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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 235 · 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. 1.3.6 × 1.8 — where does the decimal point go? (a) 6.48 (b) 0.648 (c) 0.0648 (d) 64.8
  2. 2.7.1 × 4.1 — where does the decimal point go? (a) 2.911 (b) 0.2911 (c) 291.1 (d) 29.11
  3. 3.0.12 × 27 — where does the decimal point go? (a) 0.324 (b) 3.24 (c) 0.0324 (d) 32.4
  4. 4.0.32 × 0.4 — where does the decimal point go? (a) 0.0128 (b) 1.28 (c) 0.128 (d) 0.00128
  5. 5.0.63 × 3 — where does the decimal point go? (a) 18.9 (b) 0.189 (c) 1.89 (d) 0.0189
  6. 6.0.62 × 2 — where does the decimal point go? (a) 0.124 (b) 1.24 (c) 12.4 (d) 0.0124
  7. 7.0.68 × 0.3 — where does the decimal point go? (a) 2.04 (b) 0.0204 (c) 0.00204 (d) 0.204
  8. 8.0.85 × 4.9 — where does the decimal point go? (a) 4.165 (b) 0.04165 (c) 41.65 (d) 0.4165
  9. 9.7.1 × 2.1 — where does the decimal point go? (a) 14.91 (b) 0.1491 (c) 149.1 (d) 1.491
  10. 10.0.26 × 0.2 — where does the decimal point go? (a) 0.52 (b) 0.052 (c) 0.0052 (d) 0.00052
  11. 11.8.9 × 3.8 — where does the decimal point go? (a) 338.2 (b) 0.3382 (c) 3.382 (d) 33.82
  12. 12.0.45 × 0.9 — where does the decimal point go? (a) 0.405 (b) 0.00405 (c) 0.0405 (d) 4.05
  13. 13.0.91 × 4 — where does the decimal point go? (a) 0.0364 (b) 3.64 (c) 36.4 (d) 0.364
  14. 14.0.64 × 0.4 — where does the decimal point go? (a) 0.00256 (b) 0.256 (c) 0.0256 (d) 2.56
  15. 15.7.4 × 0.9 — where does the decimal point go? (a) 66.6 (b) 0.666 (c) 6.66 (d) 0.0666
  16. 16.9.5 × 41 — where does the decimal point go? (a) 3895 (b) 3.895 (c) 389.5 (d) 38.95
  17. 17.6.1 × 4.1 — where does the decimal point go? (a) 0.2501 (b) 25.01 (c) 250.1 (d) 2.501
  18. 18.0.83 × 0.9 — where does the decimal point go? (a) 0.747 (b) 7.47 (c) 0.00747 (d) 0.0747
  19. 19.3.5 × 27 — where does the decimal point go? (a) 94.5 (b) 945 (c) 9.45 (d) 0.945
  20. 20.2.7 × 2.8 — where does the decimal point go? (a) 0.756 (b) 0.0756 (c) 7.56 (d) 75.6
  21. 21.0.66 × 18 — where does the decimal point go? (a) 11.88 (b) 118.8 (c) 0.1188 (d) 1.188
  22. 22.0.64 × 9 — where does the decimal point go? (a) 0.576 (b) 5.76 (c) 57.6 (d) 0.0576
  23. 23.9.1 × 0.9 — where does the decimal point go? (a) 0.819 (b) 81.9 (c) 0.0819 (d) 8.19
  24. 24.0.66 × 7 — where does the decimal point go? (a) 0.462 (b) 0.0462 (c) 4.62 (d) 46.2
  25. 25.0.13 × 32 — where does the decimal point go? (a) 0.0416 (b) 41.6 (c) 4.16 (d) 0.416
  26. 26.0.31 × 4.2 — where does the decimal point go? (a) 13.02 (b) 0.01302 (c) 1.302 (d) 0.1302
  27. 27.7.4 × 2.6 — where does the decimal point go? (a) 192.4 (b) 1.924 (c) 0.1924 (d) 19.24
  28. 28.0.79 × 3.1 — where does the decimal point go? (a) 0.2449 (b) 24.49 (c) 2.449 (d) 0.02449
  29. 29.2.1 × 5 — where does the decimal point go? (a) 0.105 (b) 105 (c) 1.05 (d) 10.5
  30. 30.0.31 × 2.6 — where does the decimal point go? (a) 0.806 (b) 0.0806 (c) 0.00806 (d) 8.06
  31. 31.0.98 × 9 — where does the decimal point go? (a) 0.0882 (b) 8.82 (c) 0.882 (d) 88.2
  32. 32.6.4 × 11 — where does the decimal point go? (a) 7.04 (b) 704 (c) 0.704 (d) 70.4
  33. 33.0.76 × 17 — where does the decimal point go? (a) 12.92 (b) 0.1292 (c) 129.2 (d) 1.292
  34. 34.0.46 × 3.8 — where does the decimal point go? (a) 0.01748 (b) 1.748 (c) 17.48 (d) 0.1748
  35. 35.5.3 × 31 — where does the decimal point go? (a) 16.43 (b) 1.643 (c) 164.3 (d) 1643
  36. 36.9.3 × 15 — where does the decimal point go? (a) 1.395 (b) 139.5 (c) 1395 (d) 13.95
  37. 37.8.3 × 1.4 — where does the decimal point go? (a) 1.162 (b) 11.62 (c) 116.2 (d) 0.1162
  38. 38.4.9 × 3 — where does the decimal point go? (a) 147 (b) 0.147 (c) 14.7 (d) 1.47
  39. 39.9.7 × 4 — where does the decimal point go? (a) 0.388 (b) 3.88 (c) 388 (d) 38.8
  40. 40.1.6 × 2.2 — where does the decimal point go? (a) 3.52 (b) 0.352 (c) 0.0352 (d) 35.2

Answer key

  1. 6.48
  2. 29.11
  3. 3.24
  4. 0.128
  5. 1.89
  6. 1.24
  7. 0.204
  8. 4.165
  9. 14.91
  10. 0.052
  11. 33.82
  12. 0.405
  13. 3.64
  14. 0.256
  15. 6.66
  16. 389.5
  17. 25.01
  18. 0.747
  19. 94.5
  20. 7.56
  21. 11.88
  22. 5.76
  23. 8.19
  24. 4.62
  25. 4.16
  26. 1.302
  27. 19.24
  28. 2.449
  29. 10.5
  30. 0.806
  31. 8.82
  32. 70.4
  33. 12.92
  34. 1.748
  35. 164.3
  36. 139.5
  37. 11.62
  38. 14.7
  39. 38.8
  40. 3.52

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