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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 110 · 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. 1.9.9 × 0.5 — where does the decimal point go? (a) 4.95 (b) 0.0495 (c) 0.495 (d) 49.5
  2. 2.0.69 × 2.7 — where does the decimal point go? (a) 0.1863 (b) 1.863 (c) 0.01863 (d) 18.63
  3. 3.8.7 × 1.9 — where does the decimal point go? (a) 0.1653 (b) 165.3 (c) 16.53 (d) 1.653
  4. 4.0.81 × 43 — where does the decimal point go? (a) 34.83 (b) 348.3 (c) 0.3483 (d) 3.483
  5. 5.1.3 × 46 — where does the decimal point go? (a) 5.98 (b) 0.598 (c) 598 (d) 59.8
  6. 6.0.69 × 3 — where does the decimal point go? (a) 0.207 (b) 2.07 (c) 0.0207 (d) 20.7
  7. 7.0.46 × 0.8 — where does the decimal point go? (a) 3.68 (b) 0.368 (c) 0.00368 (d) 0.0368
  8. 8.7.5 × 0.3 — where does the decimal point go? (a) 0.225 (b) 22.5 (c) 0.0225 (d) 2.25
  9. 9.0.39 × 12 — where does the decimal point go? (a) 0.0468 (b) 46.8 (c) 0.468 (d) 4.68
  10. 10.8.8 × 0.3 — where does the decimal point go? (a) 2.64 (b) 26.4 (c) 0.0264 (d) 0.264
  11. 11.0.94 × 3 — where does the decimal point go? (a) 0.0282 (b) 0.282 (c) 2.82 (d) 28.2
  12. 12.0.31 × 5 — where does the decimal point go? (a) 0.0155 (b) 0.155 (c) 1.55 (d) 15.5
  13. 13.0.88 × 2.3 — where does the decimal point go? (a) 0.02024 (b) 0.2024 (c) 20.24 (d) 2.024
  14. 14.0.31 × 44 — where does the decimal point go? (a) 0.1364 (b) 1.364 (c) 136.4 (d) 13.64
  15. 15.1.9 × 3 — where does the decimal point go? (a) 57 (b) 5.7 (c) 0.57 (d) 0.057
  16. 16.6.3 × 0.3 — where does the decimal point go? (a) 18.9 (b) 0.189 (c) 1.89 (d) 0.0189
  17. 17.0.23 × 0.6 — where does the decimal point go? (a) 0.00138 (b) 0.0138 (c) 0.138 (d) 1.38
  18. 18.5.1 × 7 — where does the decimal point go? (a) 35.7 (b) 3.57 (c) 0.357 (d) 357
  19. 19.7.2 × 4 — where does the decimal point go? (a) 2.88 (b) 0.288 (c) 288 (d) 28.8
  20. 20.4.1 × 2.4 — where does the decimal point go? (a) 0.0984 (b) 9.84 (c) 98.4 (d) 0.984
  21. 21.0.48 × 2 — where does the decimal point go? (a) 0.0096 (b) 0.96 (c) 9.6 (d) 0.096
  22. 22.0.56 × 6 — where does the decimal point go? (a) 0.0336 (b) 33.6 (c) 3.36 (d) 0.336
  23. 23.1.8 × 9 — where does the decimal point go? (a) 0.162 (b) 16.2 (c) 1.62 (d) 162
  24. 24.5.6 × 3.7 — where does the decimal point go? (a) 20.72 (b) 0.2072 (c) 2.072 (d) 207.2
  25. 25.0.71 × 5 — where does the decimal point go? (a) 3.55 (b) 0.0355 (c) 0.355 (d) 35.5
  26. 26.0.16 × 0.4 — where does the decimal point go? (a) 0.00064 (b) 0.64 (c) 0.0064 (d) 0.064
  27. 27.2.8 × 21 — where does the decimal point go? (a) 5.88 (b) 58.8 (c) 0.588 (d) 588
  28. 28.0.17 × 0.7 — where does the decimal point go? (a) 0.0119 (b) 1.19 (c) 0.119 (d) 0.00119
  29. 29.7.7 × 3 — where does the decimal point go? (a) 0.231 (b) 2.31 (c) 231 (d) 23.1
  30. 30.5.7 × 3.1 — where does the decimal point go? (a) 176.7 (b) 0.1767 (c) 17.67 (d) 1.767
  31. 31.4.9 × 5 — where does the decimal point go? (a) 2.45 (b) 24.5 (c) 245 (d) 0.245
  32. 32.0.62 × 43 — where does the decimal point go? (a) 266.6 (b) 2.666 (c) 26.66 (d) 0.2666
  33. 33.0.57 × 16 — where does the decimal point go? (a) 91.2 (b) 0.912 (c) 9.12 (d) 0.0912
  34. 34.3.6 × 3.1 — where does the decimal point go? (a) 11.16 (b) 1.116 (c) 111.6 (d) 0.1116
  35. 35.0.57 × 2.1 — where does the decimal point go? (a) 0.01197 (b) 1.197 (c) 0.1197 (d) 11.97
  36. 36.3.7 × 0.8 — where does the decimal point go? (a) 2.96 (b) 0.296 (c) 29.6 (d) 0.0296
  37. 37.0.82 × 0.3 — where does the decimal point go? (a) 0.246 (b) 0.00246 (c) 2.46 (d) 0.0246
  38. 38.7.5 × 5 — where does the decimal point go? (a) 375 (b) 37.5 (c) 3.75 (d) 0.375
  39. 39.2.1 × 0.8 — where does the decimal point go? (a) 1.68 (b) 0.0168 (c) 0.168 (d) 16.8
  40. 40.8.2 × 0.9 — where does the decimal point go? (a) 0.0738 (b) 0.738 (c) 73.8 (d) 7.38

Answer key

  1. 4.95
  2. 1.863
  3. 16.53
  4. 34.83
  5. 59.8
  6. 2.07
  7. 0.368
  8. 2.25
  9. 4.68
  10. 2.64
  11. 2.82
  12. 1.55
  13. 2.024
  14. 13.64
  15. 5.7
  16. 1.89
  17. 0.138
  18. 35.7
  19. 28.8
  20. 9.84
  21. 0.96
  22. 3.36
  23. 16.2
  24. 20.72
  25. 3.55
  26. 0.064
  27. 58.8
  28. 0.119
  29. 23.1
  30. 17.67
  31. 24.5
  32. 26.66
  33. 9.12
  34. 11.16
  35. 1.197
  36. 2.96
  37. 0.246
  38. 37.5
  39. 1.68
  40. 7.38

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