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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 183 · 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. 1.8.5 × 4.1 — where does the decimal point go? (a) 34.85 (b) 3.485 (c) 348.5 (d) 0.3485
  2. 2.8.5 × 45 — where does the decimal point go? (a) 38.25 (b) 382.5 (c) 3825 (d) 3.825
  3. 3.0.33 × 47 — where does the decimal point go? (a) 155.1 (b) 1.551 (c) 15.51 (d) 0.1551
  4. 4.9.5 × 0.5 — where does the decimal point go? (a) 0.475 (b) 0.0475 (c) 47.5 (d) 4.75
  5. 5.2.5 × 2.5 — where does the decimal point go? (a) 0.0625 (b) 62.5 (c) 6.25 (d) 0.625
  6. 6.0.16 × 29 — where does the decimal point go? (a) 46.4 (b) 0.0464 (c) 0.464 (d) 4.64
  7. 7.0.44 × 4 — where does the decimal point go? (a) 0.176 (b) 0.0176 (c) 1.76 (d) 17.6
  8. 8.0.98 × 44 — where does the decimal point go? (a) 0.4312 (b) 431.2 (c) 4.312 (d) 43.12
  9. 9.7.5 × 4.9 — where does the decimal point go? (a) 367.5 (b) 3.675 (c) 36.75 (d) 0.3675
  10. 10.2.8 × 9 — where does the decimal point go? (a) 0.252 (b) 25.2 (c) 252 (d) 2.52
  11. 11.0.51 × 0.2 — where does the decimal point go? (a) 0.102 (b) 0.00102 (c) 1.02 (d) 0.0102
  12. 12.0.17 × 0.5 — where does the decimal point go? (a) 0.0085 (b) 0.085 (c) 0.00085 (d) 0.85
  13. 13.0.69 × 1.9 — where does the decimal point go? (a) 0.1311 (b) 13.11 (c) 0.01311 (d) 1.311
  14. 14.0.75 × 31 — where does the decimal point go? (a) 232.5 (b) 2.325 (c) 23.25 (d) 0.2325
  15. 15.5.3 × 0.3 — where does the decimal point go? (a) 15.9 (b) 0.0159 (c) 1.59 (d) 0.159
  16. 16.3.9 × 3 — where does the decimal point go? (a) 1.17 (b) 11.7 (c) 0.117 (d) 117
  17. 17.9.3 × 1.3 — where does the decimal point go? (a) 120.9 (b) 1.209 (c) 12.09 (d) 0.1209
  18. 18.8.3 × 1.8 — where does the decimal point go? (a) 0.1494 (b) 149.4 (c) 14.94 (d) 1.494
  19. 19.0.94 × 3.3 — where does the decimal point go? (a) 31.02 (b) 0.3102 (c) 0.03102 (d) 3.102
  20. 20.0.79 × 7 — where does the decimal point go? (a) 0.553 (b) 5.53 (c) 0.0553 (d) 55.3
  21. 21.0.49 × 43 — where does the decimal point go? (a) 21.07 (b) 0.2107 (c) 2.107 (d) 210.7
  22. 22.0.24 × 28 — where does the decimal point go? (a) 67.2 (b) 6.72 (c) 0.0672 (d) 0.672
  23. 23.0.13 × 1.5 — where does the decimal point go? (a) 0.195 (b) 0.0195 (c) 0.00195 (d) 1.95
  24. 24.0.22 × 0.2 — where does the decimal point go? (a) 0.00044 (b) 0.044 (c) 0.44 (d) 0.0044
  25. 25.0.27 × 43 — where does the decimal point go? (a) 0.1161 (b) 116.1 (c) 11.61 (d) 1.161
  26. 26.0.31 × 0.9 — where does the decimal point go? (a) 0.0279 (b) 0.279 (c) 0.00279 (d) 2.79
  27. 27.7.2 × 7 — where does the decimal point go? (a) 0.504 (b) 50.4 (c) 504 (d) 5.04
  28. 28.9.9 × 0.4 — where does the decimal point go? (a) 0.0396 (b) 39.6 (c) 3.96 (d) 0.396
  29. 29.7.9 × 3 — where does the decimal point go? (a) 23.7 (b) 0.237 (c) 237 (d) 2.37
  30. 30.1.4 × 24 — where does the decimal point go? (a) 3.36 (b) 33.6 (c) 0.336 (d) 336
  31. 31.0.47 × 2 — where does the decimal point go? (a) 0.0094 (b) 9.4 (c) 0.094 (d) 0.94
  32. 32.0.45 × 4.9 — where does the decimal point go? (a) 22.05 (b) 2.205 (c) 0.02205 (d) 0.2205
  33. 33.1.6 × 4.2 — where does the decimal point go? (a) 6.72 (b) 0.0672 (c) 67.2 (d) 0.672
  34. 34.6.5 × 5 — where does the decimal point go? (a) 3.25 (b) 325 (c) 32.5 (d) 0.325
  35. 35.0.68 × 31 — where does the decimal point go? (a) 21.08 (b) 210.8 (c) 0.2108 (d) 2.108
  36. 36.8.9 × 4.5 — where does the decimal point go? (a) 0.4005 (b) 40.05 (c) 400.5 (d) 4.005
  37. 37.0.83 × 15 — where does the decimal point go? (a) 1.245 (b) 12.45 (c) 124.5 (d) 0.1245
  38. 38.0.21 × 4.9 — where does the decimal point go? (a) 1.029 (b) 0.1029 (c) 10.29 (d) 0.01029
  39. 39.1.6 × 4 — where does the decimal point go? (a) 64 (b) 0.64 (c) 0.064 (d) 6.4
  40. 40.1.8 × 0.7 — where does the decimal point go? (a) 1.26 (b) 12.6 (c) 0.126 (d) 0.0126

Answer key

  1. 34.85
  2. 382.5
  3. 15.51
  4. 4.75
  5. 6.25
  6. 4.64
  7. 1.76
  8. 43.12
  9. 36.75
  10. 25.2
  11. 0.102
  12. 0.085
  13. 1.311
  14. 23.25
  15. 1.59
  16. 11.7
  17. 12.09
  18. 14.94
  19. 3.102
  20. 5.53
  21. 21.07
  22. 6.72
  23. 0.195
  24. 0.044
  25. 11.61
  26. 0.279
  27. 50.4
  28. 3.96
  29. 23.7
  30. 33.6
  31. 0.94
  32. 2.205
  33. 6.72
  34. 32.5
  35. 21.08
  36. 40.05
  37. 12.45
  38. 1.029
  39. 6.4
  40. 1.26

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