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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 35 · 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. 1.0.75 × 5 — where does the decimal point go? (a) 3.75 (b) 0.0375 (c) 37.5 (d) 0.375
  2. 2.0.32 × 9 — where does the decimal point go? (a) 2.88 (b) 0.0288 (c) 0.288 (d) 28.8
  3. 3.0.14 × 2 — where does the decimal point go? (a) 0.028 (b) 0.0028 (c) 0.28 (d) 2.8
  4. 4.0.86 × 3.6 — where does the decimal point go? (a) 0.03096 (b) 0.3096 (c) 3.096 (d) 30.96
  5. 5.1.8 × 1.9 — where does the decimal point go? (a) 3.42 (b) 0.0342 (c) 0.342 (d) 34.2
  6. 6.0.77 × 7 — where does the decimal point go? (a) 0.539 (b) 5.39 (c) 0.0539 (d) 53.9
  7. 7.0.92 × 6 — where does the decimal point go? (a) 55.2 (b) 0.0552 (c) 5.52 (d) 0.552
  8. 8.0.12 × 0.2 — where does the decimal point go? (a) 0.024 (b) 0.24 (c) 0.0024 (d) 0.00024
  9. 9.0.79 × 47 — where does the decimal point go? (a) 371.3 (b) 3.713 (c) 37.13 (d) 0.3713
  10. 10.4.8 × 27 — where does the decimal point go? (a) 1296 (b) 129.6 (c) 1.296 (d) 12.96
  11. 11.0.92 × 4 — where does the decimal point go? (a) 36.8 (b) 3.68 (c) 0.0368 (d) 0.368
  12. 12.0.88 × 36 — where does the decimal point go? (a) 0.3168 (b) 3.168 (c) 31.68 (d) 316.8
  13. 13.0.21 × 7 — where does the decimal point go? (a) 0.147 (b) 14.7 (c) 0.0147 (d) 1.47
  14. 14.0.71 × 3.5 — where does the decimal point go? (a) 24.85 (b) 0.2485 (c) 2.485 (d) 0.02485
  15. 15.1.5 × 3.5 — where does the decimal point go? (a) 0.525 (b) 52.5 (c) 0.0525 (d) 5.25
  16. 16.0.59 × 4.3 — where does the decimal point go? (a) 0.02537 (b) 25.37 (c) 2.537 (d) 0.2537
  17. 17.8.8 × 3.2 — where does the decimal point go? (a) 281.6 (b) 2.816 (c) 28.16 (d) 0.2816
  18. 18.0.15 × 9 — where does the decimal point go? (a) 1.35 (b) 0.135 (c) 13.5 (d) 0.0135
  19. 19.0.19 × 3.1 — where does the decimal point go? (a) 5.89 (b) 0.589 (c) 0.0589 (d) 0.00589
  20. 20.6.1 × 4.9 — where does the decimal point go? (a) 0.2989 (b) 2.989 (c) 298.9 (d) 29.89
  21. 21.0.67 × 0.8 — where does the decimal point go? (a) 0.0536 (b) 5.36 (c) 0.536 (d) 0.00536
  22. 22.1.8 × 8 — where does the decimal point go? (a) 1.44 (b) 14.4 (c) 0.144 (d) 144
  23. 23.4.5 × 7 — where does the decimal point go? (a) 3.15 (b) 315 (c) 31.5 (d) 0.315
  24. 24.1.7 × 3 — where does the decimal point go? (a) 51 (b) 0.51 (c) 5.1 (d) 0.051
  25. 25.3.4 × 8 — where does the decimal point go? (a) 27.2 (b) 272 (c) 2.72 (d) 0.272
  26. 26.4.3 × 5 — where does the decimal point go? (a) 215 (b) 0.215 (c) 2.15 (d) 21.5
  27. 27.0.74 × 4.1 — where does the decimal point go? (a) 0.03034 (b) 0.3034 (c) 3.034 (d) 30.34
  28. 28.0.28 × 0.4 — where does the decimal point go? (a) 0.0112 (b) 1.12 (c) 0.00112 (d) 0.112
  29. 29.5.1 × 3.5 — where does the decimal point go? (a) 0.1785 (b) 1.785 (c) 17.85 (d) 178.5
  30. 30.7.8 × 9 — where does the decimal point go? (a) 0.702 (b) 7.02 (c) 702 (d) 70.2
  31. 31.0.98 × 3.3 — where does the decimal point go? (a) 32.34 (b) 0.3234 (c) 0.03234 (d) 3.234
  32. 32.0.22 × 1.3 — where does the decimal point go? (a) 0.0286 (b) 2.86 (c) 0.00286 (d) 0.286
  33. 33.7.1 × 0.7 — where does the decimal point go? (a) 49.7 (b) 4.97 (c) 0.497 (d) 0.0497
  34. 34.0.49 × 11 — where does the decimal point go? (a) 0.539 (b) 5.39 (c) 0.0539 (d) 53.9
  35. 35.0.57 × 43 — where does the decimal point go? (a) 2.451 (b) 245.1 (c) 24.51 (d) 0.2451
  36. 36.0.97 × 0.3 — where does the decimal point go? (a) 0.291 (b) 0.00291 (c) 0.0291 (d) 2.91
  37. 37.0.98 × 3 — where does the decimal point go? (a) 2.94 (b) 0.294 (c) 0.0294 (d) 29.4
  38. 38.0.59 × 3 — where does the decimal point go? (a) 0.177 (b) 17.7 (c) 1.77 (d) 0.0177
  39. 39.0.33 × 8 — where does the decimal point go? (a) 0.264 (b) 0.0264 (c) 2.64 (d) 26.4
  40. 40.0.32 × 0.8 — where does the decimal point go? (a) 2.56 (b) 0.0256 (c) 0.00256 (d) 0.256

Answer key

  1. 3.75
  2. 2.88
  3. 0.28
  4. 3.096
  5. 3.42
  6. 5.39
  7. 5.52
  8. 0.024
  9. 37.13
  10. 129.6
  11. 3.68
  12. 31.68
  13. 1.47
  14. 2.485
  15. 5.25
  16. 2.537
  17. 28.16
  18. 1.35
  19. 0.589
  20. 29.89
  21. 0.536
  22. 14.4
  23. 31.5
  24. 5.1
  25. 27.2
  26. 21.5
  27. 3.034
  28. 0.112
  29. 17.85
  30. 70.2
  31. 3.234
  32. 0.286
  33. 4.97
  34. 5.39
  35. 24.51
  36. 0.291
  37. 2.94
  38. 1.77
  39. 2.64
  40. 0.256

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