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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 13 · 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. 1.0.12 × 0.6 — where does the decimal point go? (a) 0.072 (b) 0.00072 (c) 0.72 (d) 0.0072
  2. 2.0.58 × 2 — where does the decimal point go? (a) 1.16 (b) 0.0116 (c) 0.116 (d) 11.6
  3. 3.0.85 × 33 — where does the decimal point go? (a) 2.805 (b) 280.5 (c) 0.2805 (d) 28.05
  4. 4.0.28 × 4 — where does the decimal point go? (a) 0.0112 (b) 11.2 (c) 1.12 (d) 0.112
  5. 5.6.1 × 0.2 — where does the decimal point go? (a) 0.122 (b) 12.2 (c) 0.0122 (d) 1.22
  6. 6.0.53 × 6 — where does the decimal point go? (a) 0.0318 (b) 3.18 (c) 0.318 (d) 31.8
  7. 7.0.45 × 5 — where does the decimal point go? (a) 2.25 (b) 0.225 (c) 0.0225 (d) 22.5
  8. 8.4.6 × 9 — where does the decimal point go? (a) 414 (b) 41.4 (c) 0.414 (d) 4.14
  9. 9.0.81 × 3.7 — where does the decimal point go? (a) 0.2997 (b) 29.97 (c) 2.997 (d) 0.02997
  10. 10.0.99 × 42 — where does the decimal point go? (a) 0.4158 (b) 4.158 (c) 415.8 (d) 41.58
  11. 11.0.84 × 8 — where does the decimal point go? (a) 67.2 (b) 6.72 (c) 0.0672 (d) 0.672
  12. 12.5.7 × 2.3 — where does the decimal point go? (a) 1.311 (b) 0.1311 (c) 131.1 (d) 13.11
  13. 13.0.46 × 0.9 — where does the decimal point go? (a) 0.00414 (b) 0.414 (c) 4.14 (d) 0.0414
  14. 14.0.77 × 4 — where does the decimal point go? (a) 3.08 (b) 0.0308 (c) 0.308 (d) 30.8
  15. 15.5.3 × 1.3 — where does the decimal point go? (a) 0.689 (b) 6.89 (c) 68.9 (d) 0.0689
  16. 16.4.8 × 0.7 — where does the decimal point go? (a) 0.0336 (b) 33.6 (c) 3.36 (d) 0.336
  17. 17.0.12 × 4 — where does the decimal point go? (a) 0.48 (b) 0.0048 (c) 4.8 (d) 0.048
  18. 18.1.3 × 12 — where does the decimal point go? (a) 15.6 (b) 0.156 (c) 156 (d) 1.56
  19. 19.9.8 × 41 — where does the decimal point go? (a) 40.18 (b) 4018 (c) 4.018 (d) 401.8
  20. 20.0.79 × 3.1 — where does the decimal point go? (a) 2.449 (b) 0.02449 (c) 0.2449 (d) 24.49
  21. 21.0.71 × 13 — where does the decimal point go? (a) 0.0923 (b) 9.23 (c) 0.923 (d) 92.3
  22. 22.0.79 × 3 — where does the decimal point go? (a) 2.37 (b) 0.237 (c) 23.7 (d) 0.0237
  23. 23.2.4 × 9 — where does the decimal point go? (a) 216 (b) 21.6 (c) 2.16 (d) 0.216
  24. 24.0.46 × 4 — where does the decimal point go? (a) 0.184 (b) 18.4 (c) 1.84 (d) 0.0184
  25. 25.6.7 × 2 — where does the decimal point go? (a) 1.34 (b) 0.134 (c) 134 (d) 13.4
  26. 26.0.27 × 3.4 — where does the decimal point go? (a) 0.0918 (b) 0.00918 (c) 0.918 (d) 9.18
  27. 27.0.13 × 22 — where does the decimal point go? (a) 0.286 (b) 2.86 (c) 0.0286 (d) 28.6
  28. 28.0.28 × 19 — where does the decimal point go? (a) 0.532 (b) 53.2 (c) 5.32 (d) 0.0532
  29. 29.0.13 × 0.9 — where does the decimal point go? (a) 0.0117 (b) 0.00117 (c) 0.117 (d) 1.17
  30. 30.7.9 × 9 — where does the decimal point go? (a) 711 (b) 7.11 (c) 0.711 (d) 71.1
  31. 31.2.8 × 2.4 — where does the decimal point go? (a) 0.0672 (b) 6.72 (c) 0.672 (d) 67.2
  32. 32.8.2 × 33 — where does the decimal point go? (a) 27.06 (b) 2.706 (c) 2706 (d) 270.6
  33. 33.6.1 × 49 — where does the decimal point go? (a) 2.989 (b) 29.89 (c) 2989 (d) 298.9
  34. 34.5.8 × 6 — where does the decimal point go? (a) 34.8 (b) 3.48 (c) 0.348 (d) 348
  35. 35.2.1 × 42 — where does the decimal point go? (a) 0.882 (b) 8.82 (c) 882 (d) 88.2
  36. 36.8.1 × 1.5 — where does the decimal point go? (a) 12.15 (b) 0.1215 (c) 1.215 (d) 121.5
  37. 37.0.28 × 4.9 — where does the decimal point go? (a) 0.1372 (b) 13.72 (c) 0.01372 (d) 1.372
  38. 38.0.91 × 48 — where does the decimal point go? (a) 0.4368 (b) 4.368 (c) 436.8 (d) 43.68
  39. 39.9.1 × 6 — where does the decimal point go? (a) 546 (b) 54.6 (c) 0.546 (d) 5.46
  40. 40.2.9 × 42 — where does the decimal point go? (a) 121.8 (b) 12.18 (c) 1218 (d) 1.218

Answer key

  1. 0.072
  2. 1.16
  3. 28.05
  4. 1.12
  5. 1.22
  6. 3.18
  7. 2.25
  8. 41.4
  9. 2.997
  10. 41.58
  11. 6.72
  12. 13.11
  13. 0.414
  14. 3.08
  15. 6.89
  16. 3.36
  17. 0.48
  18. 15.6
  19. 401.8
  20. 2.449
  21. 9.23
  22. 2.37
  23. 21.6
  24. 1.84
  25. 13.4
  26. 0.918
  27. 2.86
  28. 5.32
  29. 0.117
  30. 71.1
  31. 6.72
  32. 270.6
  33. 298.9
  34. 34.8
  35. 88.2
  36. 12.15
  37. 1.372
  38. 43.68
  39. 54.6
  40. 121.8

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