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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 313 · 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. 1.3.6 × 7 — where does the decimal point go? (a) 2.52 (b) 0.252 (c) 25.2 (d) 252
  2. 2.7.7 × 1.1 — where does the decimal point go? (a) 0.847 (b) 8.47 (c) 84.7 (d) 0.0847
  3. 3.0.47 × 4 — where does the decimal point go? (a) 0.188 (b) 0.0188 (c) 1.88 (d) 18.8
  4. 4.9.7 × 9 — where does the decimal point go? (a) 0.873 (b) 87.3 (c) 8.73 (d) 873
  5. 5.1.7 × 1.3 — where does the decimal point go? (a) 22.1 (b) 0.221 (c) 0.0221 (d) 2.21
  6. 6.4.1 × 8 — where does the decimal point go? (a) 32.8 (b) 3.28 (c) 328 (d) 0.328
  7. 7.8.6 × 11 — where does the decimal point go? (a) 0.946 (b) 9.46 (c) 94.6 (d) 946
  8. 8.0.33 × 41 — where does the decimal point go? (a) 1.353 (b) 135.3 (c) 0.1353 (d) 13.53
  9. 9.0.31 × 15 — where does the decimal point go? (a) 0.0465 (b) 46.5 (c) 4.65 (d) 0.465
  10. 10.2.7 × 0.4 — where does the decimal point go? (a) 0.0108 (b) 0.108 (c) 1.08 (d) 10.8
  11. 11.9.9 × 37 — where does the decimal point go? (a) 3.663 (b) 36.63 (c) 366.3 (d) 3663
  12. 12.3.8 × 3.1 — where does the decimal point go? (a) 1.178 (b) 117.8 (c) 11.78 (d) 0.1178
  13. 13.0.82 × 18 — where does the decimal point go? (a) 1.476 (b) 147.6 (c) 14.76 (d) 0.1476
  14. 14.0.23 × 3.9 — where does the decimal point go? (a) 0.897 (b) 0.0897 (c) 0.00897 (d) 8.97
  15. 15.0.76 × 0.9 — where does the decimal point go? (a) 6.84 (b) 0.684 (c) 0.00684 (d) 0.0684
  16. 16.5.1 × 19 — where does the decimal point go? (a) 0.969 (b) 9.69 (c) 969 (d) 96.9
  17. 17.0.24 × 7 — where does the decimal point go? (a) 16.8 (b) 0.0168 (c) 1.68 (d) 0.168
  18. 18.0.14 × 2.2 — where does the decimal point go? (a) 0.00308 (b) 0.308 (c) 0.0308 (d) 3.08
  19. 19.4.4 × 9 — where does the decimal point go? (a) 0.396 (b) 39.6 (c) 396 (d) 3.96
  20. 20.0.79 × 0.8 — where does the decimal point go? (a) 0.00632 (b) 0.632 (c) 0.0632 (d) 6.32
  21. 21.7.9 × 18 — where does the decimal point go? (a) 14.22 (b) 1.422 (c) 1422 (d) 142.2
  22. 22.2.8 × 0.3 — where does the decimal point go? (a) 0.84 (b) 0.084 (c) 8.4 (d) 0.0084
  23. 23.0.83 × 4.5 — where does the decimal point go? (a) 0.03735 (b) 37.35 (c) 0.3735 (d) 3.735
  24. 24.0.75 × 5 — where does the decimal point go? (a) 0.375 (b) 0.0375 (c) 3.75 (d) 37.5
  25. 25.9.8 × 0.2 — where does the decimal point go? (a) 0.196 (b) 0.0196 (c) 1.96 (d) 19.6
  26. 26.2.6 × 8 — where does the decimal point go? (a) 0.208 (b) 208 (c) 2.08 (d) 20.8
  27. 27.2.3 × 33 — where does the decimal point go? (a) 0.759 (b) 759 (c) 7.59 (d) 75.9
  28. 28.2.2 × 4 — where does the decimal point go? (a) 88 (b) 0.088 (c) 0.88 (d) 8.8
  29. 29.0.14 × 1.7 — where does the decimal point go? (a) 0.238 (b) 0.0238 (c) 2.38 (d) 0.00238
  30. 30.0.81 × 0.5 — where does the decimal point go? (a) 4.05 (b) 0.405 (c) 0.00405 (d) 0.0405
  31. 31.0.21 × 5 — where does the decimal point go? (a) 0.105 (b) 10.5 (c) 0.0105 (d) 1.05
  32. 32.2.3 × 0.4 — where does the decimal point go? (a) 0.92 (b) 0.092 (c) 0.0092 (d) 9.2
  33. 33.3.6 × 4 — where does the decimal point go? (a) 144 (b) 1.44 (c) 0.144 (d) 14.4
  34. 34.7.4 × 7 — where does the decimal point go? (a) 518 (b) 0.518 (c) 5.18 (d) 51.8
  35. 35.4.3 × 0.7 — where does the decimal point go? (a) 3.01 (b) 0.301 (c) 0.0301 (d) 30.1
  36. 36.1.7 × 4 — where does the decimal point go? (a) 68 (b) 6.8 (c) 0.68 (d) 0.068
  37. 37.1.2 × 41 — where does the decimal point go? (a) 492 (b) 4.92 (c) 49.2 (d) 0.492
  38. 38.9.7 × 1.9 — where does the decimal point go? (a) 18.43 (b) 1.843 (c) 184.3 (d) 0.1843
  39. 39.0.44 × 9 — where does the decimal point go? (a) 0.396 (b) 3.96 (c) 39.6 (d) 0.0396
  40. 40.8.1 × 2 — where does the decimal point go? (a) 0.162 (b) 162 (c) 1.62 (d) 16.2

Answer key

  1. 25.2
  2. 8.47
  3. 1.88
  4. 87.3
  5. 2.21
  6. 32.8
  7. 94.6
  8. 13.53
  9. 4.65
  10. 1.08
  11. 366.3
  12. 11.78
  13. 14.76
  14. 0.897
  15. 0.684
  16. 96.9
  17. 1.68
  18. 0.308
  19. 39.6
  20. 0.632
  21. 142.2
  22. 0.84
  23. 3.735
  24. 3.75
  25. 1.96
  26. 20.8
  27. 75.9
  28. 8.8
  29. 0.238
  30. 0.405
  31. 1.05
  32. 0.92
  33. 14.4
  34. 51.8
  35. 3.01
  36. 6.8
  37. 49.2
  38. 18.43
  39. 3.96
  40. 16.2

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