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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 316 · 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. 1.0.69 × 0.6 — where does the decimal point go? (a) 4.14 (b) 0.414 (c) 0.0414 (d) 0.00414
  2. 2.0.84 × 9 — where does the decimal point go? (a) 0.756 (b) 7.56 (c) 75.6 (d) 0.0756
  3. 3.0.35 × 27 — where does the decimal point go? (a) 0.945 (b) 0.0945 (c) 9.45 (d) 94.5
  4. 4.7.3 × 6 — where does the decimal point go? (a) 438 (b) 4.38 (c) 43.8 (d) 0.438
  5. 5.7.8 × 28 — where does the decimal point go? (a) 218.4 (b) 21.84 (c) 2.184 (d) 2184
  6. 6.0.89 × 4.5 — where does the decimal point go? (a) 4.005 (b) 0.04005 (c) 0.4005 (d) 40.05
  7. 7.0.19 × 3.9 — where does the decimal point go? (a) 0.741 (b) 0.00741 (c) 0.0741 (d) 7.41
  8. 8.8.4 × 0.2 — where does the decimal point go? (a) 1.68 (b) 16.8 (c) 0.168 (d) 0.0168
  9. 9.0.95 × 0.7 — where does the decimal point go? (a) 0.665 (b) 0.0665 (c) 0.00665 (d) 6.65
  10. 10.0.28 × 2 — where does the decimal point go? (a) 0.0056 (b) 5.6 (c) 0.56 (d) 0.056
  11. 11.6.4 × 4.9 — where does the decimal point go? (a) 3.136 (b) 313.6 (c) 31.36 (d) 0.3136
  12. 12.0.18 × 19 — where does the decimal point go? (a) 0.342 (b) 3.42 (c) 0.0342 (d) 34.2
  13. 13.0.89 × 2 — where does the decimal point go? (a) 1.78 (b) 0.178 (c) 0.0178 (d) 17.8
  14. 14.8.1 × 4 — where does the decimal point go? (a) 324 (b) 32.4 (c) 3.24 (d) 0.324
  15. 15.0.95 × 3 — where does the decimal point go? (a) 2.85 (b) 0.0285 (c) 28.5 (d) 0.285
  16. 16.0.22 × 0.6 — where does the decimal point go? (a) 0.132 (b) 0.00132 (c) 0.0132 (d) 1.32
  17. 17.8.2 × 0.8 — where does the decimal point go? (a) 65.6 (b) 6.56 (c) 0.0656 (d) 0.656
  18. 18.2.1 × 9 — where does the decimal point go? (a) 18.9 (b) 1.89 (c) 0.189 (d) 189
  19. 19.0.64 × 6 — where does the decimal point go? (a) 0.384 (b) 0.0384 (c) 38.4 (d) 3.84
  20. 20.0.51 × 7 — where does the decimal point go? (a) 3.57 (b) 0.357 (c) 0.0357 (d) 35.7
  21. 21.4.9 × 7 — where does the decimal point go? (a) 0.343 (b) 34.3 (c) 3.43 (d) 343
  22. 22.5.1 × 46 — where does the decimal point go? (a) 2.346 (b) 234.6 (c) 23.46 (d) 2346
  23. 23.2.5 × 3.5 — where does the decimal point go? (a) 8.75 (b) 0.875 (c) 87.5 (d) 0.0875
  24. 24.0.89 × 45 — where does the decimal point go? (a) 400.5 (b) 4.005 (c) 0.4005 (d) 40.05
  25. 25.0.38 × 0.9 — where does the decimal point go? (a) 0.0342 (b) 0.00342 (c) 0.342 (d) 3.42
  26. 26.0.71 × 0.3 — where does the decimal point go? (a) 0.213 (b) 0.0213 (c) 2.13 (d) 0.00213
  27. 27.8.1 × 1.9 — where does the decimal point go? (a) 0.1539 (b) 153.9 (c) 1.539 (d) 15.39
  28. 28.6.1 × 0.4 — where does the decimal point go? (a) 2.44 (b) 0.0244 (c) 24.4 (d) 0.244
  29. 29.0.72 × 3 — where does the decimal point go? (a) 0.216 (b) 21.6 (c) 0.0216 (d) 2.16
  30. 30.0.67 × 31 — where does the decimal point go? (a) 20.77 (b) 2.077 (c) 207.7 (d) 0.2077
  31. 31.0.61 × 3 — where does the decimal point go? (a) 0.0183 (b) 18.3 (c) 1.83 (d) 0.183
  32. 32.8.2 × 0.2 — where does the decimal point go? (a) 0.0164 (b) 16.4 (c) 0.164 (d) 1.64
  33. 33.9.7 × 0.5 — where does the decimal point go? (a) 0.0485 (b) 0.485 (c) 48.5 (d) 4.85
  34. 34.5.1 × 23 — where does the decimal point go? (a) 117.3 (b) 1.173 (c) 1173 (d) 11.73
  35. 35.2.4 × 38 — where does the decimal point go? (a) 91.2 (b) 0.912 (c) 912 (d) 9.12
  36. 36.0.96 × 29 — where does the decimal point go? (a) 27.84 (b) 0.2784 (c) 278.4 (d) 2.784
  37. 37.7.2 × 0.7 — where does the decimal point go? (a) 5.04 (b) 0.0504 (c) 0.504 (d) 50.4
  38. 38.0.98 × 7 — where does the decimal point go? (a) 68.6 (b) 0.0686 (c) 0.686 (d) 6.86
  39. 39.5.8 × 7 — where does the decimal point go? (a) 4.06 (b) 40.6 (c) 0.406 (d) 406
  40. 40.2.8 × 3.7 — where does the decimal point go? (a) 10.36 (b) 1.036 (c) 0.1036 (d) 103.6

Answer key

  1. 0.414
  2. 7.56
  3. 9.45
  4. 43.8
  5. 218.4
  6. 4.005
  7. 0.741
  8. 1.68
  9. 0.665
  10. 0.56
  11. 31.36
  12. 3.42
  13. 1.78
  14. 32.4
  15. 2.85
  16. 0.132
  17. 6.56
  18. 18.9
  19. 3.84
  20. 3.57
  21. 34.3
  22. 234.6
  23. 8.75
  24. 40.05
  25. 0.342
  26. 0.213
  27. 15.39
  28. 2.44
  29. 2.16
  30. 20.77
  31. 1.83
  32. 1.64
  33. 4.85
  34. 117.3
  35. 91.2
  36. 27.84
  37. 5.04
  38. 6.86
  39. 40.6
  40. 10.36

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