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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 470 · 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. 1.6.4 × 31 — where does the decimal point go? (a) 19.84 (b) 1.984 (c) 1984 (d) 198.4
  2. 2.0.96 × 3.7 — where does the decimal point go? (a) 3.552 (b) 0.3552 (c) 35.52 (d) 0.03552
  3. 3.8.9 × 0.4 — where does the decimal point go? (a) 0.356 (b) 3.56 (c) 0.0356 (d) 35.6
  4. 4.1.8 × 4.9 — where does the decimal point go? (a) 8.82 (b) 0.882 (c) 0.0882 (d) 88.2
  5. 5.0.35 × 3 — where does the decimal point go? (a) 0.105 (b) 1.05 (c) 10.5 (d) 0.0105
  6. 6.9.4 × 39 — where does the decimal point go? (a) 366.6 (b) 3.666 (c) 3666 (d) 36.66
  7. 7.0.73 × 47 — where does the decimal point go? (a) 3.431 (b) 0.3431 (c) 343.1 (d) 34.31
  8. 8.5.3 × 0.2 — where does the decimal point go? (a) 1.06 (b) 0.106 (c) 10.6 (d) 0.0106
  9. 9.4.2 × 1.6 — where does the decimal point go? (a) 0.0672 (b) 6.72 (c) 0.672 (d) 67.2
  10. 10.2.2 × 3 — where does the decimal point go? (a) 6.6 (b) 0.66 (c) 0.066 (d) 66
  11. 11.0.26 × 6 — where does the decimal point go? (a) 0.0156 (b) 15.6 (c) 1.56 (d) 0.156
  12. 12.6.5 × 0.5 — where does the decimal point go? (a) 3.25 (b) 0.0325 (c) 0.325 (d) 32.5
  13. 13.0.82 × 6 — where does the decimal point go? (a) 0.492 (b) 4.92 (c) 0.0492 (d) 49.2
  14. 14.9.9 × 9 — where does the decimal point go? (a) 0.891 (b) 89.1 (c) 8.91 (d) 891
  15. 15.9.9 × 3.1 — where does the decimal point go? (a) 3.069 (b) 0.3069 (c) 30.69 (d) 306.9
  16. 16.3.5 × 3.9 — where does the decimal point go? (a) 1.365 (b) 13.65 (c) 0.1365 (d) 136.5
  17. 17.9.4 × 9 — where does the decimal point go? (a) 0.846 (b) 846 (c) 84.6 (d) 8.46
  18. 18.3.9 × 2.3 — where does the decimal point go? (a) 0.897 (b) 0.0897 (c) 8.97 (d) 89.7
  19. 19.0.45 × 0.5 — where does the decimal point go? (a) 0.0225 (b) 0.00225 (c) 0.225 (d) 2.25
  20. 20.0.14 × 2 — where does the decimal point go? (a) 0.28 (b) 0.0028 (c) 0.028 (d) 2.8
  21. 21.7.2 × 3 — where does the decimal point go? (a) 0.216 (b) 2.16 (c) 216 (d) 21.6
  22. 22.0.48 × 17 — where does the decimal point go? (a) 0.0816 (b) 81.6 (c) 0.816 (d) 8.16
  23. 23.3.9 × 17 — where does the decimal point go? (a) 6.63 (b) 0.663 (c) 66.3 (d) 663
  24. 24.0.48 × 4.6 — where does the decimal point go? (a) 0.2208 (b) 22.08 (c) 0.02208 (d) 2.208
  25. 25.8.8 × 0.2 — where does the decimal point go? (a) 0.0176 (b) 17.6 (c) 1.76 (d) 0.176
  26. 26.0.36 × 9 — where does the decimal point go? (a) 3.24 (b) 0.0324 (c) 0.324 (d) 32.4
  27. 27.0.51 × 23 — where does the decimal point go? (a) 117.3 (b) 11.73 (c) 1.173 (d) 0.1173
  28. 28.0.91 × 0.2 — where does the decimal point go? (a) 0.182 (b) 0.0182 (c) 0.00182 (d) 1.82
  29. 29.9.3 × 9 — where does the decimal point go? (a) 8.37 (b) 83.7 (c) 0.837 (d) 837
  30. 30.4.8 × 0.8 — where does the decimal point go? (a) 0.384 (b) 0.0384 (c) 3.84 (d) 38.4
  31. 31.3.4 × 26 — where does the decimal point go? (a) 8.84 (b) 884 (c) 0.884 (d) 88.4
  32. 32.0.65 × 41 — where does the decimal point go? (a) 0.2665 (b) 26.65 (c) 266.5 (d) 2.665
  33. 33.3.7 × 13 — where does the decimal point go? (a) 48.1 (b) 0.481 (c) 4.81 (d) 481
  34. 34.0.69 × 45 — where does the decimal point go? (a) 31.05 (b) 3.105 (c) 310.5 (d) 0.3105
  35. 35.9.4 × 7 — where does the decimal point go? (a) 0.658 (b) 6.58 (c) 658 (d) 65.8
  36. 36.6.4 × 0.8 — where does the decimal point go? (a) 0.512 (b) 51.2 (c) 5.12 (d) 0.0512
  37. 37.5.2 × 3.6 — where does the decimal point go? (a) 0.1872 (b) 1.872 (c) 187.2 (d) 18.72
  38. 38.6.3 × 0.6 — where does the decimal point go? (a) 0.0378 (b) 37.8 (c) 3.78 (d) 0.378
  39. 39.0.98 × 2 — where does the decimal point go? (a) 1.96 (b) 0.196 (c) 0.0196 (d) 19.6
  40. 40.0.49 × 8 — where does the decimal point go? (a) 3.92 (b) 0.392 (c) 0.0392 (d) 39.2

Answer key

  1. 198.4
  2. 3.552
  3. 3.56
  4. 8.82
  5. 1.05
  6. 366.6
  7. 34.31
  8. 1.06
  9. 6.72
  10. 6.6
  11. 1.56
  12. 3.25
  13. 4.92
  14. 89.1
  15. 30.69
  16. 13.65
  17. 84.6
  18. 8.97
  19. 0.225
  20. 0.28
  21. 21.6
  22. 8.16
  23. 66.3
  24. 2.208
  25. 1.76
  26. 3.24
  27. 11.73
  28. 0.182
  29. 83.7
  30. 3.84
  31. 88.4
  32. 26.65
  33. 48.1
  34. 31.05
  35. 65.8
  36. 5.12
  37. 18.72
  38. 3.78
  39. 1.96
  40. 3.92

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