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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 830 · 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. 1.5.1 × 5 — where does the decimal point go? (a) 0.255 (b) 2.55 (c) 25.5 (d) 255
  2. 2.3.3 × 3 — where does the decimal point go? (a) 9.9 (b) 0.99 (c) 99 (d) 0.099
  3. 3.6.6 × 33 — where does the decimal point go? (a) 217.8 (b) 2.178 (c) 2178 (d) 21.78
  4. 4.2.3 × 0.2 — where does the decimal point go? (a) 0.0046 (b) 0.46 (c) 0.046 (d) 4.6
  5. 5.0.54 × 4.4 — where does the decimal point go? (a) 0.02376 (b) 0.2376 (c) 23.76 (d) 2.376
  6. 6.6.6 × 12 — where does the decimal point go? (a) 0.792 (b) 792 (c) 79.2 (d) 7.92
  7. 7.2.6 × 2 — where does the decimal point go? (a) 0.052 (b) 52 (c) 5.2 (d) 0.52
  8. 8.8.7 × 3.8 — where does the decimal point go? (a) 0.3306 (b) 330.6 (c) 3.306 (d) 33.06
  9. 9.0.45 × 7 — where does the decimal point go? (a) 31.5 (b) 3.15 (c) 0.0315 (d) 0.315
  10. 10.5.2 × 6 — where does the decimal point go? (a) 312 (b) 31.2 (c) 3.12 (d) 0.312
  11. 11.5.3 × 2 — where does the decimal point go? (a) 10.6 (b) 1.06 (c) 0.106 (d) 106
  12. 12.4.7 × 33 — where does the decimal point go? (a) 155.1 (b) 15.51 (c) 1.551 (d) 1551
  13. 13.0.12 × 3 — where does the decimal point go? (a) 0.036 (b) 0.0036 (c) 0.36 (d) 3.6
  14. 14.0.45 × 0.9 — where does the decimal point go? (a) 4.05 (b) 0.0405 (c) 0.405 (d) 0.00405
  15. 15.0.47 × 47 — where does the decimal point go? (a) 2.209 (b) 220.9 (c) 22.09 (d) 0.2209
  16. 16.9.8 × 31 — where does the decimal point go? (a) 3038 (b) 3.038 (c) 30.38 (d) 303.8
  17. 17.5.2 × 3 — where does the decimal point go? (a) 0.156 (b) 15.6 (c) 1.56 (d) 156
  18. 18.0.17 × 0.4 — where does the decimal point go? (a) 0.0068 (b) 0.00068 (c) 0.68 (d) 0.068
  19. 19.0.26 × 24 — where does the decimal point go? (a) 0.0624 (b) 0.624 (c) 6.24 (d) 62.4
  20. 20.0.14 × 33 — where does the decimal point go? (a) 0.0462 (b) 0.462 (c) 46.2 (d) 4.62
  21. 21.0.43 × 2.1 — where does the decimal point go? (a) 0.0903 (b) 9.03 (c) 0.903 (d) 0.00903
  22. 22.0.73 × 0.3 — where does the decimal point go? (a) 0.219 (b) 0.0219 (c) 0.00219 (d) 2.19
  23. 23.0.87 × 1.2 — where does the decimal point go? (a) 0.1044 (b) 0.01044 (c) 1.044 (d) 10.44
  24. 24.0.22 × 2 — where does the decimal point go? (a) 0.0044 (b) 0.44 (c) 0.044 (d) 4.4
  25. 25.2.2 × 6 — where does the decimal point go? (a) 13.2 (b) 0.132 (c) 132 (d) 1.32
  26. 26.6.8 × 0.7 — where does the decimal point go? (a) 4.76 (b) 0.476 (c) 0.0476 (d) 47.6
  27. 27.0.38 × 3 — where does the decimal point go? (a) 0.0114 (b) 1.14 (c) 0.114 (d) 11.4
  28. 28.3.9 × 27 — where does the decimal point go? (a) 10.53 (b) 105.3 (c) 1053 (d) 1.053
  29. 29.1.5 × 0.7 — where does the decimal point go? (a) 1.05 (b) 0.105 (c) 10.5 (d) 0.0105
  30. 30.7.9 × 9 — where does the decimal point go? (a) 71.1 (b) 7.11 (c) 0.711 (d) 711
  31. 31.9.8 × 0.2 — where does the decimal point go? (a) 0.196 (b) 0.0196 (c) 19.6 (d) 1.96
  32. 32.7.2 × 0.3 — where does the decimal point go? (a) 0.0216 (b) 0.216 (c) 2.16 (d) 21.6
  33. 33.0.85 × 5 — where does the decimal point go? (a) 0.425 (b) 42.5 (c) 0.0425 (d) 4.25
  34. 34.0.61 × 0.4 — where does the decimal point go? (a) 2.44 (b) 0.0244 (c) 0.244 (d) 0.00244
  35. 35.7.6 × 22 — where does the decimal point go? (a) 1.672 (b) 16.72 (c) 1672 (d) 167.2
  36. 36.0.38 × 47 — where does the decimal point go? (a) 0.1786 (b) 17.86 (c) 1.786 (d) 178.6
  37. 37.1.3 × 0.6 — where does the decimal point go? (a) 0.78 (b) 7.8 (c) 0.0078 (d) 0.078
  38. 38.0.24 × 4.8 — where does the decimal point go? (a) 0.1152 (b) 1.152 (c) 11.52 (d) 0.01152
  39. 39.8.2 × 36 — where does the decimal point go? (a) 295.2 (b) 29.52 (c) 2.952 (d) 2952
  40. 40.3.4 × 18 — where does the decimal point go? (a) 0.612 (b) 61.2 (c) 6.12 (d) 612

Answer key

  1. 25.5
  2. 9.9
  3. 217.8
  4. 0.46
  5. 2.376
  6. 79.2
  7. 5.2
  8. 33.06
  9. 3.15
  10. 31.2
  11. 10.6
  12. 155.1
  13. 0.36
  14. 0.405
  15. 22.09
  16. 303.8
  17. 15.6
  18. 0.068
  19. 6.24
  20. 4.62
  21. 0.903
  22. 0.219
  23. 1.044
  24. 0.44
  25. 13.2
  26. 4.76
  27. 1.14
  28. 105.3
  29. 1.05
  30. 71.1
  31. 1.96
  32. 2.16
  33. 4.25
  34. 0.244
  35. 167.2
  36. 17.86
  37. 0.78
  38. 1.152
  39. 295.2
  40. 61.2

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