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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 961 · 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. 1.0.78 × 0.3 — where does the decimal point go? (a) 0.234 (b) 0.0234 (c) 2.34 (d) 0.00234
  2. 2.1.3 × 4.9 — where does the decimal point go? (a) 63.7 (b) 0.637 (c) 6.37 (d) 0.0637
  3. 3.0.32 × 22 — where does the decimal point go? (a) 70.4 (b) 0.704 (c) 7.04 (d) 0.0704
  4. 4.0.57 × 0.4 — where does the decimal point go? (a) 0.0228 (b) 0.228 (c) 0.00228 (d) 2.28
  5. 5.0.47 × 3 — where does the decimal point go? (a) 0.141 (b) 1.41 (c) 0.0141 (d) 14.1
  6. 6.3.9 × 3 — where does the decimal point go? (a) 1.17 (b) 0.117 (c) 11.7 (d) 117
  7. 7.7.4 × 8 — where does the decimal point go? (a) 59.2 (b) 5.92 (c) 592 (d) 0.592
  8. 8.2.2 × 34 — where does the decimal point go? (a) 748 (b) 0.748 (c) 74.8 (d) 7.48
  9. 9.1.9 × 2 — where does the decimal point go? (a) 0.38 (b) 38 (c) 3.8 (d) 0.038
  10. 10.0.95 × 1.9 — where does the decimal point go? (a) 1.805 (b) 18.05 (c) 0.01805 (d) 0.1805
  11. 11.2.1 × 22 — where does the decimal point go? (a) 4.62 (b) 462 (c) 46.2 (d) 0.462
  12. 12.0.29 × 14 — where does the decimal point go? (a) 4.06 (b) 0.0406 (c) 40.6 (d) 0.406
  13. 13.0.15 × 0.3 — where does the decimal point go? (a) 0.45 (b) 0.045 (c) 0.0045 (d) 0.00045
  14. 14.0.28 × 0.2 — where does the decimal point go? (a) 0.00056 (b) 0.0056 (c) 0.56 (d) 0.056
  15. 15.5.6 × 4.6 — where does the decimal point go? (a) 257.6 (b) 0.2576 (c) 2.576 (d) 25.76
  16. 16.2.6 × 1.2 — where does the decimal point go? (a) 0.312 (b) 0.0312 (c) 3.12 (d) 31.2
  17. 17.5.7 × 9 — where does the decimal point go? (a) 51.3 (b) 5.13 (c) 0.513 (d) 513
  18. 18.0.47 × 0.2 — where does the decimal point go? (a) 0.0094 (b) 0.094 (c) 0.94 (d) 0.00094
  19. 19.4.8 × 11 — where does the decimal point go? (a) 528 (b) 0.528 (c) 5.28 (d) 52.8
  20. 20.9.9 × 18 — where does the decimal point go? (a) 1.782 (b) 178.2 (c) 17.82 (d) 1782
  21. 21.1.2 × 0.4 — where does the decimal point go? (a) 0.0048 (b) 0.048 (c) 4.8 (d) 0.48
  22. 22.0.12 × 23 — where does the decimal point go? (a) 27.6 (b) 0.0276 (c) 0.276 (d) 2.76
  23. 23.0.73 × 4 — where does the decimal point go? (a) 2.92 (b) 0.292 (c) 0.0292 (d) 29.2
  24. 24.1.8 × 3.3 — where does the decimal point go? (a) 0.594 (b) 59.4 (c) 0.0594 (d) 5.94
  25. 25.0.98 × 29 — where does the decimal point go? (a) 2.842 (b) 28.42 (c) 0.2842 (d) 284.2
  26. 26.1.3 × 6 — where does the decimal point go? (a) 7.8 (b) 0.078 (c) 0.78 (d) 78
  27. 27.6.1 × 4 — where does the decimal point go? (a) 244 (b) 24.4 (c) 0.244 (d) 2.44
  28. 28.8.6 × 2 — where does the decimal point go? (a) 1.72 (b) 0.172 (c) 17.2 (d) 172
  29. 29.0.22 × 4 — where does the decimal point go? (a) 8.8 (b) 0.88 (c) 0.088 (d) 0.0088
  30. 30.4.6 × 41 — where does the decimal point go? (a) 188.6 (b) 1886 (c) 1.886 (d) 18.86
  31. 31.3.8 × 3 — where does the decimal point go? (a) 11.4 (b) 114 (c) 1.14 (d) 0.114
  32. 32.9.3 × 6 — where does the decimal point go? (a) 5.58 (b) 0.558 (c) 55.8 (d) 558
  33. 33.0.82 × 14 — where does the decimal point go? (a) 0.1148 (b) 114.8 (c) 11.48 (d) 1.148
  34. 34.3.8 × 0.6 — where does the decimal point go? (a) 2.28 (b) 0.228 (c) 0.0228 (d) 22.8
  35. 35.0.26 × 2.1 — where does the decimal point go? (a) 0.546 (b) 0.0546 (c) 5.46 (d) 0.00546
  36. 36.6.2 × 21 — where does the decimal point go? (a) 13.02 (b) 1302 (c) 1.302 (d) 130.2
  37. 37.2.7 × 12 — where does the decimal point go? (a) 32.4 (b) 0.324 (c) 324 (d) 3.24
  38. 38.0.26 × 24 — where does the decimal point go? (a) 62.4 (b) 0.0624 (c) 6.24 (d) 0.624
  39. 39.0.21 × 1.6 — where does the decimal point go? (a) 0.00336 (b) 3.36 (c) 0.336 (d) 0.0336
  40. 40.3.6 × 6 — where does the decimal point go? (a) 21.6 (b) 216 (c) 0.216 (d) 2.16

Answer key

  1. 0.234
  2. 6.37
  3. 7.04
  4. 0.228
  5. 1.41
  6. 11.7
  7. 59.2
  8. 74.8
  9. 3.8
  10. 1.805
  11. 46.2
  12. 4.06
  13. 0.045
  14. 0.056
  15. 25.76
  16. 3.12
  17. 51.3
  18. 0.094
  19. 52.8
  20. 178.2
  21. 0.48
  22. 2.76
  23. 2.92
  24. 5.94
  25. 28.42
  26. 7.8
  27. 24.4
  28. 17.2
  29. 0.88
  30. 188.6
  31. 11.4
  32. 55.8
  33. 11.48
  34. 2.28
  35. 0.546
  36. 130.2
  37. 32.4
  38. 6.24
  39. 0.336
  40. 21.6

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