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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 808 · 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. 1.0.54 × 3 — where does the decimal point go? (a) 16.2 (b) 0.0162 (c) 1.62 (d) 0.162
  2. 2.0.75 × 0.3 — where does the decimal point go? (a) 0.0225 (b) 2.25 (c) 0.225 (d) 0.00225
  3. 3.1.9 × 4.6 — where does the decimal point go? (a) 0.874 (b) 8.74 (c) 87.4 (d) 0.0874
  4. 4.0.44 × 1.1 — where does the decimal point go? (a) 0.484 (b) 0.0484 (c) 0.00484 (d) 4.84
  5. 5.1.5 × 3.5 — where does the decimal point go? (a) 5.25 (b) 0.525 (c) 0.0525 (d) 52.5
  6. 6.5.8 × 0.8 — where does the decimal point go? (a) 0.464 (b) 4.64 (c) 0.0464 (d) 46.4
  7. 7.7.7 × 4.7 — where does the decimal point go? (a) 3.619 (b) 36.19 (c) 0.3619 (d) 361.9
  8. 8.8.2 × 3.6 — where does the decimal point go? (a) 295.2 (b) 0.2952 (c) 2.952 (d) 29.52
  9. 9.0.17 × 6 — where does the decimal point go? (a) 10.2 (b) 0.102 (c) 1.02 (d) 0.0102
  10. 10.7.2 × 0.3 — where does the decimal point go? (a) 0.0216 (b) 21.6 (c) 0.216 (d) 2.16
  11. 11.5.2 × 8 — where does the decimal point go? (a) 416 (b) 4.16 (c) 0.416 (d) 41.6
  12. 12.5.4 × 2.1 — where does the decimal point go? (a) 113.4 (b) 11.34 (c) 0.1134 (d) 1.134
  13. 13.0.83 × 29 — where does the decimal point go? (a) 2.407 (b) 240.7 (c) 0.2407 (d) 24.07
  14. 14.0.78 × 3 — where does the decimal point go? (a) 23.4 (b) 0.234 (c) 2.34 (d) 0.0234
  15. 15.0.41 × 0.3 — where does the decimal point go? (a) 0.123 (b) 0.0123 (c) 1.23 (d) 0.00123
  16. 16.0.46 × 38 — where does the decimal point go? (a) 174.8 (b) 17.48 (c) 0.1748 (d) 1.748
  17. 17.4.9 × 5 — where does the decimal point go? (a) 2.45 (b) 0.245 (c) 245 (d) 24.5
  18. 18.8.7 × 6 — where does the decimal point go? (a) 52.2 (b) 522 (c) 0.522 (d) 5.22
  19. 19.4.1 × 12 — where does the decimal point go? (a) 4.92 (b) 0.492 (c) 49.2 (d) 492
  20. 20.0.49 × 3.5 — where does the decimal point go? (a) 1.715 (b) 0.1715 (c) 17.15 (d) 0.01715
  21. 21.0.59 × 4 — where does the decimal point go? (a) 2.36 (b) 0.0236 (c) 0.236 (d) 23.6
  22. 22.1.3 × 0.7 — where does the decimal point go? (a) 0.91 (b) 0.0091 (c) 0.091 (d) 9.1
  23. 23.0.33 × 6 — where does the decimal point go? (a) 19.8 (b) 0.0198 (c) 0.198 (d) 1.98
  24. 24.0.17 × 0.2 — where does the decimal point go? (a) 0.034 (b) 0.34 (c) 0.0034 (d) 0.00034
  25. 25.0.32 × 0.4 — where does the decimal point go? (a) 0.0128 (b) 0.00128 (c) 0.128 (d) 1.28
  26. 26.4.3 × 0.3 — where does the decimal point go? (a) 12.9 (b) 1.29 (c) 0.0129 (d) 0.129
  27. 27.0.22 × 8 — where does the decimal point go? (a) 0.176 (b) 0.0176 (c) 17.6 (d) 1.76
  28. 28.0.28 × 3 — where does the decimal point go? (a) 0.084 (b) 0.0084 (c) 0.84 (d) 8.4
  29. 29.0.83 × 48 — where does the decimal point go? (a) 398.4 (b) 0.3984 (c) 39.84 (d) 3.984
  30. 30.9.7 × 0.3 — where does the decimal point go? (a) 0.291 (b) 2.91 (c) 29.1 (d) 0.0291
  31. 31.9.4 × 1.2 — where does the decimal point go? (a) 1.128 (b) 112.8 (c) 11.28 (d) 0.1128
  32. 32.7.7 × 1.4 — where does the decimal point go? (a) 10.78 (b) 1.078 (c) 0.1078 (d) 107.8
  33. 33.4.1 × 3 — where does the decimal point go? (a) 0.123 (b) 12.3 (c) 1.23 (d) 123
  34. 34.4.1 × 45 — where does the decimal point go? (a) 1.845 (b) 184.5 (c) 1845 (d) 18.45
  35. 35.0.69 × 44 — where does the decimal point go? (a) 3.036 (b) 30.36 (c) 0.3036 (d) 303.6
  36. 36.9.4 × 8 — where does the decimal point go? (a) 752 (b) 0.752 (c) 75.2 (d) 7.52
  37. 37.0.25 × 15 — where does the decimal point go? (a) 37.5 (b) 0.375 (c) 3.75 (d) 0.0375
  38. 38.0.94 × 3.2 — where does the decimal point go? (a) 0.3008 (b) 30.08 (c) 0.03008 (d) 3.008
  39. 39.9.1 × 4.9 — where does the decimal point go? (a) 44.59 (b) 0.4459 (c) 4.459 (d) 445.9
  40. 40.0.21 × 2.3 — where does the decimal point go? (a) 0.0483 (b) 4.83 (c) 0.00483 (d) 0.483

Answer key

  1. 1.62
  2. 0.225
  3. 8.74
  4. 0.484
  5. 5.25
  6. 4.64
  7. 36.19
  8. 29.52
  9. 1.02
  10. 2.16
  11. 41.6
  12. 11.34
  13. 24.07
  14. 2.34
  15. 0.123
  16. 17.48
  17. 24.5
  18. 52.2
  19. 49.2
  20. 1.715
  21. 2.36
  22. 0.91
  23. 1.98
  24. 0.034
  25. 0.128
  26. 1.29
  27. 1.76
  28. 0.84
  29. 39.84
  30. 2.91
  31. 11.28
  32. 10.78
  33. 12.3
  34. 184.5
  35. 30.36
  36. 75.2
  37. 3.75
  38. 3.008
  39. 44.59
  40. 0.483

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