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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 672 · 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. 1.9.7 × 5 — where does the decimal point go? (a) 48.5 (b) 4.85 (c) 0.485 (d) 485
  2. 2.2.9 × 0.4 — where does the decimal point go? (a) 0.116 (b) 0.0116 (c) 1.16 (d) 11.6
  3. 3.0.15 × 2.1 — where does the decimal point go? (a) 3.15 (b) 0.00315 (c) 0.315 (d) 0.0315
  4. 4.3.3 × 39 — where does the decimal point go? (a) 12.87 (b) 128.7 (c) 1.287 (d) 1287
  5. 5.0.91 × 4 — where does the decimal point go? (a) 0.0364 (b) 3.64 (c) 36.4 (d) 0.364
  6. 6.6.2 × 4 — where does the decimal point go? (a) 2.48 (b) 248 (c) 0.248 (d) 24.8
  7. 7.0.23 × 7 — where does the decimal point go? (a) 0.161 (b) 0.0161 (c) 1.61 (d) 16.1
  8. 8.0.57 × 8 — where does the decimal point go? (a) 4.56 (b) 0.456 (c) 45.6 (d) 0.0456
  9. 9.0.99 × 3 — where does the decimal point go? (a) 0.0297 (b) 29.7 (c) 0.297 (d) 2.97
  10. 10.5.6 × 42 — where does the decimal point go? (a) 2.352 (b) 235.2 (c) 23.52 (d) 2352
  11. 11.9.7 × 0.8 — where does the decimal point go? (a) 0.0776 (b) 7.76 (c) 77.6 (d) 0.776
  12. 12.0.28 × 0.2 — where does the decimal point go? (a) 0.56 (b) 0.056 (c) 0.00056 (d) 0.0056
  13. 13.1.9 × 15 — where does the decimal point go? (a) 28.5 (b) 285 (c) 0.285 (d) 2.85
  14. 14.0.57 × 0.2 — where does the decimal point go? (a) 0.114 (b) 0.00114 (c) 0.0114 (d) 1.14
  15. 15.0.77 × 2.3 — where does the decimal point go? (a) 0.1771 (b) 0.01771 (c) 1.771 (d) 17.71
  16. 16.2.1 × 36 — where does the decimal point go? (a) 75.6 (b) 756 (c) 0.756 (d) 7.56
  17. 17.2.1 × 2 — where does the decimal point go? (a) 42 (b) 4.2 (c) 0.042 (d) 0.42
  18. 18.0.27 × 7 — where does the decimal point go? (a) 1.89 (b) 0.189 (c) 18.9 (d) 0.0189
  19. 19.4.6 × 0.2 — where does the decimal point go? (a) 0.92 (b) 9.2 (c) 0.092 (d) 0.0092
  20. 20.7.8 × 4.1 — where does the decimal point go? (a) 319.8 (b) 3.198 (c) 0.3198 (d) 31.98
  21. 21.9.6 × 3 — where does the decimal point go? (a) 2.88 (b) 0.288 (c) 28.8 (d) 288
  22. 22.5.7 × 0.7 — where does the decimal point go? (a) 0.399 (b) 39.9 (c) 3.99 (d) 0.0399
  23. 23.0.19 × 3 — where does the decimal point go? (a) 0.0057 (b) 0.57 (c) 5.7 (d) 0.057
  24. 24.6.4 × 7 — where does the decimal point go? (a) 0.448 (b) 44.8 (c) 4.48 (d) 448
  25. 25.0.43 × 39 — where does the decimal point go? (a) 16.77 (b) 0.1677 (c) 1.677 (d) 167.7
  26. 26.0.36 × 0.6 — where does the decimal point go? (a) 0.216 (b) 0.0216 (c) 0.00216 (d) 2.16
  27. 27.0.82 × 22 — where does the decimal point go? (a) 180.4 (b) 18.04 (c) 0.1804 (d) 1.804
  28. 28.3.4 × 46 — where does the decimal point go? (a) 1.564 (b) 156.4 (c) 1564 (d) 15.64
  29. 29.8.1 × 19 — where does the decimal point go? (a) 153.9 (b) 1.539 (c) 1539 (d) 15.39
  30. 30.9.3 × 7 — where does the decimal point go? (a) 6.51 (b) 0.651 (c) 651 (d) 65.1
  31. 31.1.4 × 0.3 — where does the decimal point go? (a) 4.2 (b) 0.42 (c) 0.0042 (d) 0.042
  32. 32.4.9 × 3.4 — where does the decimal point go? (a) 166.6 (b) 16.66 (c) 1.666 (d) 0.1666
  33. 33.0.39 × 4 — where does the decimal point go? (a) 0.156 (b) 1.56 (c) 0.0156 (d) 15.6
  34. 34.0.81 × 33 — where does the decimal point go? (a) 2.673 (b) 267.3 (c) 26.73 (d) 0.2673
  35. 35.6.5 × 0.3 — where does the decimal point go? (a) 1.95 (b) 0.195 (c) 0.0195 (d) 19.5
  36. 36.9.5 × 3 — where does the decimal point go? (a) 2.85 (b) 0.285 (c) 28.5 (d) 285
  37. 37.4.9 × 17 — where does the decimal point go? (a) 83.3 (b) 8.33 (c) 0.833 (d) 833
  38. 38.1.3 × 7 — where does the decimal point go? (a) 91 (b) 0.91 (c) 9.1 (d) 0.091
  39. 39.0.37 × 4.3 — where does the decimal point go? (a) 1.591 (b) 0.1591 (c) 0.01591 (d) 15.91
  40. 40.0.39 × 9 — where does the decimal point go? (a) 0.351 (b) 35.1 (c) 3.51 (d) 0.0351

Answer key

  1. 48.5
  2. 1.16
  3. 0.315
  4. 128.7
  5. 3.64
  6. 24.8
  7. 1.61
  8. 4.56
  9. 2.97
  10. 235.2
  11. 7.76
  12. 0.056
  13. 28.5
  14. 0.114
  15. 1.771
  16. 75.6
  17. 4.2
  18. 1.89
  19. 0.92
  20. 31.98
  21. 28.8
  22. 3.99
  23. 0.57
  24. 44.8
  25. 16.77
  26. 0.216
  27. 18.04
  28. 156.4
  29. 153.9
  30. 65.1
  31. 0.42
  32. 16.66
  33. 1.56
  34. 26.73
  35. 1.95
  36. 28.5
  37. 83.3
  38. 9.1
  39. 1.591
  40. 3.51

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