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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 840 · 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. 1.3.3 × 42 — where does the decimal point go? (a) 1386 (b) 1.386 (c) 13.86 (d) 138.6
  2. 2.6.4 × 7 — where does the decimal point go? (a) 0.448 (b) 4.48 (c) 448 (d) 44.8
  3. 3.0.88 × 0.8 — where does the decimal point go? (a) 0.0704 (b) 7.04 (c) 0.00704 (d) 0.704
  4. 4.8.4 × 13 — where does the decimal point go? (a) 109.2 (b) 1092 (c) 10.92 (d) 1.092
  5. 5.1.7 × 0.2 — where does the decimal point go? (a) 3.4 (b) 0.0034 (c) 0.34 (d) 0.034
  6. 6.0.32 × 7 — where does the decimal point go? (a) 0.0224 (b) 22.4 (c) 2.24 (d) 0.224
  7. 7.0.62 × 0.2 — where does the decimal point go? (a) 0.0124 (b) 0.124 (c) 0.00124 (d) 1.24
  8. 8.6.9 × 4.8 — where does the decimal point go? (a) 33.12 (b) 0.3312 (c) 331.2 (d) 3.312
  9. 9.0.24 × 4 — where does the decimal point go? (a) 0.096 (b) 0.96 (c) 0.0096 (d) 9.6
  10. 10.2.3 × 1.7 — where does the decimal point go? (a) 3.91 (b) 0.391 (c) 39.1 (d) 0.0391
  11. 11.0.72 × 4 — where does the decimal point go? (a) 0.288 (b) 0.0288 (c) 2.88 (d) 28.8
  12. 12.7.2 × 49 — where does the decimal point go? (a) 35.28 (b) 352.8 (c) 3.528 (d) 3528
  13. 13.0.32 × 2 — where does the decimal point go? (a) 0.064 (b) 0.64 (c) 0.0064 (d) 6.4
  14. 14.0.84 × 34 — where does the decimal point go? (a) 28.56 (b) 285.6 (c) 0.2856 (d) 2.856
  15. 15.0.74 × 43 — where does the decimal point go? (a) 3.182 (b) 0.3182 (c) 318.2 (d) 31.82
  16. 16.8.1 × 3.3 — where does the decimal point go? (a) 0.2673 (b) 267.3 (c) 26.73 (d) 2.673
  17. 17.7.3 × 3.9 — where does the decimal point go? (a) 28.47 (b) 0.2847 (c) 2.847 (d) 284.7
  18. 18.0.99 × 44 — where does the decimal point go? (a) 43.56 (b) 4.356 (c) 435.6 (d) 0.4356
  19. 19.0.97 × 4 — where does the decimal point go? (a) 3.88 (b) 38.8 (c) 0.0388 (d) 0.388
  20. 20.3.4 × 6 — where does the decimal point go? (a) 0.204 (b) 20.4 (c) 2.04 (d) 204
  21. 21.0.29 × 25 — where does the decimal point go? (a) 72.5 (b) 7.25 (c) 0.725 (d) 0.0725
  22. 22.0.36 × 4 — where does the decimal point go? (a) 0.0144 (b) 1.44 (c) 14.4 (d) 0.144
  23. 23.2.5 × 1.1 — where does the decimal point go? (a) 2.75 (b) 27.5 (c) 0.275 (d) 0.0275
  24. 24.8.9 × 4 — where does the decimal point go? (a) 356 (b) 35.6 (c) 3.56 (d) 0.356
  25. 25.8.1 × 0.7 — where does the decimal point go? (a) 5.67 (b) 0.567 (c) 56.7 (d) 0.0567
  26. 26.9.2 × 0.9 — where does the decimal point go? (a) 0.828 (b) 0.0828 (c) 8.28 (d) 82.8
  27. 27.2.6 × 41 — where does the decimal point go? (a) 1.066 (b) 1066 (c) 106.6 (d) 10.66
  28. 28.0.24 × 2 — where does the decimal point go? (a) 0.048 (b) 0.0048 (c) 4.8 (d) 0.48
  29. 29.2.4 × 1.3 — where does the decimal point go? (a) 0.312 (b) 3.12 (c) 31.2 (d) 0.0312
  30. 30.1.7 × 3 — where does the decimal point go? (a) 0.51 (b) 5.1 (c) 0.051 (d) 51
  31. 31.0.98 × 7 — where does the decimal point go? (a) 6.86 (b) 0.0686 (c) 0.686 (d) 68.6
  32. 32.0.51 × 29 — where does the decimal point go? (a) 14.79 (b) 1.479 (c) 147.9 (d) 0.1479
  33. 33.9.7 × 0.8 — where does the decimal point go? (a) 0.776 (b) 77.6 (c) 0.0776 (d) 7.76
  34. 34.0.43 × 34 — where does the decimal point go? (a) 14.62 (b) 0.1462 (c) 1.462 (d) 146.2
  35. 35.0.39 × 0.3 — where does the decimal point go? (a) 0.117 (b) 0.00117 (c) 0.0117 (d) 1.17
  36. 36.7.3 × 7 — where does the decimal point go? (a) 51.1 (b) 511 (c) 5.11 (d) 0.511
  37. 37.0.79 × 2 — where does the decimal point go? (a) 15.8 (b) 0.158 (c) 0.0158 (d) 1.58
  38. 38.7.4 × 4.4 — where does the decimal point go? (a) 3.256 (b) 325.6 (c) 32.56 (d) 0.3256
  39. 39.2.9 × 33 — where does the decimal point go? (a) 9.57 (b) 0.957 (c) 95.7 (d) 957
  40. 40.4.3 × 0.9 — where does the decimal point go? (a) 0.0387 (b) 38.7 (c) 0.387 (d) 3.87

Answer key

  1. 138.6
  2. 44.8
  3. 0.704
  4. 109.2
  5. 0.34
  6. 2.24
  7. 0.124
  8. 33.12
  9. 0.96
  10. 3.91
  11. 2.88
  12. 352.8
  13. 0.64
  14. 28.56
  15. 31.82
  16. 26.73
  17. 28.47
  18. 43.56
  19. 3.88
  20. 20.4
  21. 7.25
  22. 1.44
  23. 2.75
  24. 35.6
  25. 5.67
  26. 8.28
  27. 106.6
  28. 0.48
  29. 3.12
  30. 5.1
  31. 6.86
  32. 14.79
  33. 7.76
  34. 14.62
  35. 0.117
  36. 51.1
  37. 1.58
  38. 32.56
  39. 95.7
  40. 3.87

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