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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 241 · 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. 1.9.7 × 4.1 — where does the decimal point go? (a) 397.7 (b) 3.977 (c) 0.3977 (d) 39.77
  2. 2.7.8 × 48 — where does the decimal point go? (a) 374.4 (b) 3.744 (c) 37.44 (d) 3744
  3. 3.0.25 × 0.3 — where does the decimal point go? (a) 0.075 (b) 0.75 (c) 0.0075 (d) 0.00075
  4. 4.0.89 × 4 — where does the decimal point go? (a) 0.0356 (b) 0.356 (c) 35.6 (d) 3.56
  5. 5.6.2 × 2 — where does the decimal point go? (a) 12.4 (b) 0.124 (c) 124 (d) 1.24
  6. 6.0.56 × 12 — where does the decimal point go? (a) 0.0672 (b) 67.2 (c) 0.672 (d) 6.72
  7. 7.6.3 × 42 — where does the decimal point go? (a) 2.646 (b) 26.46 (c) 264.6 (d) 2646
  8. 8.2.4 × 7 — where does the decimal point go? (a) 1.68 (b) 16.8 (c) 0.168 (d) 168
  9. 9.0.91 × 0.3 — where does the decimal point go? (a) 2.73 (b) 0.273 (c) 0.00273 (d) 0.0273
  10. 10.5.9 × 48 — where does the decimal point go? (a) 2832 (b) 2.832 (c) 28.32 (d) 283.2
  11. 11.2.4 × 1.7 — where does the decimal point go? (a) 4.08 (b) 0.408 (c) 0.0408 (d) 40.8
  12. 12.6.1 × 13 — where does the decimal point go? (a) 0.793 (b) 7.93 (c) 79.3 (d) 793
  13. 13.0.53 × 1.4 — where does the decimal point go? (a) 0.742 (b) 7.42 (c) 0.00742 (d) 0.0742
  14. 14.9.9 × 9 — where does the decimal point go? (a) 89.1 (b) 891 (c) 8.91 (d) 0.891
  15. 15.0.64 × 1.2 — where does the decimal point go? (a) 0.00768 (b) 7.68 (c) 0.768 (d) 0.0768
  16. 16.5.5 × 9 — where does the decimal point go? (a) 49.5 (b) 495 (c) 4.95 (d) 0.495
  17. 17.2.6 × 1.1 — where does the decimal point go? (a) 0.0286 (b) 2.86 (c) 0.286 (d) 28.6
  18. 18.8.4 × 8 — where does the decimal point go? (a) 0.672 (b) 67.2 (c) 6.72 (d) 672
  19. 19.6.7 × 7 — where does the decimal point go? (a) 0.469 (b) 46.9 (c) 469 (d) 4.69
  20. 20.0.28 × 2.3 — where does the decimal point go? (a) 0.00644 (b) 6.44 (c) 0.644 (d) 0.0644
  21. 21.4.3 × 0.4 — where does the decimal point go? (a) 1.72 (b) 0.172 (c) 0.0172 (d) 17.2
  22. 22.8.3 × 2 — where does the decimal point go? (a) 1.66 (b) 166 (c) 0.166 (d) 16.6
  23. 23.0.15 × 0.7 — where does the decimal point go? (a) 1.05 (b) 0.0105 (c) 0.105 (d) 0.00105
  24. 24.0.97 × 21 — where does the decimal point go? (a) 203.7 (b) 2.037 (c) 20.37 (d) 0.2037
  25. 25.0.17 × 0.3 — where does the decimal point go? (a) 0.051 (b) 0.0051 (c) 0.00051 (d) 0.51
  26. 26.9.7 × 9 — where does the decimal point go? (a) 873 (b) 8.73 (c) 0.873 (d) 87.3
  27. 27.0.24 × 0.2 — where does the decimal point go? (a) 0.0048 (b) 0.00048 (c) 0.048 (d) 0.48
  28. 28.0.54 × 28 — where does the decimal point go? (a) 15.12 (b) 151.2 (c) 1.512 (d) 0.1512
  29. 29.5.6 × 0.2 — where does the decimal point go? (a) 0.0112 (b) 0.112 (c) 11.2 (d) 1.12
  30. 30.0.31 × 37 — where does the decimal point go? (a) 11.47 (b) 0.1147 (c) 1.147 (d) 114.7
  31. 31.0.84 × 34 — where does the decimal point go? (a) 285.6 (b) 28.56 (c) 0.2856 (d) 2.856
  32. 32.0.21 × 1.4 — where does the decimal point go? (a) 0.0294 (b) 0.00294 (c) 2.94 (d) 0.294
  33. 33.0.78 × 8 — where does the decimal point go? (a) 0.624 (b) 6.24 (c) 62.4 (d) 0.0624
  34. 34.0.83 × 5 — where does the decimal point go? (a) 0.0415 (b) 4.15 (c) 0.415 (d) 41.5
  35. 35.0.23 × 19 — where does the decimal point go? (a) 4.37 (b) 0.437 (c) 0.0437 (d) 43.7
  36. 36.9.9 × 2.5 — where does the decimal point go? (a) 2.475 (b) 0.2475 (c) 24.75 (d) 247.5
  37. 37.0.79 × 3 — where does the decimal point go? (a) 0.0237 (b) 2.37 (c) 23.7 (d) 0.237
  38. 38.0.14 × 42 — where does the decimal point go? (a) 0.0588 (b) 58.8 (c) 0.588 (d) 5.88
  39. 39.6.9 × 41 — where does the decimal point go? (a) 2829 (b) 282.9 (c) 2.829 (d) 28.29
  40. 40.6.3 × 31 — where does the decimal point go? (a) 195.3 (b) 1953 (c) 1.953 (d) 19.53

Answer key

  1. 39.77
  2. 374.4
  3. 0.075
  4. 3.56
  5. 12.4
  6. 6.72
  7. 264.6
  8. 16.8
  9. 0.273
  10. 283.2
  11. 4.08
  12. 79.3
  13. 0.742
  14. 89.1
  15. 0.768
  16. 49.5
  17. 2.86
  18. 67.2
  19. 46.9
  20. 0.644
  21. 1.72
  22. 16.6
  23. 0.105
  24. 20.37
  25. 0.051
  26. 87.3
  27. 0.048
  28. 15.12
  29. 1.12
  30. 11.47
  31. 28.56
  32. 0.294
  33. 6.24
  34. 4.15
  35. 4.37
  36. 24.75
  37. 2.37
  38. 5.88
  39. 282.9
  40. 195.3

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