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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 991 · 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 × 18 — where does the decimal point go? (a) 1.404 (b) 0.1404 (c) 14.04 (d) 140.4
  2. 2.9.9 × 25 — where does the decimal point go? (a) 247.5 (b) 2.475 (c) 24.75 (d) 2475
  3. 3.6.7 × 1.2 — where does the decimal point go? (a) 8.04 (b) 80.4 (c) 0.0804 (d) 0.804
  4. 4.0.23 × 0.7 — where does the decimal point go? (a) 0.0161 (b) 1.61 (c) 0.161 (d) 0.00161
  5. 5.0.18 × 24 — where does the decimal point go? (a) 0.0432 (b) 43.2 (c) 0.432 (d) 4.32
  6. 6.0.31 × 32 — where does the decimal point go? (a) 0.0992 (b) 99.2 (c) 9.92 (d) 0.992
  7. 7.0.18 × 0.6 — where does the decimal point go? (a) 0.0108 (b) 1.08 (c) 0.108 (d) 0.00108
  8. 8.0.49 × 0.2 — where does the decimal point go? (a) 0.098 (b) 0.98 (c) 0.00098 (d) 0.0098
  9. 9.7.3 × 9 — where does the decimal point go? (a) 65.7 (b) 657 (c) 0.657 (d) 6.57
  10. 10.9.1 × 3.8 — where does the decimal point go? (a) 34.58 (b) 345.8 (c) 0.3458 (d) 3.458
  11. 11.5.3 × 2.9 — where does the decimal point go? (a) 0.1537 (b) 153.7 (c) 15.37 (d) 1.537
  12. 12.0.83 × 0.4 — where does the decimal point go? (a) 0.332 (b) 0.0332 (c) 3.32 (d) 0.00332
  13. 13.0.66 × 4.8 — where does the decimal point go? (a) 0.3168 (b) 3.168 (c) 31.68 (d) 0.03168
  14. 14.3.9 × 6 — where does the decimal point go? (a) 234 (b) 2.34 (c) 23.4 (d) 0.234
  15. 15.0.37 × 42 — where does the decimal point go? (a) 15.54 (b) 155.4 (c) 0.1554 (d) 1.554
  16. 16.8.5 × 7 — where does the decimal point go? (a) 5.95 (b) 0.595 (c) 59.5 (d) 595
  17. 17.0.35 × 11 — where does the decimal point go? (a) 0.385 (b) 0.0385 (c) 3.85 (d) 38.5
  18. 18.3.2 × 2.6 — where does the decimal point go? (a) 0.0832 (b) 83.2 (c) 0.832 (d) 8.32
  19. 19.0.13 × 27 — where does the decimal point go? (a) 3.51 (b) 35.1 (c) 0.0351 (d) 0.351
  20. 20.5.9 × 6 — where does the decimal point go? (a) 35.4 (b) 3.54 (c) 354 (d) 0.354
  21. 21.0.22 × 3 — where does the decimal point go? (a) 0.66 (b) 6.6 (c) 0.066 (d) 0.0066
  22. 22.6.1 × 5 — where does the decimal point go? (a) 0.305 (b) 305 (c) 30.5 (d) 3.05
  23. 23.4.7 × 9 — where does the decimal point go? (a) 0.423 (b) 4.23 (c) 423 (d) 42.3
  24. 24.2.3 × 4.5 — where does the decimal point go? (a) 10.35 (b) 0.1035 (c) 103.5 (d) 1.035
  25. 25.0.41 × 27 — where does the decimal point go? (a) 0.1107 (b) 110.7 (c) 11.07 (d) 1.107
  26. 26.0.54 × 13 — where does the decimal point go? (a) 0.0702 (b) 0.702 (c) 70.2 (d) 7.02
  27. 27.2.9 × 0.5 — where does the decimal point go? (a) 14.5 (b) 1.45 (c) 0.145 (d) 0.0145
  28. 28.0.63 × 3.2 — where does the decimal point go? (a) 0.2016 (b) 0.02016 (c) 2.016 (d) 20.16
  29. 29.3.9 × 44 — where does the decimal point go? (a) 1716 (b) 1.716 (c) 171.6 (d) 17.16
  30. 30.0.29 × 7 — where does the decimal point go? (a) 0.203 (b) 20.3 (c) 2.03 (d) 0.0203
  31. 31.0.43 × 36 — where does the decimal point go? (a) 0.1548 (b) 1.548 (c) 15.48 (d) 154.8
  32. 32.3.8 × 0.3 — where does the decimal point go? (a) 0.0114 (b) 11.4 (c) 1.14 (d) 0.114
  33. 33.1.3 × 27 — where does the decimal point go? (a) 3.51 (b) 0.351 (c) 35.1 (d) 351
  34. 34.9.3 × 0.2 — where does the decimal point go? (a) 18.6 (b) 1.86 (c) 0.186 (d) 0.0186
  35. 35.6.4 × 0.4 — where does the decimal point go? (a) 0.0256 (b) 2.56 (c) 0.256 (d) 25.6
  36. 36.0.36 × 0.3 — where does the decimal point go? (a) 0.108 (b) 0.0108 (c) 0.00108 (d) 1.08
  37. 37.3.7 × 6 — where does the decimal point go? (a) 222 (b) 0.222 (c) 2.22 (d) 22.2
  38. 38.0.27 × 2 — where does the decimal point go? (a) 0.054 (b) 0.54 (c) 0.0054 (d) 5.4
  39. 39.8.7 × 0.5 — where does the decimal point go? (a) 43.5 (b) 0.435 (c) 4.35 (d) 0.0435
  40. 40.0.22 × 49 — where does the decimal point go? (a) 1.078 (b) 10.78 (c) 0.1078 (d) 107.8

Answer key

  1. 14.04
  2. 247.5
  3. 8.04
  4. 0.161
  5. 4.32
  6. 9.92
  7. 0.108
  8. 0.098
  9. 65.7
  10. 34.58
  11. 15.37
  12. 0.332
  13. 3.168
  14. 23.4
  15. 15.54
  16. 59.5
  17. 3.85
  18. 8.32
  19. 3.51
  20. 35.4
  21. 0.66
  22. 30.5
  23. 42.3
  24. 10.35
  25. 11.07
  26. 7.02
  27. 1.45
  28. 2.016
  29. 171.6
  30. 2.03
  31. 15.48
  32. 1.14
  33. 35.1
  34. 1.86
  35. 2.56
  36. 0.108
  37. 22.2
  38. 0.54
  39. 4.35
  40. 10.78

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