decimal point go? (a) 15.3 (b) 1.53 (c) 0.0153 (d) 0.153
  15. 15.0.81 × 0.3 — where does the decimal point go? (a) 2.43 (b) 0.0243 (c) 0.00243 (d) 0.243
  16. 16.2.5 × 2.1 — where does the decimal point go? (a) 5.25 (b) 0.525 (c) 0.0525 (d) 52.5
  17. 17.0.79 × 1.8 — where does the decimal point go? (a) 14.22 (b) 1.422 (c) 0.1422 (d) 0.01422
  18. 18.4.5 × 0.7 — where does the decimal point go? (a) 3.15 (b) 0.315 (c) 0.0315 (d) 31.5
  19. 19.3.5 × 9 — where does the decimal point go? (a) 31.5 (b) 315 (c) 0.315 (d) 3.15
  20. 20.0.47 × 3.1 — where does the decimal point go? (a) 0.01457 (b) 0.1457 (c) 14.57 (d) 1.457
  21. 21.0.53 × 1.8 — where does the decimal point go? (a) 0.00954 (b) 0.954 (c) 9.54 (d) 0.0954
  22. 22.9.9 × 7 — where does the decimal point go? (a) 69.3 (b) 0.693 (c) 6.93 (d) 693
  23. 23.2.9 × 2.6 — where does the decimal point go? (a) 0.754 (b) 75.4 (c) 7.54 (d) 0.0754
  24. 24.3.3 × 7 — where does the decimal point go? (a) 2.31 (b) 231 (c) 23.1 (d) 0.231
  25. 25.0.47 × 8 — where does the decimal point go? (a) 0.376 (b) 0.0376 (c) 3.76 (d) 37.6
  26. 26.4.9 × 4 — where does the decimal point go? (a) 19.6 (b) 196 (c) 1.96 (d) 0.196
  27. 27.0.54 × 0.2 — where does the decimal point go? (a) 1.08 (b) 0.0108 (c) 0.00108 (d) 0.108
  28. 28.3.6 × 48 — where does the decimal point go? (a) 1728 (b) 1.728 (c) 17.28 (d) 172.8
  29. 29.0.47 × 4.8 — where does the decimal point go? (a) 2.256 (b) 0.02256 (c) 0.2256 (d) 22.56
  30. 30.0.75 × 3.7 — where does the decimal point go? (a) 0.2775 (b) 27.75 (c) 2.775 (d) 0.02775
  31. 31.6.2 × 0.9 — where does the decimal point go? (a) 55.8 (b) 5.58 (c) 0.0558 (d) 0.558
  32. 32.9.4 × 6 — where does the decimal point go? (a) 5.64 (b) 564 (c) 0.564 (d) 56.4
  33. 33.0.92 × 4 — where does the decimal point go? (a) 0.368 (b) 3.68 (c) 36.8 (d) 0.0368
  34. 34.0.25 × 0.3 — where does the decimal point go? (a) 0.0075 (b) 0.00075 (c) 0.075 (d) 0.75
  35. 35.5.4 × 4.2 — where does the decimal point go? (a) 22.68 (b) 0.2268 (c) 2.268 (d) 226.8
  36. 36.2.2 × 3.1 — where does the decimal point go? (a) 0.682 (b) 6.82 (c) 0.0682 (d) 68.2
  37. 37.5.3 × 0.8 — where does the decimal point go? (a) 0.424 (b) 4.24 (c) 0.0424 (d) 42.4
  38. 38.8.2 × 27 — where does the decimal point go? (a) 22.14 (b) 221.4 (c) 2.214 (d) 2214
  39. 39.3.9 × 25 — where does the decimal point go? (a) 975 (b) 9.75 (c) 97.5 (d) 0.975
  40. 40.0.34 × 0.9 — where does the decimal point go? (a) 0.306 (b) 0.00306 (c) 0.0306 (d) 3.06

Answer key

  1. 0.096
  2. 0.405
  3. 4.98
  4. 0.72
  5. 0.26
  6. 40.5
  7. 0.231
  8. 42.3
  9. 15.4
  10. 1.52
  11. 1.54
  12. 33.6
  13. 0.355
  14. 1.53
  15. 0.243
  16. 5.25
  17. 1.422
  18. 3.15
  19. 31.5
  20. 1.457
  21. 0.954
  22. 69.3
  23. 7.54
  24. 23.1
  25. 3.76
  26. 19.6
  27. 0.108
  28. 172.8
  29. 2.256
  30. 2.775
  31. 5.58
  32. 56.4
  33. 3.68
  34. 0.075
  35. 22.68
  36. 6.82
  37. 4.24
  38. 221.4
  39. 97.5
  40. 0.306

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