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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 19 · 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. 1.8.3 × 0.5 — where does the decimal point go? (a) 0.415 (b) 0.0415 (c) 41.5 (d) 4.15
  2. 2.0.89 × 3.7 — where does the decimal point go? (a) 0.3293 (b) 0.03293 (c) 32.93 (d) 3.293
  3. 3.0.71 × 9 — where does the decimal point go? (a) 63.9 (b) 6.39 (c) 0.0639 (d) 0.639
  4. 4.0.68 × 0.2 — where does the decimal point go? (a) 0.0136 (b) 0.00136 (c) 0.136 (d) 1.36
  5. 5.3.3 × 46 — where does the decimal point go? (a) 1518 (b) 15.18 (c) 1.518 (d) 151.8
  6. 6.0.49 × 1.5 — where does the decimal point go? (a) 0.0735 (b) 0.00735 (c) 0.735 (d) 7.35
  7. 7.5.2 × 2 — where does the decimal point go? (a) 10.4 (b) 1.04 (c) 104 (d) 0.104
  8. 8.0.24 × 4.1 — where does the decimal point go? (a) 0.0984 (b) 0.00984 (c) 9.84 (d) 0.984
  9. 9.7.5 × 4.5 — where does the decimal point go? (a) 3.375 (b) 33.75 (c) 0.3375 (d) 337.5
  10. 10.0.16 × 3 — where does the decimal point go? (a) 0.48 (b) 0.0048 (c) 4.8 (d) 0.048
  11. 11.0.72 × 0.2 — where does the decimal point go? (a) 0.00144 (b) 0.0144 (c) 0.144 (d) 1.44
  12. 12.4.9 × 0.3 — where does the decimal point go? (a) 14.7 (b) 0.147 (c) 1.47 (d) 0.0147
  13. 13.2.9 × 0.2 — where does the decimal point go? (a) 0.58 (b) 0.0058 (c) 5.8 (d) 0.058
  14. 14.0.43 × 0.2 — where does the decimal point go? (a) 0.0086 (b) 0.086 (c) 0.00086 (d) 0.86
  15. 15.0.13 × 4.2 — where does the decimal point go? (a) 5.46 (b) 0.0546 (c) 0.00546 (d) 0.546
  16. 16.6.3 × 5 — where does the decimal point go? (a) 315 (b) 31.5 (c) 0.315 (d) 3.15
  17. 17.3.3 × 1.1 — where does the decimal point go? (a) 3.63 (b) 36.3 (c) 0.0363 (d) 0.363
  18. 18.4.7 × 4.6 — where does the decimal point go? (a) 21.62 (b) 0.2162 (c) 2.162 (d) 216.2
  19. 19.0.77 × 0.3 — where does the decimal point go? (a) 0.231 (b) 0.00231 (c) 0.0231 (d) 2.31
  20. 20.5.2 × 4 — where does the decimal point go? (a) 2.08 (b) 208 (c) 20.8 (d) 0.208
  21. 21.8.9 × 4 — where does the decimal point go? (a) 0.356 (b) 3.56 (c) 356 (d) 35.6
  22. 22.0.74 × 26 — where does the decimal point go? (a) 0.1924 (b) 192.4 (c) 19.24 (d) 1.924
  23. 23.3.3 × 8 — where does the decimal point go? (a) 264 (b) 26.4 (c) 2.64 (d) 0.264
  24. 24.0.43 × 9 — where does the decimal point go? (a) 0.0387 (b) 38.7 (c) 3.87 (d) 0.387
  25. 25.7.1 × 0.6 — where does the decimal point go? (a) 0.0426 (b) 42.6 (c) 4.26 (d) 0.426
  26. 26.1.3 × 45 — where does the decimal point go? (a) 0.585 (b) 5.85 (c) 585 (d) 58.5
  27. 27.0.27 × 31 — where does the decimal point go? (a) 0.837 (b) 0.0837 (c) 8.37 (d) 83.7
  28. 28.0.74 × 1.7 — where does the decimal point go? (a) 0.01258 (b) 0.1258 (c) 12.58 (d) 1.258
  29. 29.1.6 × 0.3 — where does the decimal point go? (a) 0.048 (b) 0.48 (c) 0.0048 (d) 4.8
  30. 30.5.4 × 3.6 — where does the decimal point go? (a) 19.44 (b) 1.944 (c) 194.4 (d) 0.1944
  31. 31.3.2 × 0.6 — where does the decimal point go? (a) 0.0192 (b) 1.92 (c) 0.192 (d) 19.2
  32. 32.0.23 × 0.3 — where does the decimal point go? (a) 0.69 (b) 0.0069 (c) 0.00069 (d) 0.069
  33. 33.0.28 × 0.2 — where does the decimal point go? (a) 0.056 (b) 0.00056 (c) 0.56 (d) 0.0056
  34. 34.0.52 × 6 — where does the decimal point go? (a) 0.0312 (b) 3.12 (c) 31.2 (d) 0.312
  35. 35.8.4 × 2 — where does the decimal point go? (a) 168 (b) 0.168 (c) 1.68 (d) 16.8
  36. 36.0.35 × 0.3 — where does the decimal point go? (a) 0.00105 (b) 0.0105 (c) 1.05 (d) 0.105
  37. 37.5.1 × 35 — where does the decimal point go? (a) 1785 (b) 178.5 (c) 1.785 (d) 17.85
  38. 38.0.22 × 3.6 — where does the decimal point go? (a) 0.00792 (b) 0.0792 (c) 0.792 (d) 7.92
  39. 39.9.2 × 0.7 — where does the decimal point go? (a) 6.44 (b) 64.4 (c) 0.0644 (d) 0.644
  40. 40.0.56 × 0.3 — where does the decimal point go? (a) 0.0168 (b) 0.00168 (c) 1.68 (d) 0.168

Answer key

  1. 4.15
  2. 3.293
  3. 6.39
  4. 0.136
  5. 151.8
  6. 0.735
  7. 10.4
  8. 0.984
  9. 33.75
  10. 0.48
  11. 0.144
  12. 1.47
  13. 0.58
  14. 0.086
  15. 0.546
  16. 31.5
  17. 3.63
  18. 21.62
  19. 0.231
  20. 20.8
  21. 35.6
  22. 19.24
  23. 26.4
  24. 3.87
  25. 4.26
  26. 58.5
  27. 8.37
  28. 1.258
  29. 0.48
  30. 19.44
  31. 1.92
  32. 0.069
  33. 0.056
  34. 3.12
  35. 16.8
  36. 0.105
  37. 178.5
  38. 0.792
  39. 6.44
  40. 0.168

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