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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 43 · 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. 1.0.18 × 18 — where does the decimal point go? (a) 3.24 (b) 0.324 (c) 0.0324 (d) 32.4
  2. 2.6.9 × 0.6 — where does the decimal point go? (a) 0.0414 (b) 41.4 (c) 0.414 (d) 4.14
  3. 3.1.7 × 9 — where does the decimal point go? (a) 153 (b) 15.3 (c) 0.153 (d) 1.53
  4. 4.0.13 × 38 — where does the decimal point go? (a) 49.4 (b) 0.494 (c) 0.0494 (d) 4.94
  5. 5.0.19 × 13 — where does the decimal point go? (a) 24.7 (b) 2.47 (c) 0.0247 (d) 0.247
  6. 6.1.6 × 8 — where does the decimal point go? (a) 12.8 (b) 0.128 (c) 1.28 (d) 128
  7. 7.5.6 × 9 — where does the decimal point go? (a) 5.04 (b) 504 (c) 0.504 (d) 50.4
  8. 8.9.3 × 19 — where does the decimal point go? (a) 17.67 (b) 1.767 (c) 176.7 (d) 1767
  9. 9.0.12 × 0.3 — where does the decimal point go? (a) 0.036 (b) 0.0036 (c) 0.00036 (d) 0.36
  10. 10.0.87 × 4.2 — where does the decimal point go? (a) 0.3654 (b) 3.654 (c) 0.03654 (d) 36.54
  11. 11.0.21 × 17 — where does the decimal point go? (a) 0.0357 (b) 3.57 (c) 0.357 (d) 35.7
  12. 12.0.35 × 19 — where does the decimal point go? (a) 0.665 (b) 6.65 (c) 66.5 (d) 0.0665
  13. 13.1.8 × 3.6 — where does the decimal point go? (a) 0.0648 (b) 64.8 (c) 0.648 (d) 6.48
  14. 14.8.1 × 49 — where does the decimal point go? (a) 39.69 (b) 3.969 (c) 3969 (d) 396.9
  15. 15.0.53 × 6 — where does the decimal point go? (a) 31.8 (b) 0.0318 (c) 0.318 (d) 3.18
  16. 16.4.2 × 0.6 — where does the decimal point go? (a) 2.52 (b) 0.252 (c) 0.0252 (d) 25.2
  17. 17.7.9 × 4.2 — where does the decimal point go? (a) 33.18 (b) 331.8 (c) 3.318 (d) 0.3318
  18. 18.8.1 × 0.2 — where does the decimal point go? (a) 16.2 (b) 0.0162 (c) 0.162 (d) 1.62
  19. 19.0.89 × 0.3 — where does the decimal point go? (a) 0.267 (b) 0.0267 (c) 0.00267 (d) 2.67
  20. 20.6.5 × 35 — where does the decimal point go? (a) 2.275 (b) 2275 (c) 227.5 (d) 22.75
  21. 21.0.53 × 27 — where does the decimal point go? (a) 0.1431 (b) 1.431 (c) 143.1 (d) 14.31
  22. 22.7.7 × 0.5 — where does the decimal point go? (a) 0.385 (b) 38.5 (c) 3.85 (d) 0.0385
  23. 23.0.47 × 1.1 — where does the decimal point go? (a) 5.17 (b) 0.517 (c) 0.00517 (d) 0.0517
  24. 24.0.36 × 7 — where does the decimal point go? (a) 0.252 (b) 2.52 (c) 0.0252 (d) 25.2
  25. 25.6.9 × 0.5 — where does the decimal point go? (a) 0.345 (b) 0.0345 (c) 3.45 (d) 34.5
  26. 26.9.3 × 1.5 — where does the decimal point go? (a) 13.95 (b) 139.5 (c) 0.1395 (d) 1.395
  27. 27.0.33 × 4.1 — where does the decimal point go? (a) 1.353 (b) 13.53 (c) 0.01353 (d) 0.1353
  28. 28.0.53 × 45 — where does the decimal point go? (a) 23.85 (b) 0.2385 (c) 2.385 (d) 238.5
  29. 29.0.64 × 3.9 — where does the decimal point go? (a) 2.496 (b) 0.2496 (c) 0.02496 (d) 24.96
  30. 30.0.53 × 11 — where does the decimal point go? (a) 58.3 (b) 5.83 (c) 0.583 (d) 0.0583
  31. 31.0.68 × 4 — where does the decimal point go? (a) 2.72 (b) 27.2 (c) 0.0272 (d) 0.272
  32. 32.9.5 × 3 — where does the decimal point go? (a) 2.85 (b) 28.5 (c) 285 (d) 0.285
  33. 33.6.5 × 0.3 — where does the decimal point go? (a) 0.195 (b) 19.5 (c) 0.0195 (d) 1.95
  34. 34.5.6 × 1.8 — where does the decimal point go? (a) 0.1008 (b) 100.8 (c) 1.008 (d) 10.08
  35. 35.0.12 × 2.1 — where does the decimal point go? (a) 0.00252 (b) 0.252 (c) 0.0252 (d) 2.52
  36. 36.0.69 × 2.5 — where does the decimal point go? (a) 17.25 (b) 0.1725 (c) 0.01725 (d) 1.725
  37. 37.0.98 × 18 — where does the decimal point go? (a) 176.4 (b) 0.1764 (c) 1.764 (d) 17.64
  38. 38.0.78 × 0.9 — where does the decimal point go? (a) 0.0702 (b) 0.702 (c) 7.02 (d) 0.00702
  39. 39.4.2 × 29 — where does the decimal point go? (a) 1218 (b) 121.8 (c) 12.18 (d) 1.218
  40. 40.0.86 × 1.8 — where does the decimal point go? (a) 0.01548 (b) 1.548 (c) 15.48 (d) 0.1548

Answer key

  1. 3.24
  2. 4.14
  3. 15.3
  4. 4.94
  5. 2.47
  6. 12.8
  7. 50.4
  8. 176.7
  9. 0.036
  10. 3.654
  11. 3.57
  12. 6.65
  13. 6.48
  14. 396.9
  15. 3.18
  16. 2.52
  17. 33.18
  18. 1.62
  19. 0.267
  20. 227.5
  21. 14.31
  22. 3.85
  23. 0.517
  24. 2.52
  25. 3.45
  26. 13.95
  27. 1.353
  28. 23.85
  29. 2.496
  30. 5.83
  31. 2.72
  32. 28.5
  33. 1.95
  34. 10.08
  35. 0.252
  36. 1.725
  37. 17.64
  38. 0.702
  39. 121.8
  40. 1.548

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