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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 937 · 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. 1.4.9 × 32 — where does the decimal point go? (a) 15.68 (b) 1568 (c) 156.8 (d) 1.568
  2. 2.3.7 × 35 — where does the decimal point go? (a) 129.5 (b) 1.295 (c) 12.95 (d) 1295
  3. 3.1.9 × 9 — where does the decimal point go? (a) 171 (b) 17.1 (c) 1.71 (d) 0.171
  4. 4.0.22 × 48 — where does the decimal point go? (a) 105.6 (b) 0.1056 (c) 1.056 (d) 10.56
  5. 5.3.6 × 16 — where does the decimal point go? (a) 5.76 (b) 57.6 (c) 576 (d) 0.576
  6. 6.2.9 × 12 — where does the decimal point go? (a) 34.8 (b) 0.348 (c) 348 (d) 3.48
  7. 7.0.33 × 7 — where does the decimal point go? (a) 0.0231 (b) 23.1 (c) 0.231 (d) 2.31
  8. 8.0.39 × 15 — where does the decimal point go? (a) 58.5 (b) 0.585 (c) 5.85 (d) 0.0585
  9. 9.0.84 × 0.8 — where does the decimal point go? (a) 0.0672 (b) 0.00672 (c) 0.672 (d) 6.72
  10. 10.1.9 × 41 — where does the decimal point go? (a) 77.9 (b) 0.779 (c) 779 (d) 7.79
  11. 11.0.65 × 4.3 — where does the decimal point go? (a) 2.795 (b) 0.02795 (c) 0.2795 (d) 27.95
  12. 12.2.3 × 0.2 — where does the decimal point go? (a) 0.46 (b) 4.6 (c) 0.0046 (d) 0.046
  13. 13.6.7 × 0.7 — where does the decimal point go? (a) 0.0469 (b) 0.469 (c) 4.69 (d) 46.9
  14. 14.4.9 × 6 — where does the decimal point go? (a) 294 (b) 29.4 (c) 2.94 (d) 0.294
  15. 15.0.67 × 3 — where does the decimal point go? (a) 20.1 (b) 0.0201 (c) 0.201 (d) 2.01
  16. 16.1.8 × 6 — where does the decimal point go? (a) 1.08 (b) 0.108 (c) 10.8 (d) 108
  17. 17.0.86 × 47 — where does the decimal point go? (a) 40.42 (b) 4.042 (c) 404.2 (d) 0.4042
  18. 18.0.62 × 21 — where does the decimal point go? (a) 13.02 (b) 0.1302 (c) 130.2 (d) 1.302
  19. 19.0.73 × 3 — where does the decimal point go? (a) 21.9 (b) 0.219 (c) 2.19 (d) 0.0219
  20. 20.0.52 × 21 — where does the decimal point go? (a) 1.092 (b) 10.92 (c) 109.2 (d) 0.1092
  21. 21.6.9 × 4.7 — where does the decimal point go? (a) 3.243 (b) 0.3243 (c) 324.3 (d) 32.43
  22. 22.7.2 × 44 — where does the decimal point go? (a) 3168 (b) 316.8 (c) 3.168 (d) 31.68
  23. 23.6.5 × 0.9 — where does the decimal point go? (a) 0.0585 (b) 58.5 (c) 5.85 (d) 0.585
  24. 24.9.3 × 17 — where does the decimal point go? (a) 15.81 (b) 1581 (c) 1.581 (d) 158.1
  25. 25.5.3 × 3.1 — where does the decimal point go? (a) 164.3 (b) 1.643 (c) 16.43 (d) 0.1643
  26. 26.1.5 × 7 — where does the decimal point go? (a) 1.05 (b) 10.5 (c) 105 (d) 0.105
  27. 27.0.49 × 1.5 — where does the decimal point go? (a) 7.35 (b) 0.735 (c) 0.0735 (d) 0.00735
  28. 28.2.4 × 48 — where does the decimal point go? (a) 1152 (b) 1.152 (c) 115.2 (d) 11.52
  29. 29.4.2 × 42 — where does the decimal point go? (a) 1764 (b) 1.764 (c) 176.4 (d) 17.64
  30. 30.0.41 × 9 — where does the decimal point go? (a) 36.9 (b) 3.69 (c) 0.369 (d) 0.0369
  31. 31.6.6 × 12 — where does the decimal point go? (a) 79.2 (b) 7.92 (c) 792 (d) 0.792
  32. 32.0.22 × 0.3 — where does the decimal point go? (a) 0.0066 (b) 0.00066 (c) 0.066 (d) 0.66
  33. 33.0.54 × 4 — where does the decimal point go? (a) 0.0216 (b) 0.216 (c) 2.16 (d) 21.6
  34. 34.3.8 × 2 — where does the decimal point go? (a) 76 (b) 0.076 (c) 7.6 (d) 0.76
  35. 35.4.4 × 0.6 — where does the decimal point go? (a) 0.0264 (b) 0.264 (c) 26.4 (d) 2.64
  36. 36.0.15 × 0.3 — where does the decimal point go? (a) 0.045 (b) 0.00045 (c) 0.45 (d) 0.0045
  37. 37.0.87 × 0.6 — where does the decimal point go? (a) 5.22 (b) 0.0522 (c) 0.00522 (d) 0.522
  38. 38.0.32 × 1.2 — where does the decimal point go? (a) 0.384 (b) 0.0384 (c) 0.00384 (d) 3.84
  39. 39.0.87 × 2 — where does the decimal point go? (a) 1.74 (b) 0.0174 (c) 0.174 (d) 17.4
  40. 40.5.7 × 0.9 — where does the decimal point go? (a) 0.0513 (b) 0.513 (c) 5.13 (d) 51.3

Answer key

  1. 156.8
  2. 129.5
  3. 17.1
  4. 10.56
  5. 57.6
  6. 34.8
  7. 2.31
  8. 5.85
  9. 0.672
  10. 77.9
  11. 2.795
  12. 0.46
  13. 4.69
  14. 29.4
  15. 2.01
  16. 10.8
  17. 40.42
  18. 13.02
  19. 2.19
  20. 10.92
  21. 32.43
  22. 316.8
  23. 5.85
  24. 158.1
  25. 16.43
  26. 10.5
  27. 0.735
  28. 115.2
  29. 176.4
  30. 3.69
  31. 79.2
  32. 0.066
  33. 2.16
  34. 7.6
  35. 2.64
  36. 0.045
  37. 0.522
  38. 0.384
  39. 1.74
  40. 5.13

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