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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 596 · 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. 1.5.7 × 25 — where does the decimal point go? (a) 14.25 (b) 142.5 (c) 1425 (d) 1.425
  2. 2.0.27 × 0.5 — where does the decimal point go? (a) 0.00135 (b) 0.135 (c) 1.35 (d) 0.0135
  3. 3.4.7 × 0.3 — where does the decimal point go? (a) 0.141 (b) 14.1 (c) 1.41 (d) 0.0141
  4. 4.0.23 × 2.1 — where does the decimal point go? (a) 0.483 (b) 0.00483 (c) 0.0483 (d) 4.83
  5. 5.0.62 × 0.8 — where does the decimal point go? (a) 0.496 (b) 4.96 (c) 0.0496 (d) 0.00496
  6. 6.6.6 × 27 — where does the decimal point go? (a) 1782 (b) 1.782 (c) 178.2 (d) 17.82
  7. 7.7.9 × 0.9 — where does the decimal point go? (a) 0.0711 (b) 71.1 (c) 0.711 (d) 7.11
  8. 8.0.76 × 7 — where does the decimal point go? (a) 5.32 (b) 0.532 (c) 0.0532 (d) 53.2
  9. 9.0.36 × 0.8 — where does the decimal point go? (a) 0.0288 (b) 0.288 (c) 0.00288 (d) 2.88
  10. 10.5.6 × 6 — where does the decimal point go? (a) 0.336 (b) 33.6 (c) 336 (d) 3.36
  11. 11.5.9 × 0.6 — where does the decimal point go? (a) 3.54 (b) 0.354 (c) 35.4 (d) 0.0354
  12. 12.3.2 × 44 — where does the decimal point go? (a) 1.408 (b) 1408 (c) 14.08 (d) 140.8
  13. 13.8.2 × 0.8 — where does the decimal point go? (a) 65.6 (b) 6.56 (c) 0.0656 (d) 0.656
  14. 14.0.59 × 0.8 — where does the decimal point go? (a) 0.0472 (b) 0.472 (c) 0.00472 (d) 4.72
  15. 15.0.75 × 3 — where does the decimal point go? (a) 2.25 (b) 0.0225 (c) 22.5 (d) 0.225
  16. 16.0.62 × 3 — where does the decimal point go? (a) 1.86 (b) 18.6 (c) 0.186 (d) 0.0186
  17. 17.9.8 × 12 — where does the decimal point go? (a) 117.6 (b) 11.76 (c) 1.176 (d) 1176
  18. 18.8.1 × 2 — where does the decimal point go? (a) 16.2 (b) 0.162 (c) 162 (d) 1.62
  19. 19.0.18 × 0.3 — where does the decimal point go? (a) 0.0054 (b) 0.54 (c) 0.054 (d) 0.00054
  20. 20.0.81 × 4 — where does the decimal point go? (a) 0.0324 (b) 32.4 (c) 3.24 (d) 0.324
  21. 21.6.3 × 4.3 — where does the decimal point go? (a) 2.709 (b) 270.9 (c) 27.09 (d) 0.2709
  22. 22.0.93 × 0.6 — where does the decimal point go? (a) 0.00558 (b) 0.0558 (c) 5.58 (d) 0.558
  23. 23.0.64 × 4.6 — where does the decimal point go? (a) 0.2944 (b) 2.944 (c) 29.44 (d) 0.02944
  24. 24.0.19 × 7 — where does the decimal point go? (a) 13.3 (b) 0.133 (c) 0.0133 (d) 1.33
  25. 25.0.92 × 1.6 — where does the decimal point go? (a) 0.1472 (b) 14.72 (c) 1.472 (d) 0.01472
  26. 26.5.3 × 0.7 — where does the decimal point go? (a) 0.0371 (b) 3.71 (c) 0.371 (d) 37.1
  27. 27.0.26 × 3 — where does the decimal point go? (a) 0.0078 (b) 7.8 (c) 0.78 (d) 0.078
  28. 28.0.46 × 0.3 — where does the decimal point go? (a) 0.0138 (b) 0.138 (c) 1.38 (d) 0.00138
  29. 29.0.54 × 0.4 — where does the decimal point go? (a) 0.0216 (b) 2.16 (c) 0.00216 (d) 0.216
  30. 30.0.61 × 6 — where does the decimal point go? (a) 0.0366 (b) 0.366 (c) 36.6 (d) 3.66
  31. 31.0.23 × 33 — where does the decimal point go? (a) 0.759 (b) 0.0759 (c) 7.59 (d) 75.9
  32. 32.0.17 × 0.9 — where does the decimal point go? (a) 0.00153 (b) 1.53 (c) 0.0153 (d) 0.153
  33. 33.3.4 × 0.2 — where does the decimal point go? (a) 0.68 (b) 6.8 (c) 0.0068 (d) 0.068
  34. 34.8.2 × 4 — where does the decimal point go? (a) 328 (b) 0.328 (c) 32.8 (d) 3.28
  35. 35.0.64 × 0.2 — where does the decimal point go? (a) 1.28 (b) 0.00128 (c) 0.128 (d) 0.0128
  36. 36.8.8 × 3 — where does the decimal point go? (a) 2.64 (b) 26.4 (c) 0.264 (d) 264
  37. 37.5.4 × 7 — where does the decimal point go? (a) 37.8 (b) 3.78 (c) 0.378 (d) 378
  38. 38.0.79 × 31 — where does the decimal point go? (a) 0.2449 (b) 244.9 (c) 2.449 (d) 24.49
  39. 39.0.53 × 3 — where does the decimal point go? (a) 0.0159 (b) 1.59 (c) 0.159 (d) 15.9
  40. 40.0.47 × 9 — where does the decimal point go? (a) 42.3 (b) 0.423 (c) 4.23 (d) 0.0423

Answer key

  1. 142.5
  2. 0.135
  3. 1.41
  4. 0.483
  5. 0.496
  6. 178.2
  7. 7.11
  8. 5.32
  9. 0.288
  10. 33.6
  11. 3.54
  12. 140.8
  13. 6.56
  14. 0.472
  15. 2.25
  16. 1.86
  17. 117.6
  18. 16.2
  19. 0.054
  20. 3.24
  21. 27.09
  22. 0.558
  23. 2.944
  24. 1.33
  25. 1.472
  26. 3.71
  27. 0.78
  28. 0.138
  29. 0.216
  30. 3.66
  31. 7.59
  32. 0.153
  33. 0.68
  34. 32.8
  35. 0.128
  36. 26.4
  37. 37.8
  38. 24.49
  39. 1.59
  40. 4.23

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