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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 688 · 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. 1.0.25 × 0.9 — where does the decimal point go? (a) 2.25 (b) 0.0225 (c) 0.225 (d) 0.00225
  2. 2.5.1 × 0.5 — where does the decimal point go? (a) 0.0255 (b) 2.55 (c) 0.255 (d) 25.5
  3. 3.7.2 × 3 — where does the decimal point go? (a) 2.16 (b) 0.216 (c) 216 (d) 21.6
  4. 4.7.7 × 4.1 — where does the decimal point go? (a) 0.3157 (b) 3.157 (c) 315.7 (d) 31.57
  5. 5.0.62 × 6 — where does the decimal point go? (a) 3.72 (b) 0.372 (c) 0.0372 (d) 37.2
  6. 6.0.87 × 29 — where does the decimal point go? (a) 252.3 (b) 25.23 (c) 0.2523 (d) 2.523
  7. 7.0.51 × 0.3 — where does the decimal point go? (a) 0.00153 (b) 0.153 (c) 1.53 (d) 0.0153
  8. 8.8.3 × 3 — where does the decimal point go? (a) 24.9 (b) 249 (c) 2.49 (d) 0.249
  9. 9.8.4 × 1.8 — where does the decimal point go? (a) 15.12 (b) 0.1512 (c) 151.2 (d) 1.512
  10. 10.1.2 × 46 — where does the decimal point go? (a) 0.552 (b) 552 (c) 55.2 (d) 5.52
  11. 11.0.32 × 4 — where does the decimal point go? (a) 0.128 (b) 1.28 (c) 0.0128 (d) 12.8
  12. 12.4.3 × 32 — where does the decimal point go? (a) 1376 (b) 137.6 (c) 1.376 (d) 13.76
  13. 13.0.31 × 21 — where does the decimal point go? (a) 0.651 (b) 65.1 (c) 6.51 (d) 0.0651
  14. 14.4.5 × 0.9 — where does the decimal point go? (a) 40.5 (b) 0.0405 (c) 0.405 (d) 4.05
  15. 15.3.9 × 4.5 — where does the decimal point go? (a) 17.55 (b) 1.755 (c) 0.1755 (d) 175.5
  16. 16.8.4 × 34 — where does the decimal point go? (a) 28.56 (b) 2856 (c) 2.856 (d) 285.6
  17. 17.2.8 × 0.2 — where does the decimal point go? (a) 0.0056 (b) 0.056 (c) 5.6 (d) 0.56
  18. 18.0.74 × 7 — where does the decimal point go? (a) 5.18 (b) 0.518 (c) 0.0518 (d) 51.8
  19. 19.8.1 × 0.6 — where does the decimal point go? (a) 48.6 (b) 0.486 (c) 4.86 (d) 0.0486
  20. 20.4.9 × 11 — where does the decimal point go? (a) 53.9 (b) 539 (c) 5.39 (d) 0.539
  21. 21.0.23 × 27 — where does the decimal point go? (a) 62.1 (b) 6.21 (c) 0.621 (d) 0.0621
  22. 22.2.3 × 48 — where does the decimal point go? (a) 1104 (b) 110.4 (c) 11.04 (d) 1.104
  23. 23.4.7 × 46 — where does the decimal point go? (a) 21.62 (b) 2162 (c) 2.162 (d) 216.2
  24. 24.5.9 × 4 — where does the decimal point go? (a) 236 (b) 23.6 (c) 2.36 (d) 0.236
  25. 25.0.85 × 5 — where does the decimal point go? (a) 4.25 (b) 0.0425 (c) 42.5 (d) 0.425
  26. 26.6.9 × 24 — where does the decimal point go? (a) 165.6 (b) 1656 (c) 1.656 (d) 16.56
  27. 27.0.65 × 5 — where does the decimal point go? (a) 0.0325 (b) 0.325 (c) 3.25 (d) 32.5
  28. 28.0.27 × 4.6 — where does the decimal point go? (a) 1.242 (b) 0.1242 (c) 0.01242 (d) 12.42
  29. 29.0.69 × 1.6 — where does the decimal point go? (a) 0.1104 (b) 1.104 (c) 0.01104 (d) 11.04
  30. 30.0.72 × 0.3 — where does the decimal point go? (a) 0.216 (b) 0.0216 (c) 0.00216 (d) 2.16
  31. 31.1.6 × 19 — where does the decimal point go? (a) 30.4 (b) 0.304 (c) 304 (d) 3.04
  32. 32.0.26 × 3 — where does the decimal point go? (a) 0.0078 (b) 0.78 (c) 7.8 (d) 0.078
  33. 33.7.1 × 8 — where does the decimal point go? (a) 56.8 (b) 0.568 (c) 568 (d) 5.68
  34. 34.2.6 × 3 — where does the decimal point go? (a) 78 (b) 0.78 (c) 7.8 (d) 0.078
  35. 35.0.31 × 6 — where does the decimal point go? (a) 18.6 (b) 1.86 (c) 0.0186 (d) 0.186
  36. 36.1.7 × 17 — where does the decimal point go? (a) 0.289 (b) 28.9 (c) 2.89 (d) 289
  37. 37.0.99 × 0.5 — where does the decimal point go? (a) 4.95 (b) 0.00495 (c) 0.0495 (d) 0.495
  38. 38.6.1 × 4.9 — where does the decimal point go? (a) 29.89 (b) 298.9 (c) 0.2989 (d) 2.989
  39. 39.3.8 × 48 — where does the decimal point go? (a) 1.824 (b) 1824 (c) 182.4 (d) 18.24
  40. 40.0.42 × 43 — where does the decimal point go? (a) 180.6 (b) 0.1806 (c) 18.06 (d) 1.806

Answer key

  1. 0.225
  2. 2.55
  3. 21.6
  4. 31.57
  5. 3.72
  6. 25.23
  7. 0.153
  8. 24.9
  9. 15.12
  10. 55.2
  11. 1.28
  12. 137.6
  13. 6.51
  14. 4.05
  15. 17.55
  16. 285.6
  17. 0.56
  18. 5.18
  19. 4.86
  20. 53.9
  21. 6.21
  22. 110.4
  23. 216.2
  24. 23.6
  25. 4.25
  26. 165.6
  27. 3.25
  28. 1.242
  29. 1.104
  30. 0.216
  31. 30.4
  32. 0.78
  33. 56.8
  34. 7.8
  35. 1.86
  36. 28.9
  37. 0.495
  38. 29.89
  39. 182.4
  40. 18.06

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