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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 343 · 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. 1.0.24 × 2 — where does the decimal point go? (a) 0.048 (b) 0.0048 (c) 4.8 (d) 0.48
  2. 2.0.43 × 1.6 — where does the decimal point go? (a) 0.688 (b) 0.0688 (c) 6.88 (d) 0.00688
  3. 3.8.1 × 22 — where does the decimal point go? (a) 178.2 (b) 1.782 (c) 1782 (d) 17.82
  4. 4.0.48 × 4 — where does the decimal point go? (a) 0.192 (b) 1.92 (c) 0.0192 (d) 19.2
  5. 5.0.78 × 2 — where does the decimal point go? (a) 0.0156 (b) 1.56 (c) 15.6 (d) 0.156
  6. 6.0.86 × 4.2 — where does the decimal point go? (a) 0.03612 (b) 0.3612 (c) 3.612 (d) 36.12
  7. 7.6.8 × 0.4 — where does the decimal point go? (a) 0.0272 (b) 2.72 (c) 27.2 (d) 0.272
  8. 8.0.81 × 1.4 — where does the decimal point go? (a) 0.1134 (b) 11.34 (c) 0.01134 (d) 1.134
  9. 9.0.23 × 29 — where does the decimal point go? (a) 6.67 (b) 66.7 (c) 0.0667 (d) 0.667
  10. 10.0.61 × 8 — where does the decimal point go? (a) 0.0488 (b) 0.488 (c) 48.8 (d) 4.88
  11. 11.0.47 × 5 — where does the decimal point go? (a) 0.235 (b) 0.0235 (c) 23.5 (d) 2.35
  12. 12.1.2 × 0.7 — where does the decimal point go? (a) 8.4 (b) 0.84 (c) 0.084 (d) 0.0084
  13. 13.9.2 × 3.1 — where does the decimal point go? (a) 28.52 (b) 2.852 (c) 0.2852 (d) 285.2
  14. 14.8.7 × 13 — where does the decimal point go? (a) 113.1 (b) 11.31 (c) 1131 (d) 1.131
  15. 15.0.79 × 0.3 — where does the decimal point go? (a) 2.37 (b) 0.0237 (c) 0.237 (d) 0.00237
  16. 16.2.5 × 3 — where does the decimal point go? (a) 0.075 (b) 75 (c) 7.5 (d) 0.75
  17. 17.6.5 × 9 — where does the decimal point go? (a) 5.85 (b) 585 (c) 58.5 (d) 0.585
  18. 18.0.94 × 3 — where does the decimal point go? (a) 0.282 (b) 0.0282 (c) 2.82 (d) 28.2
  19. 19.0.29 × 8 — where does the decimal point go? (a) 0.0232 (b) 2.32 (c) 23.2 (d) 0.232
  20. 20.0.66 × 9 — where does the decimal point go? (a) 0.0594 (b) 59.4 (c) 5.94 (d) 0.594
  21. 21.7.8 × 2.1 — where does the decimal point go? (a) 163.8 (b) 16.38 (c) 0.1638 (d) 1.638
  22. 22.5.2 × 1.7 — where does the decimal point go? (a) 88.4 (b) 0.0884 (c) 0.884 (d) 8.84
  23. 23.2.3 × 0.2 — where does the decimal point go? (a) 0.046 (b) 0.0046 (c) 0.46 (d) 4.6
  24. 24.3.4 × 4 — where does the decimal point go? (a) 0.136 (b) 136 (c) 13.6 (d) 1.36
  25. 25.4.4 × 0.3 — where does the decimal point go? (a) 13.2 (b) 0.132 (c) 0.0132 (d) 1.32
  26. 26.3.9 × 12 — where does the decimal point go? (a) 468 (b) 4.68 (c) 0.468 (d) 46.8
  27. 27.0.81 × 3 — where does the decimal point go? (a) 0.243 (b) 0.0243 (c) 2.43 (d) 24.3
  28. 28.9.9 × 48 — where does the decimal point go? (a) 4.752 (b) 47.52 (c) 4752 (d) 475.2
  29. 29.0.97 × 6 — where does the decimal point go? (a) 58.2 (b) 5.82 (c) 0.582 (d) 0.0582
  30. 30.2.2 × 7 — where does the decimal point go? (a) 15.4 (b) 0.154 (c) 154 (d) 1.54
  31. 31.1.9 × 0.9 — where does the decimal point go? (a) 1.71 (b) 0.0171 (c) 0.171 (d) 17.1
  32. 32.6.3 × 1.3 — where does the decimal point go? (a) 0.0819 (b) 0.819 (c) 81.9 (d) 8.19
  33. 33.0.63 × 13 — where does the decimal point go? (a) 0.0819 (b) 0.819 (c) 81.9 (d) 8.19
  34. 34.9.8 × 17 — where does the decimal point go? (a) 166.6 (b) 1666 (c) 1.666 (d) 16.66
  35. 35.0.43 × 5 — where does the decimal point go? (a) 0.0215 (b) 21.5 (c) 0.215 (d) 2.15
  36. 36.0.37 × 6 — where does the decimal point go? (a) 2.22 (b) 0.222 (c) 0.0222 (d) 22.2
  37. 37.1.3 × 4.6 — where does the decimal point go? (a) 5.98 (b) 0.0598 (c) 0.598 (d) 59.8
  38. 38.8.8 × 3 — where does the decimal point go? (a) 2.64 (b) 26.4 (c) 264 (d) 0.264
  39. 39.3.3 × 5 — where does the decimal point go? (a) 165 (b) 1.65 (c) 16.5 (d) 0.165
  40. 40.8.9 × 39 — where does the decimal point go? (a) 3471 (b) 34.71 (c) 3.471 (d) 347.1

Answer key

  1. 0.48
  2. 0.688
  3. 178.2
  4. 1.92
  5. 1.56
  6. 3.612
  7. 2.72
  8. 1.134
  9. 6.67
  10. 4.88
  11. 2.35
  12. 0.84
  13. 28.52
  14. 113.1
  15. 0.237
  16. 7.5
  17. 58.5
  18. 2.82
  19. 2.32
  20. 5.94
  21. 16.38
  22. 8.84
  23. 0.46
  24. 13.6
  25. 1.32
  26. 46.8
  27. 2.43
  28. 475.2
  29. 5.82
  30. 15.4
  31. 1.71
  32. 8.19
  33. 8.19
  34. 166.6
  35. 2.15
  36. 2.22
  37. 5.98
  38. 26.4
  39. 16.5
  40. 347.1

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