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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 230 · 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. 1.3.3 × 4 — where does the decimal point go? (a) 132 (b) 13.2 (c) 0.132 (d) 1.32
  2. 2.0.54 × 1.6 — where does the decimal point go? (a) 0.0864 (b) 0.00864 (c) 0.864 (d) 8.64
  3. 3.6.8 × 3.1 — where does the decimal point go? (a) 2.108 (b) 0.2108 (c) 21.08 (d) 210.8
  4. 4.0.99 × 22 — where does the decimal point go? (a) 21.78 (b) 0.2178 (c) 2.178 (d) 217.8
  5. 5.4.1 × 0.2 — where does the decimal point go? (a) 8.2 (b) 0.82 (c) 0.0082 (d) 0.082
  6. 6.1.7 × 29 — where does the decimal point go? (a) 0.493 (b) 49.3 (c) 493 (d) 4.93
  7. 7.3.7 × 4.3 — where does the decimal point go? (a) 15.91 (b) 159.1 (c) 1.591 (d) 0.1591
  8. 8.0.15 × 2.7 — where does the decimal point go? (a) 0.0405 (b) 0.405 (c) 4.05 (d) 0.00405
  9. 9.7.9 × 0.7 — where does the decimal point go? (a) 55.3 (b) 5.53 (c) 0.0553 (d) 0.553
  10. 10.0.34 × 9 — where does the decimal point go? (a) 0.0306 (b) 30.6 (c) 0.306 (d) 3.06
  11. 11.0.27 × 3 — where does the decimal point go? (a) 0.81 (b) 0.0081 (c) 0.081 (d) 8.1
  12. 12.2.3 × 37 — where does the decimal point go? (a) 0.851 (b) 851 (c) 8.51 (d) 85.1
  13. 13.3.9 × 0.6 — where does the decimal point go? (a) 23.4 (b) 0.234 (c) 2.34 (d) 0.0234
  14. 14.2.2 × 0.2 — where does the decimal point go? (a) 0.44 (b) 4.4 (c) 0.044 (d) 0.0044
  15. 15.0.57 × 1.7 — where does the decimal point go? (a) 0.969 (b) 0.0969 (c) 0.00969 (d) 9.69
  16. 16.0.63 × 2.5 — where does the decimal point go? (a) 0.01575 (b) 0.1575 (c) 15.75 (d) 1.575
  17. 17.7.5 × 11 — where does the decimal point go? (a) 825 (b) 82.5 (c) 0.825 (d) 8.25
  18. 18.0.33 × 0.2 — where does the decimal point go? (a) 0.066 (b) 0.0066 (c) 0.00066 (d) 0.66
  19. 19.0.53 × 9 — where does the decimal point go? (a) 4.77 (b) 0.477 (c) 0.0477 (d) 47.7
  20. 20.8.7 × 5 — where does the decimal point go? (a) 435 (b) 0.435 (c) 4.35 (d) 43.5
  21. 21.0.54 × 1.7 — where does the decimal point go? (a) 0.00918 (b) 9.18 (c) 0.918 (d) 0.0918
  22. 22.0.13 × 37 — where does the decimal point go? (a) 0.481 (b) 4.81 (c) 0.0481 (d) 48.1
  23. 23.0.38 × 3 — where does the decimal point go? (a) 0.0114 (b) 11.4 (c) 0.114 (d) 1.14
  24. 24.9.7 × 37 — where does the decimal point go? (a) 3.589 (b) 35.89 (c) 358.9 (d) 3589
  25. 25.0.54 × 3.6 — where does the decimal point go? (a) 0.1944 (b) 0.01944 (c) 19.44 (d) 1.944
  26. 26.6.1 × 24 — where does the decimal point go? (a) 146.4 (b) 14.64 (c) 1.464 (d) 1464
  27. 27.9.6 × 2 — where does the decimal point go? (a) 1.92 (b) 19.2 (c) 0.192 (d) 192
  28. 28.8.9 × 4.2 — where does the decimal point go? (a) 3.738 (b) 0.3738 (c) 373.8 (d) 37.38
  29. 29.0.25 × 0.9 — where does the decimal point go? (a) 0.225 (b) 0.0225 (c) 0.00225 (d) 2.25
  30. 30.0.32 × 6 — where does the decimal point go? (a) 19.2 (b) 0.0192 (c) 0.192 (d) 1.92
  31. 31.0.76 × 1.2 — where does the decimal point go? (a) 0.912 (b) 0.0912 (c) 0.00912 (d) 9.12
  32. 32.0.12 × 36 — where does the decimal point go? (a) 0.0432 (b) 4.32 (c) 0.432 (d) 43.2
  33. 33.9.4 × 4.9 — where does the decimal point go? (a) 0.4606 (b) 4.606 (c) 460.6 (d) 46.06
  34. 34.7.6 × 3 — where does the decimal point go? (a) 228 (b) 2.28 (c) 22.8 (d) 0.228
  35. 35.4.5 × 9 — where does the decimal point go? (a) 0.405 (b) 40.5 (c) 405 (d) 4.05
  36. 36.1.2 × 0.2 — where does the decimal point go? (a) 0.024 (b) 0.24 (c) 0.0024 (d) 2.4
  37. 37.1.7 × 0.9 — where does the decimal point go? (a) 0.0153 (b) 0.153 (c) 15.3 (d) 1.53
  38. 38.0.16 × 4 — where does the decimal point go? (a) 0.064 (b) 6.4 (c) 0.64 (d) 0.0064
  39. 39.0.21 × 0.5 — where does the decimal point go? (a) 1.05 (b) 0.00105 (c) 0.105 (d) 0.0105
  40. 40.0.58 × 3.6 — where does the decimal point go? (a) 2.088 (b) 0.2088 (c) 0.02088 (d) 20.88

Answer key

  1. 13.2
  2. 0.864
  3. 21.08
  4. 21.78
  5. 0.82
  6. 49.3
  7. 15.91
  8. 0.405
  9. 5.53
  10. 3.06
  11. 0.81
  12. 85.1
  13. 2.34
  14. 0.44
  15. 0.969
  16. 1.575
  17. 82.5
  18. 0.066
  19. 4.77
  20. 43.5
  21. 0.918
  22. 4.81
  23. 1.14
  24. 358.9
  25. 1.944
  26. 146.4
  27. 19.2
  28. 37.38
  29. 0.225
  30. 1.92
  31. 0.912
  32. 4.32
  33. 46.06
  34. 22.8
  35. 40.5
  36. 0.24
  37. 1.53
  38. 0.64
  39. 0.105
  40. 2.088

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