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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 870 · 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. 1.9.5 × 7 — where does the decimal point go? (a) 66.5 (b) 0.665 (c) 6.65 (d) 665
  2. 2.0.79 × 25 — where does the decimal point go? (a) 19.75 (b) 197.5 (c) 0.1975 (d) 1.975
  3. 3.0.84 × 0.2 — where does the decimal point go? (a) 0.00168 (b) 0.0168 (c) 1.68 (d) 0.168
  4. 4.7.6 × 3 — where does the decimal point go? (a) 228 (b) 22.8 (c) 2.28 (d) 0.228
  5. 5.0.99 × 38 — where does the decimal point go? (a) 376.2 (b) 37.62 (c) 0.3762 (d) 3.762
  6. 6.8.7 × 21 — where does the decimal point go? (a) 18.27 (b) 182.7 (c) 1.827 (d) 1827
  7. 7.4.5 × 21 — where does the decimal point go? (a) 0.945 (b) 9.45 (c) 945 (d) 94.5
  8. 8.9.4 × 9 — where does the decimal point go? (a) 84.6 (b) 8.46 (c) 0.846 (d) 846
  9. 9.7.9 × 3 — where does the decimal point go? (a) 23.7 (b) 237 (c) 2.37 (d) 0.237
  10. 10.3.2 × 14 — where does the decimal point go? (a) 4.48 (b) 44.8 (c) 0.448 (d) 448
  11. 11.0.41 × 0.6 — where does the decimal point go? (a) 0.246 (b) 0.0246 (c) 2.46 (d) 0.00246
  12. 12.2.1 × 36 — where does the decimal point go? (a) 75.6 (b) 7.56 (c) 0.756 (d) 756
  13. 13.3.9 × 37 — where does the decimal point go? (a) 14.43 (b) 144.3 (c) 1.443 (d) 1443
  14. 14.0.58 × 4 — where does the decimal point go? (a) 0.0232 (b) 23.2 (c) 2.32 (d) 0.232
  15. 15.0.34 × 34 — where does the decimal point go? (a) 11.56 (b) 115.6 (c) 0.1156 (d) 1.156
  16. 16.0.22 × 22 — where does the decimal point go? (a) 48.4 (b) 4.84 (c) 0.484 (d) 0.0484
  17. 17.2.6 × 0.6 — where does the decimal point go? (a) 0.156 (b) 1.56 (c) 15.6 (d) 0.0156
  18. 18.6.1 × 5 — where does the decimal point go? (a) 0.305 (b) 30.5 (c) 3.05 (d) 305
  19. 19.0.67 × 7 — where does the decimal point go? (a) 4.69 (b) 0.469 (c) 0.0469 (d) 46.9
  20. 20.0.46 × 4 — where does the decimal point go? (a) 1.84 (b) 0.184 (c) 18.4 (d) 0.0184
  21. 21.0.73 × 46 — where does the decimal point go? (a) 3.358 (b) 0.3358 (c) 33.58 (d) 335.8
  22. 22.3.3 × 0.6 — where does the decimal point go? (a) 0.198 (b) 19.8 (c) 1.98 (d) 0.0198
  23. 23.0.58 × 2.9 — where does the decimal point go? (a) 16.82 (b) 0.01682 (c) 1.682 (d) 0.1682
  24. 24.0.15 × 9 — where does the decimal point go? (a) 1.35 (b) 0.0135 (c) 13.5 (d) 0.135
  25. 25.1.7 × 8 — where does the decimal point go? (a) 1.36 (b) 13.6 (c) 136 (d) 0.136
  26. 26.0.83 × 2.3 — where does the decimal point go? (a) 19.09 (b) 1.909 (c) 0.01909 (d) 0.1909
  27. 27.0.57 × 3 — where does the decimal point go? (a) 17.1 (b) 0.171 (c) 1.71 (d) 0.0171
  28. 28.1.6 × 7 — where does the decimal point go? (a) 112 (b) 11.2 (c) 1.12 (d) 0.112
  29. 29.5.6 × 2 — where does the decimal point go? (a) 11.2 (b) 0.112 (c) 112 (d) 1.12
  30. 30.0.82 × 0.9 — where does the decimal point go? (a) 7.38 (b) 0.0738 (c) 0.00738 (d) 0.738
  31. 31.0.97 × 8 — where does the decimal point go? (a) 0.0776 (b) 0.776 (c) 7.76 (d) 77.6
  32. 32.8.6 × 7 — where does the decimal point go? (a) 602 (b) 0.602 (c) 6.02 (d) 60.2
  33. 33.7.3 × 2.9 — where does the decimal point go? (a) 21.17 (b) 211.7 (c) 2.117 (d) 0.2117
  34. 34.0.94 × 2.1 — where does the decimal point go? (a) 19.74 (b) 0.01974 (c) 0.1974 (d) 1.974
  35. 35.4.9 × 2.7 — where does the decimal point go? (a) 0.1323 (b) 1.323 (c) 13.23 (d) 132.3
  36. 36.9.2 × 0.7 — where does the decimal point go? (a) 0.0644 (b) 64.4 (c) 0.644 (d) 6.44
  37. 37.6.6 × 9 — where does the decimal point go? (a) 5.94 (b) 594 (c) 0.594 (d) 59.4
  38. 38.8.7 × 0.5 — where does the decimal point go? (a) 0.435 (b) 43.5 (c) 4.35 (d) 0.0435
  39. 39.0.59 × 3.2 — where does the decimal point go? (a) 0.1888 (b) 1.888 (c) 0.01888 (d) 18.88
  40. 40.5.1 × 14 — where does the decimal point go? (a) 714 (b) 7.14 (c) 71.4 (d) 0.714

Answer key

  1. 66.5
  2. 19.75
  3. 0.168
  4. 22.8
  5. 37.62
  6. 182.7
  7. 94.5
  8. 84.6
  9. 23.7
  10. 44.8
  11. 0.246
  12. 75.6
  13. 144.3
  14. 2.32
  15. 11.56
  16. 4.84
  17. 1.56
  18. 30.5
  19. 4.69
  20. 1.84
  21. 33.58
  22. 1.98
  23. 1.682
  24. 1.35
  25. 13.6
  26. 1.909
  27. 1.71
  28. 11.2
  29. 11.2
  30. 0.738
  31. 7.76
  32. 60.2
  33. 21.17
  34. 1.974
  35. 13.23
  36. 6.44
  37. 59.4
  38. 4.35
  39. 1.888
  40. 71.4

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