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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 437 · 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. 1.0.88 × 19 — where does the decimal point go? (a) 16.72 (b) 0.1672 (c) 167.2 (d) 1.672
  2. 2.9.8 × 4 — where does the decimal point go? (a) 3.92 (b) 39.2 (c) 392 (d) 0.392
  3. 3.5.9 × 3.1 — where does the decimal point go? (a) 18.29 (b) 1.829 (c) 0.1829 (d) 182.9
  4. 4.0.91 × 4 — where does the decimal point go? (a) 36.4 (b) 0.0364 (c) 3.64 (d) 0.364
  5. 5.0.82 × 4.6 — where does the decimal point go? (a) 0.03772 (b) 0.3772 (c) 37.72 (d) 3.772
  6. 6.3.1 × 0.7 — where does the decimal point go? (a) 0.0217 (b) 0.217 (c) 2.17 (d) 21.7
  7. 7.0.29 × 3.1 — where does the decimal point go? (a) 0.899 (b) 0.00899 (c) 8.99 (d) 0.0899
  8. 8.0.67 × 0.7 — where does the decimal point go? (a) 0.0469 (b) 0.00469 (c) 4.69 (d) 0.469
  9. 9.0.34 × 47 — where does the decimal point go? (a) 0.1598 (b) 159.8 (c) 15.98 (d) 1.598
  10. 10.0.53 × 1.9 — where does the decimal point go? (a) 0.1007 (b) 1.007 (c) 10.07 (d) 0.01007
  11. 11.0.56 × 0.9 — where does the decimal point go? (a) 0.0504 (b) 0.00504 (c) 0.504 (d) 5.04
  12. 12.0.27 × 1.9 — where does the decimal point go? (a) 0.00513 (b) 0.513 (c) 0.0513 (d) 5.13
  13. 13.0.13 × 3 — where does the decimal point go? (a) 0.039 (b) 0.0039 (c) 0.39 (d) 3.9
  14. 14.8.8 × 0.4 — where does the decimal point go? (a) 0.352 (b) 0.0352 (c) 3.52 (d) 35.2
  15. 15.8.9 × 0.4 — where does the decimal point go? (a) 3.56 (b) 0.356 (c) 35.6 (d) 0.0356
  16. 16.0.23 × 1.9 — where does the decimal point go? (a) 0.00437 (b) 4.37 (c) 0.437 (d) 0.0437
  17. 17.6.6 × 4.6 — where does the decimal point go? (a) 0.3036 (b) 3.036 (c) 303.6 (d) 30.36
  18. 18.0.54 × 0.4 — where does the decimal point go? (a) 2.16 (b) 0.00216 (c) 0.0216 (d) 0.216
  19. 19.0.16 × 42 — where does the decimal point go? (a) 6.72 (b) 0.672 (c) 67.2 (d) 0.0672
  20. 20.2.5 × 1.9 — where does the decimal point go? (a) 47.5 (b) 0.475 (c) 4.75 (d) 0.0475
  21. 21.6.5 × 9 — where does the decimal point go? (a) 0.585 (b) 5.85 (c) 585 (d) 58.5
  22. 22.0.69 × 3 — where does the decimal point go? (a) 20.7 (b) 0.0207 (c) 2.07 (d) 0.207
  23. 23.0.44 × 19 — where does the decimal point go? (a) 0.0836 (b) 8.36 (c) 83.6 (d) 0.836
  24. 24.0.18 × 0.4 — where does the decimal point go? (a) 0.00072 (b) 0.072 (c) 0.0072 (d) 0.72
  25. 25.2.6 × 29 — where does the decimal point go? (a) 754 (b) 0.754 (c) 7.54 (d) 75.4
  26. 26.3.7 × 0.3 — where does the decimal point go? (a) 0.111 (b) 11.1 (c) 0.0111 (d) 1.11
  27. 27.0.47 × 4 — where does the decimal point go? (a) 0.0188 (b) 18.8 (c) 0.188 (d) 1.88
  28. 28.0.63 × 6 — where does the decimal point go? (a) 0.378 (b) 0.0378 (c) 37.8 (d) 3.78
  29. 29.7.4 × 7 — where does the decimal point go? (a) 5.18 (b) 51.8 (c) 0.518 (d) 518
  30. 30.0.89 × 0.9 — where does the decimal point go? (a) 0.0801 (b) 0.00801 (c) 8.01 (d) 0.801
  31. 31.1.9 × 3 — where does the decimal point go? (a) 57 (b) 0.57 (c) 0.057 (d) 5.7
  32. 32.5.3 × 12 — where does the decimal point go? (a) 63.6 (b) 6.36 (c) 0.636 (d) 636
  33. 33.7.1 × 2 — where does the decimal point go? (a) 1.42 (b) 14.2 (c) 0.142 (d) 142
  34. 34.7.9 × 0.3 — where does the decimal point go? (a) 0.0237 (b) 2.37 (c) 0.237 (d) 23.7
  35. 35.0.46 × 2.1 — where does the decimal point go? (a) 9.66 (b) 0.966 (c) 0.0966 (d) 0.00966
  36. 36.0.16 × 3 — where does the decimal point go? (a) 0.0048 (b) 0.048 (c) 0.48 (d) 4.8
  37. 37.0.55 × 3 — where does the decimal point go? (a) 1.65 (b) 0.165 (c) 16.5 (d) 0.0165
  38. 38.5.3 × 0.9 — where does the decimal point go? (a) 0.477 (b) 0.0477 (c) 47.7 (d) 4.77
  39. 39.0.45 × 0.5 — where does the decimal point go? (a) 0.00225 (b) 0.0225 (c) 0.225 (d) 2.25
  40. 40.0.26 × 47 — where does the decimal point go? (a) 12.22 (b) 0.1222 (c) 1.222 (d) 122.2

Answer key

  1. 16.72
  2. 39.2
  3. 18.29
  4. 3.64
  5. 3.772
  6. 2.17
  7. 0.899
  8. 0.469
  9. 15.98
  10. 1.007
  11. 0.504
  12. 0.513
  13. 0.39
  14. 3.52
  15. 3.56
  16. 0.437
  17. 30.36
  18. 0.216
  19. 6.72
  20. 4.75
  21. 58.5
  22. 2.07
  23. 8.36
  24. 0.072
  25. 75.4
  26. 1.11
  27. 1.88
  28. 3.78
  29. 51.8
  30. 0.801
  31. 5.7
  32. 63.6
  33. 14.2
  34. 2.37
  35. 0.966
  36. 0.48
  37. 1.65
  38. 4.77
  39. 0.225
  40. 12.22

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