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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 750 · 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. 1.7.7 × 46 — where does the decimal point go? (a) 35.42 (b) 3.542 (c) 3542 (d) 354.2
  2. 2.9.7 × 0.5 — where does the decimal point go? (a) 0.0485 (b) 0.485 (c) 4.85 (d) 48.5
  3. 3.3.4 × 21 — where does the decimal point go? (a) 71.4 (b) 7.14 (c) 0.714 (d) 714
  4. 4.0.21 × 0.2 — where does the decimal point go? (a) 0.042 (b) 0.42 (c) 0.0042 (d) 0.00042
  5. 5.3.3 × 0.2 — where does the decimal point go? (a) 0.0066 (b) 0.066 (c) 6.6 (d) 0.66
  6. 6.0.53 × 7 — where does the decimal point go? (a) 0.0371 (b) 3.71 (c) 0.371 (d) 37.1
  7. 7.2.7 × 21 — where does the decimal point go? (a) 56.7 (b) 567 (c) 0.567 (d) 5.67
  8. 8.0.91 × 0.2 — where does the decimal point go? (a) 0.182 (b) 0.0182 (c) 1.82 (d) 0.00182
  9. 9.1.8 × 3 — where does the decimal point go? (a) 54 (b) 0.54 (c) 0.054 (d) 5.4
  10. 10.9.4 × 8 — where does the decimal point go? (a) 752 (b) 75.2 (c) 0.752 (d) 7.52
  11. 11.0.99 × 23 — where does the decimal point go? (a) 0.2277 (b) 227.7 (c) 22.77 (d) 2.277
  12. 12.0.58 × 7 — where does the decimal point go? (a) 40.6 (b) 0.0406 (c) 4.06 (d) 0.406
  13. 13.0.92 × 46 — where does the decimal point go? (a) 0.4232 (b) 423.2 (c) 4.232 (d) 42.32
  14. 14.4.2 × 21 — where does the decimal point go? (a) 88.2 (b) 882 (c) 0.882 (d) 8.82
  15. 15.0.31 × 8 — where does the decimal point go? (a) 0.0248 (b) 2.48 (c) 0.248 (d) 24.8
  16. 16.8.1 × 0.9 — where does the decimal point go? (a) 72.9 (b) 7.29 (c) 0.729 (d) 0.0729
  17. 17.0.14 × 0.3 — where does the decimal point go? (a) 0.042 (b) 0.42 (c) 0.00042 (d) 0.0042
  18. 18.9.2 × 6 — where does the decimal point go? (a) 5.52 (b) 55.2 (c) 0.552 (d) 552
  19. 19.0.99 × 0.2 — where does the decimal point go? (a) 0.0198 (b) 0.00198 (c) 0.198 (d) 1.98
  20. 20.4.4 × 41 — where does the decimal point go? (a) 1804 (b) 18.04 (c) 1.804 (d) 180.4
  21. 21.0.85 × 7 — where does the decimal point go? (a) 0.0595 (b) 5.95 (c) 59.5 (d) 0.595
  22. 22.0.43 × 4.3 — where does the decimal point go? (a) 0.1849 (b) 18.49 (c) 1.849 (d) 0.01849
  23. 23.0.21 × 6 — where does the decimal point go? (a) 1.26 (b) 0.126 (c) 0.0126 (d) 12.6
  24. 24.2.8 × 0.6 — where does the decimal point go? (a) 0.0168 (b) 0.168 (c) 1.68 (d) 16.8
  25. 25.0.57 × 34 — where does the decimal point go? (a) 19.38 (b) 193.8 (c) 1.938 (d) 0.1938
  26. 26.0.54 × 0.8 — where does the decimal point go? (a) 4.32 (b) 0.00432 (c) 0.432 (d) 0.0432
  27. 27.3.5 × 5 — where does the decimal point go? (a) 0.175 (b) 1.75 (c) 175 (d) 17.5
  28. 28.0.92 × 11 — where does the decimal point go? (a) 1.012 (b) 0.1012 (c) 10.12 (d) 101.2
  29. 29.0.79 × 17 — where does the decimal point go? (a) 13.43 (b) 134.3 (c) 1.343 (d) 0.1343
  30. 30.5.3 × 0.2 — where does the decimal point go? (a) 0.0106 (b) 1.06 (c) 10.6 (d) 0.106
  31. 31.0.21 × 0.3 — where does the decimal point go? (a) 0.0063 (b) 0.63 (c) 0.00063 (d) 0.063
  32. 32.1.2 × 2 — where does the decimal point go? (a) 0.24 (b) 0.024 (c) 2.4 (d) 24
  33. 33.0.57 × 8 — where does the decimal point go? (a) 45.6 (b) 0.456 (c) 0.0456 (d) 4.56
  34. 34.2.2 × 1.3 — where does the decimal point go? (a) 0.286 (b) 0.0286 (c) 2.86 (d) 28.6
  35. 35.4.2 × 13 — where does the decimal point go? (a) 546 (b) 5.46 (c) 0.546 (d) 54.6
  36. 36.0.82 × 0.4 — where does the decimal point go? (a) 0.00328 (b) 3.28 (c) 0.328 (d) 0.0328
  37. 37.0.67 × 49 — where does the decimal point go? (a) 3.283 (b) 328.3 (c) 0.3283 (d) 32.83
  38. 38.1.3 × 3.5 — where does the decimal point go? (a) 0.0455 (b) 4.55 (c) 45.5 (d) 0.455
  39. 39.0.67 × 7 — where does the decimal point go? (a) 0.0469 (b) 46.9 (c) 0.469 (d) 4.69
  40. 40.0.59 × 3.3 — where does the decimal point go? (a) 19.47 (b) 1.947 (c) 0.01947 (d) 0.1947

Answer key

  1. 354.2
  2. 4.85
  3. 71.4
  4. 0.042
  5. 0.66
  6. 3.71
  7. 56.7
  8. 0.182
  9. 5.4
  10. 75.2
  11. 22.77
  12. 4.06
  13. 42.32
  14. 88.2
  15. 2.48
  16. 7.29
  17. 0.042
  18. 55.2
  19. 0.198
  20. 180.4
  21. 5.95
  22. 1.849
  23. 1.26
  24. 1.68
  25. 19.38
  26. 0.432
  27. 17.5
  28. 10.12
  29. 13.43
  30. 1.06
  31. 0.063
  32. 2.4
  33. 4.56
  34. 2.86
  35. 54.6
  36. 0.328
  37. 32.83
  38. 4.55
  39. 4.69
  40. 1.947

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