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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 132 · 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. 1.2.2 × 2.8 — where does the decimal point go? (a) 61.6 (b) 0.0616 (c) 0.616 (d) 6.16
  2. 2.0.84 × 8 — where does the decimal point go? (a) 67.2 (b) 0.0672 (c) 6.72 (d) 0.672
  3. 3.0.98 × 3 — where does the decimal point go? (a) 29.4 (b) 2.94 (c) 0.0294 (d) 0.294
  4. 4.0.65 × 0.7 — where does the decimal point go? (a) 0.00455 (b) 4.55 (c) 0.455 (d) 0.0455
  5. 5.8.4 × 0.2 — where does the decimal point go? (a) 0.168 (b) 0.0168 (c) 16.8 (d) 1.68
  6. 6.0.52 × 3.8 — where does the decimal point go? (a) 1.976 (b) 0.01976 (c) 19.76 (d) 0.1976
  7. 7.6.9 × 0.3 — where does the decimal point go? (a) 0.0207 (b) 2.07 (c) 20.7 (d) 0.207
  8. 8.0.86 × 2 — where does the decimal point go? (a) 17.2 (b) 0.0172 (c) 1.72 (d) 0.172
  9. 9.1.2 × 3.6 — where does the decimal point go? (a) 4.32 (b) 0.432 (c) 43.2 (d) 0.0432
  10. 10.0.57 × 0.5 — where does the decimal point go? (a) 0.0285 (b) 0.285 (c) 0.00285 (d) 2.85
  11. 11.6.6 × 4 — where does the decimal point go? (a) 264 (b) 26.4 (c) 0.264 (d) 2.64
  12. 12.0.76 × 2.4 — where does the decimal point go? (a) 0.1824 (b) 1.824 (c) 18.24 (d) 0.01824
  13. 13.0.56 × 0.4 — where does the decimal point go? (a) 0.224 (b) 2.24 (c) 0.00224 (d) 0.0224
  14. 14.0.51 × 0.2 — where does the decimal point go? (a) 0.00102 (b) 1.02 (c) 0.0102 (d) 0.102
  15. 15.0.24 × 43 — where does the decimal point go? (a) 0.1032 (b) 10.32 (c) 1.032 (d) 103.2
  16. 16.8.6 × 0.4 — where does the decimal point go? (a) 0.344 (b) 3.44 (c) 34.4 (d) 0.0344
  17. 17.0.13 × 0.6 — where does the decimal point go? (a) 0.078 (b) 0.00078 (c) 0.78 (d) 0.0078
  18. 18.7.7 × 45 — where does the decimal point go? (a) 3465 (b) 34.65 (c) 3.465 (d) 346.5
  19. 19.0.76 × 1.8 — where does the decimal point go? (a) 0.1368 (b) 0.01368 (c) 1.368 (d) 13.68
  20. 20.3.4 × 33 — where does the decimal point go? (a) 1122 (b) 112.2 (c) 1.122 (d) 11.22
  21. 21.8.5 × 27 — where does the decimal point go? (a) 229.5 (b) 22.95 (c) 2.295 (d) 2295
  22. 22.0.83 × 3 — where does the decimal point go? (a) 24.9 (b) 2.49 (c) 0.0249 (d) 0.249
  23. 23.0.41 × 16 — where does the decimal point go? (a) 0.656 (b) 6.56 (c) 65.6 (d) 0.0656
  24. 24.8.3 × 0.3 — where does the decimal point go? (a) 2.49 (b) 0.0249 (c) 0.249 (d) 24.9
  25. 25.0.13 × 7 — where does the decimal point go? (a) 0.91 (b) 9.1 (c) 0.0091 (d) 0.091
  26. 26.8.7 × 0.4 — where does the decimal point go? (a) 0.0348 (b) 3.48 (c) 34.8 (d) 0.348
  27. 27.2.8 × 31 — where does the decimal point go? (a) 86.8 (b) 0.868 (c) 868 (d) 8.68
  28. 28.4.9 × 0.6 — where does the decimal point go? (a) 2.94 (b) 0.294 (c) 29.4 (d) 0.0294
  29. 29.0.68 × 8 — where does the decimal point go? (a) 0.544 (b) 54.4 (c) 0.0544 (d) 5.44
  30. 30.4.8 × 14 — where does the decimal point go? (a) 67.2 (b) 6.72 (c) 672 (d) 0.672
  31. 31.6.6 × 4.6 — where does the decimal point go? (a) 0.3036 (b) 303.6 (c) 30.36 (d) 3.036
  32. 32.5.6 × 0.6 — where does the decimal point go? (a) 0.0336 (b) 0.336 (c) 3.36 (d) 33.6
  33. 33.0.66 × 33 — where does the decimal point go? (a) 21.78 (b) 0.2178 (c) 2.178 (d) 217.8
  34. 34.7.4 × 6 — where does the decimal point go? (a) 444 (b) 4.44 (c) 0.444 (d) 44.4
  35. 35.3.2 × 2 — where does the decimal point go? (a) 0.64 (b) 6.4 (c) 64 (d) 0.064
  36. 36.0.81 × 2.2 — where does the decimal point go? (a) 0.1782 (b) 17.82 (c) 0.01782 (d) 1.782
  37. 37.0.79 × 0.3 — where does the decimal point go? (a) 2.37 (b) 0.237 (c) 0.0237 (d) 0.00237
  38. 38.0.61 × 7 — where does the decimal point go? (a) 4.27 (b) 0.0427 (c) 0.427 (d) 42.7
  39. 39.3.3 × 0.8 — where does the decimal point go? (a) 0.264 (b) 26.4 (c) 2.64 (d) 0.0264
  40. 40.0.59 × 3.5 — where does the decimal point go? (a) 20.65 (b) 0.02065 (c) 2.065 (d) 0.2065

Answer key

  1. 6.16
  2. 6.72
  3. 2.94
  4. 0.455
  5. 1.68
  6. 1.976
  7. 2.07
  8. 1.72
  9. 4.32
  10. 0.285
  11. 26.4
  12. 1.824
  13. 0.224
  14. 0.102
  15. 10.32
  16. 3.44
  17. 0.078
  18. 346.5
  19. 1.368
  20. 112.2
  21. 229.5
  22. 2.49
  23. 6.56
  24. 2.49
  25. 0.91
  26. 3.48
  27. 86.8
  28. 2.94
  29. 5.44
  30. 67.2
  31. 30.36
  32. 3.36
  33. 21.78
  34. 44.4
  35. 6.4
  36. 1.782
  37. 0.237
  38. 4.27
  39. 2.64
  40. 2.065

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