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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 549 · 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. 1.3.9 × 1.8 — where does the decimal point go? (a) 7.02 (b) 0.0702 (c) 70.2 (d) 0.702
  2. 2.5.2 × 3 — where does the decimal point go? (a) 1.56 (b) 0.156 (c) 156 (d) 15.6
  3. 3.5.1 × 3.5 — where does the decimal point go? (a) 17.85 (b) 0.1785 (c) 178.5 (d) 1.785
  4. 4.8.5 × 2.3 — where does the decimal point go? (a) 0.1955 (b) 1.955 (c) 195.5 (d) 19.55
  5. 5.0.53 × 0.6 — where does the decimal point go? (a) 0.00318 (b) 3.18 (c) 0.0318 (d) 0.318
  6. 6.0.45 × 1.5 — where does the decimal point go? (a) 0.0675 (b) 0.675 (c) 6.75 (d) 0.00675
  7. 7.9.5 × 0.3 — where does the decimal point go? (a) 0.285 (b) 2.85 (c) 28.5 (d) 0.0285
  8. 8.1.3 × 29 — where does the decimal point go? (a) 377 (b) 0.377 (c) 37.7 (d) 3.77
  9. 9.0.83 × 23 — where does the decimal point go? (a) 1.909 (b) 19.09 (c) 190.9 (d) 0.1909
  10. 10.2.5 × 0.9 — where does the decimal point go? (a) 0.225 (b) 22.5 (c) 2.25 (d) 0.0225
  11. 11.0.17 × 1.6 — where does the decimal point go? (a) 0.0272 (b) 0.00272 (c) 0.272 (d) 2.72
  12. 12.3.9 × 0.2 — where does the decimal point go? (a) 7.8 (b) 0.78 (c) 0.078 (d) 0.0078
  13. 13.0.37 × 14 — where does the decimal point go? (a) 0.518 (b) 5.18 (c) 0.0518 (d) 51.8
  14. 14.0.44 × 9 — where does the decimal point go? (a) 0.396 (b) 0.0396 (c) 3.96 (d) 39.6
  15. 15.0.48 × 8 — where does the decimal point go? (a) 0.0384 (b) 0.384 (c) 38.4 (d) 3.84
  16. 16.5.3 × 4 — where does the decimal point go? (a) 2.12 (b) 212 (c) 21.2 (d) 0.212
  17. 17.8.6 × 8 — where does the decimal point go? (a) 0.688 (b) 688 (c) 6.88 (d) 68.8
  18. 18.0.68 × 4.8 — where does the decimal point go? (a) 3.264 (b) 0.03264 (c) 32.64 (d) 0.3264
  19. 19.3.8 × 11 — where does the decimal point go? (a) 4.18 (b) 0.418 (c) 418 (d) 41.8
  20. 20.0.51 × 0.2 — where does the decimal point go? (a) 1.02 (b) 0.00102 (c) 0.102 (d) 0.0102
  21. 21.4.3 × 1.6 — where does the decimal point go? (a) 0.688 (b) 68.8 (c) 6.88 (d) 0.0688
  22. 22.0.15 × 0.3 — where does the decimal point go? (a) 0.00045 (b) 0.0045 (c) 0.45 (d) 0.045
  23. 23.2.2 × 2 — where does the decimal point go? (a) 0.044 (b) 0.44 (c) 44 (d) 4.4
  24. 24.0.23 × 0.6 — where does the decimal point go? (a) 0.00138 (b) 0.138 (c) 1.38 (d) 0.0138
  25. 25.2.9 × 0.7 — where does the decimal point go? (a) 2.03 (b) 0.203 (c) 20.3 (d) 0.0203
  26. 26.8.7 × 8 — where does the decimal point go? (a) 69.6 (b) 6.96 (c) 0.696 (d) 696
  27. 27.2.1 × 0.8 — where does the decimal point go? (a) 0.0168 (b) 16.8 (c) 1.68 (d) 0.168
  28. 28.0.28 × 43 — where does the decimal point go? (a) 12.04 (b) 1.204 (c) 0.1204 (d) 120.4
  29. 29.0.63 × 26 — where does the decimal point go? (a) 1.638 (b) 163.8 (c) 0.1638 (d) 16.38
  30. 30.0.77 × 0.6 — where does the decimal point go? (a) 4.62 (b) 0.0462 (c) 0.462 (d) 0.00462
  31. 31.3.7 × 4.3 — where does the decimal point go? (a) 159.1 (b) 0.1591 (c) 1.591 (d) 15.91
  32. 32.4.8 × 38 — where does the decimal point go? (a) 1.824 (b) 1824 (c) 18.24 (d) 182.4
  33. 33.3.9 × 23 — where does the decimal point go? (a) 0.897 (b) 8.97 (c) 89.7 (d) 897
  34. 34.0.43 × 13 — where does the decimal point go? (a) 5.59 (b) 0.559 (c) 0.0559 (d) 55.9
  35. 35.7.4 × 23 — where does the decimal point go? (a) 1.702 (b) 17.02 (c) 1702 (d) 170.2
  36. 36.2.3 × 5 — where does the decimal point go? (a) 115 (b) 1.15 (c) 0.115 (d) 11.5
  37. 37.8.2 × 49 — where does the decimal point go? (a) 4.018 (b) 4018 (c) 40.18 (d) 401.8
  38. 38.5.7 × 43 — where does the decimal point go? (a) 2451 (b) 2.451 (c) 245.1 (d) 24.51
  39. 39.2.6 × 4 — where does the decimal point go? (a) 0.104 (b) 10.4 (c) 104 (d) 1.04
  40. 40.5.2 × 23 — where does the decimal point go? (a) 119.6 (b) 1.196 (c) 1196 (d) 11.96

Answer key

  1. 7.02
  2. 15.6
  3. 17.85
  4. 19.55
  5. 0.318
  6. 0.675
  7. 2.85
  8. 37.7
  9. 19.09
  10. 2.25
  11. 0.272
  12. 0.78
  13. 5.18
  14. 3.96
  15. 3.84
  16. 21.2
  17. 68.8
  18. 3.264
  19. 41.8
  20. 0.102
  21. 6.88
  22. 0.045
  23. 4.4
  24. 0.138
  25. 2.03
  26. 69.6
  27. 1.68
  28. 12.04
  29. 16.38
  30. 0.462
  31. 15.91
  32. 182.4
  33. 89.7
  34. 5.59
  35. 170.2
  36. 11.5
  37. 401.8
  38. 245.1
  39. 10.4
  40. 119.6

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