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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 297 · 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. 1.0.75 × 5 — where does the decimal point go? (a) 0.375 (b) 0.0375 (c) 37.5 (d) 3.75
  2. 2.0.41 × 16 — where does the decimal point go? (a) 0.0656 (b) 6.56 (c) 65.6 (d) 0.656
  3. 3.0.89 × 0.4 — where does the decimal point go? (a) 0.356 (b) 0.0356 (c) 0.00356 (d) 3.56
  4. 4.1.2 × 7 — where does the decimal point go? (a) 0.084 (b) 8.4 (c) 0.84 (d) 84
  5. 5.0.98 × 4 — where does the decimal point go? (a) 39.2 (b) 3.92 (c) 0.0392 (d) 0.392
  6. 6.4.3 × 2 — where does the decimal point go? (a) 0.86 (b) 8.6 (c) 86 (d) 0.086
  7. 7.9.8 × 0.9 — where does the decimal point go? (a) 88.2 (b) 0.0882 (c) 0.882 (d) 8.82
  8. 8.0.21 × 3 — where does the decimal point go? (a) 0.63 (b) 0.0063 (c) 6.3 (d) 0.063
  9. 9.0.91 × 8 — where does the decimal point go? (a) 0.0728 (b) 0.728 (c) 72.8 (d) 7.28
  10. 10.5.8 × 8 — where does the decimal point go? (a) 46.4 (b) 0.464 (c) 464 (d) 4.64
  11. 11.9.3 × 1.9 — where does the decimal point go? (a) 0.1767 (b) 1.767 (c) 176.7 (d) 17.67
  12. 12.0.15 × 35 — where does the decimal point go? (a) 52.5 (b) 5.25 (c) 0.0525 (d) 0.525
  13. 13.0.91 × 13 — where does the decimal point go? (a) 1.183 (b) 118.3 (c) 0.1183 (d) 11.83
  14. 14.2.7 × 39 — where does the decimal point go? (a) 1053 (b) 10.53 (c) 1.053 (d) 105.3
  15. 15.0.37 × 0.5 — where does the decimal point go? (a) 1.85 (b) 0.0185 (c) 0.185 (d) 0.00185
  16. 16.0.61 × 13 — where does the decimal point go? (a) 0.0793 (b) 7.93 (c) 79.3 (d) 0.793
  17. 17.8.3 × 29 — where does the decimal point go? (a) 2407 (b) 240.7 (c) 2.407 (d) 24.07
  18. 18.0.78 × 2.7 — where does the decimal point go? (a) 0.2106 (b) 0.02106 (c) 2.106 (d) 21.06
  19. 19.0.43 × 23 — where does the decimal point go? (a) 98.9 (b) 0.0989 (c) 0.989 (d) 9.89
  20. 20.0.92 × 0.9 — where does the decimal point go? (a) 0.828 (b) 8.28 (c) 0.00828 (d) 0.0828
  21. 21.9.1 × 21 — where does the decimal point go? (a) 19.11 (b) 1.911 (c) 191.1 (d) 1911
  22. 22.0.16 × 0.3 — where does the decimal point go? (a) 0.48 (b) 0.048 (c) 0.00048 (d) 0.0048
  23. 23.0.38 × 29 — where does the decimal point go? (a) 1.102 (b) 110.2 (c) 0.1102 (d) 11.02
  24. 24.0.22 × 0.3 — where does the decimal point go? (a) 0.0066 (b) 0.66 (c) 0.066 (d) 0.00066
  25. 25.7.5 × 0.9 — where does the decimal point go? (a) 0.675 (b) 0.0675 (c) 67.5 (d) 6.75
  26. 26.1.9 × 2 — where does the decimal point go? (a) 0.38 (b) 38 (c) 0.038 (d) 3.8
  27. 27.6.8 × 4 — where does the decimal point go? (a) 27.2 (b) 0.272 (c) 272 (d) 2.72
  28. 28.0.13 × 3.6 — where does the decimal point go? (a) 0.00468 (b) 0.0468 (c) 0.468 (d) 4.68
  29. 29.8.6 × 42 — where does the decimal point go? (a) 361.2 (b) 36.12 (c) 3612 (d) 3.612
  30. 30.2.7 × 2 — where does the decimal point go? (a) 5.4 (b) 54 (c) 0.54 (d) 0.054
  31. 31.5.8 × 0.3 — where does the decimal point go? (a) 1.74 (b) 0.174 (c) 0.0174 (d) 17.4
  32. 32.0.14 × 28 — where does the decimal point go? (a) 0.392 (b) 39.2 (c) 3.92 (d) 0.0392
  33. 33.7.9 × 2 — where does the decimal point go? (a) 1.58 (b) 15.8 (c) 0.158 (d) 158
  34. 34.5.8 × 2.3 — where does the decimal point go? (a) 1.334 (b) 13.34 (c) 0.1334 (d) 133.4
  35. 35.5.5 × 7 — where does the decimal point go? (a) 385 (b) 0.385 (c) 38.5 (d) 3.85
  36. 36.0.69 × 3.6 — where does the decimal point go? (a) 2.484 (b) 0.02484 (c) 0.2484 (d) 24.84
  37. 37.1.5 × 5 — where does the decimal point go? (a) 0.75 (b) 75 (c) 0.075 (d) 7.5
  38. 38.0.77 × 1.1 — where does the decimal point go? (a) 8.47 (b) 0.0847 (c) 0.00847 (d) 0.847
  39. 39.0.29 × 47 — where does the decimal point go? (a) 1.363 (b) 136.3 (c) 0.1363 (d) 13.63
  40. 40.1.6 × 0.4 — where does the decimal point go? (a) 0.64 (b) 6.4 (c) 0.064 (d) 0.0064

Answer key

  1. 3.75
  2. 6.56
  3. 0.356
  4. 8.4
  5. 3.92
  6. 8.6
  7. 8.82
  8. 0.63
  9. 7.28
  10. 46.4
  11. 17.67
  12. 5.25
  13. 11.83
  14. 105.3
  15. 0.185
  16. 7.93
  17. 240.7
  18. 2.106
  19. 9.89
  20. 0.828
  21. 191.1
  22. 0.048
  23. 11.02
  24. 0.066
  25. 6.75
  26. 3.8
  27. 27.2
  28. 0.468
  29. 361.2
  30. 5.4
  31. 1.74
  32. 3.92
  33. 15.8
  34. 13.34
  35. 38.5
  36. 2.484
  37. 7.5
  38. 0.847
  39. 13.63
  40. 0.64

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