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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 99 · 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. 1.0.86 × 0.3 — where does the decimal point go? (a) 0.0258 (b) 0.258 (c) 0.00258 (d) 2.58
  2. 2.5.8 × 21 — where does the decimal point go? (a) 1.218 (b) 1218 (c) 121.8 (d) 12.18
  3. 3.3.3 × 26 — where does the decimal point go? (a) 0.858 (b) 8.58 (c) 858 (d) 85.8
  4. 4.0.14 × 2 — where does the decimal point go? (a) 0.28 (b) 0.028 (c) 2.8 (d) 0.0028
  5. 5.9.4 × 14 — where does the decimal point go? (a) 13.16 (b) 131.6 (c) 1316 (d) 1.316
  6. 6.8.4 × 1.7 — where does the decimal point go? (a) 142.8 (b) 0.1428 (c) 1.428 (d) 14.28
  7. 7.0.99 × 5 — where does the decimal point go? (a) 49.5 (b) 4.95 (c) 0.0495 (d) 0.495
  8. 8.0.59 × 2 — where does the decimal point go? (a) 11.8 (b) 1.18 (c) 0.118 (d) 0.0118
  9. 9.0.56 × 0.6 — where does the decimal point go? (a) 0.0336 (b) 0.336 (c) 0.00336 (d) 3.36
  10. 10.0.57 × 6 — where does the decimal point go? (a) 34.2 (b) 3.42 (c) 0.0342 (d) 0.342
  11. 11.0.57 × 34 — where does the decimal point go? (a) 1.938 (b) 19.38 (c) 193.8 (d) 0.1938
  12. 12.0.84 × 4.9 — where does the decimal point go? (a) 0.4116 (b) 0.04116 (c) 41.16 (d) 4.116
  13. 13.3.9 × 3.8 — where does the decimal point go? (a) 14.82 (b) 0.1482 (c) 148.2 (d) 1.482
  14. 14.0.49 × 0.8 — where does the decimal point go? (a) 0.00392 (b) 3.92 (c) 0.0392 (d) 0.392
  15. 15.1.3 × 41 — where does the decimal point go? (a) 0.533 (b) 53.3 (c) 5.33 (d) 533
  16. 16.0.18 × 8 — where does the decimal point go? (a) 14.4 (b) 1.44 (c) 0.0144 (d) 0.144
  17. 17.0.44 × 0.8 — where does the decimal point go? (a) 0.0352 (b) 0.352 (c) 3.52 (d) 0.00352
  18. 18.8.8 × 8 — where does the decimal point go? (a) 70.4 (b) 704 (c) 0.704 (d) 7.04
  19. 19.0.72 × 3.2 — where does the decimal point go? (a) 0.2304 (b) 23.04 (c) 0.02304 (d) 2.304
  20. 20.0.83 × 9 — where does the decimal point go? (a) 7.47 (b) 74.7 (c) 0.0747 (d) 0.747
  21. 21.0.41 × 0.4 — where does the decimal point go? (a) 0.00164 (b) 1.64 (c) 0.0164 (d) 0.164
  22. 22.8.5 × 0.7 — where does the decimal point go? (a) 0.0595 (b) 59.5 (c) 0.595 (d) 5.95
  23. 23.0.25 × 25 — where does the decimal point go? (a) 0.0625 (b) 62.5 (c) 0.625 (d) 6.25
  24. 24.2.6 × 2.9 — where does the decimal point go? (a) 75.4 (b) 0.754 (c) 0.0754 (d) 7.54
  25. 25.0.23 × 1.8 — where does the decimal point go? (a) 0.0414 (b) 0.414 (c) 0.00414 (d) 4.14
  26. 26.0.75 × 33 — where does the decimal point go? (a) 0.2475 (b) 24.75 (c) 247.5 (d) 2.475
  27. 27.0.52 × 41 — where does the decimal point go? (a) 2.132 (b) 213.2 (c) 0.2132 (d) 21.32
  28. 28.2.9 × 15 — where does the decimal point go? (a) 0.435 (b) 435 (c) 4.35 (d) 43.5
  29. 29.0.43 × 2 — where does the decimal point go? (a) 0.086 (b) 0.0086 (c) 8.6 (d) 0.86
  30. 30.5.8 × 1.8 — where does the decimal point go? (a) 1.044 (b) 0.1044 (c) 104.4 (d) 10.44
  31. 31.0.92 × 0.9 — where does the decimal point go? (a) 0.0828 (b) 8.28 (c) 0.828 (d) 0.00828
  32. 32.0.44 × 7 — where does the decimal point go? (a) 0.308 (b) 30.8 (c) 3.08 (d) 0.0308
  33. 33.2.3 × 2 — where does the decimal point go? (a) 0.46 (b) 0.046 (c) 46 (d) 4.6
  34. 34.0.88 × 2.6 — where does the decimal point go? (a) 0.2288 (b) 2.288 (c) 0.02288 (d) 22.88
  35. 35.0.33 × 3 — where does the decimal point go? (a) 9.9 (b) 0.099 (c) 0.0099 (d) 0.99
  36. 36.2.8 × 4 — where does the decimal point go? (a) 11.2 (b) 0.112 (c) 1.12 (d) 112
  37. 37.6.4 × 0.9 — where does the decimal point go? (a) 57.6 (b) 0.576 (c) 5.76 (d) 0.0576
  38. 38.0.13 × 4 — where does the decimal point go? (a) 0.0052 (b) 0.52 (c) 5.2 (d) 0.052
  39. 39.0.21 × 4 — where does the decimal point go? (a) 0.84 (b) 0.084 (c) 0.0084 (d) 8.4
  40. 40.0.95 × 43 — where does the decimal point go? (a) 0.4085 (b) 40.85 (c) 4.085 (d) 408.5

Answer key

  1. 0.258
  2. 121.8
  3. 85.8
  4. 0.28
  5. 131.6
  6. 14.28
  7. 4.95
  8. 1.18
  9. 0.336
  10. 3.42
  11. 19.38
  12. 4.116
  13. 14.82
  14. 0.392
  15. 53.3
  16. 1.44
  17. 0.352
  18. 70.4
  19. 2.304
  20. 7.47
  21. 0.164
  22. 5.95
  23. 6.25
  24. 7.54
  25. 0.414
  26. 24.75
  27. 21.32
  28. 43.5
  29. 0.86
  30. 10.44
  31. 0.828
  32. 3.08
  33. 4.6
  34. 2.288
  35. 0.99
  36. 11.2
  37. 5.76
  38. 0.52
  39. 0.84
  40. 40.85

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