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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 300 · 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. 1.0.51 × 0.8 — where does the decimal point go? (a) 0.00408 (b) 4.08 (c) 0.408 (d) 0.0408
  2. 2.6.4 × 0.6 — where does the decimal point go? (a) 0.384 (b) 0.0384 (c) 3.84 (d) 38.4
  3. 3.1.4 × 3.9 — where does the decimal point go? (a) 0.546 (b) 0.0546 (c) 54.6 (d) 5.46
  4. 4.5.7 × 3.7 — where does the decimal point go? (a) 2.109 (b) 21.09 (c) 0.2109 (d) 210.9
  5. 5.1.7 × 8 — where does the decimal point go? (a) 136 (b) 0.136 (c) 13.6 (d) 1.36
  6. 6.5.7 × 7 — where does the decimal point go? (a) 0.399 (b) 39.9 (c) 3.99 (d) 399
  7. 7.1.3 × 2 — where does the decimal point go? (a) 0.026 (b) 2.6 (c) 0.26 (d) 26
  8. 8.0.46 × 47 — where does the decimal point go? (a) 0.2162 (b) 21.62 (c) 2.162 (d) 216.2
  9. 9.7.7 × 4.6 — where does the decimal point go? (a) 3.542 (b) 0.3542 (c) 35.42 (d) 354.2
  10. 10.3.4 × 2.6 — where does the decimal point go? (a) 8.84 (b) 0.0884 (c) 88.4 (d) 0.884
  11. 11.0.93 × 3 — where does the decimal point go? (a) 2.79 (b) 27.9 (c) 0.279 (d) 0.0279
  12. 12.0.62 × 7 — where does the decimal point go? (a) 0.0434 (b) 43.4 (c) 0.434 (d) 4.34
  13. 13.0.13 × 4.2 — where does the decimal point go? (a) 0.00546 (b) 0.546 (c) 0.0546 (d) 5.46
  14. 14.2.2 × 0.8 — where does the decimal point go? (a) 0.176 (b) 1.76 (c) 17.6 (d) 0.0176
  15. 15.0.42 × 18 — where does the decimal point go? (a) 75.6 (b) 7.56 (c) 0.0756 (d) 0.756
  16. 16.0.49 × 29 — where does the decimal point go? (a) 0.1421 (b) 1.421 (c) 142.1 (d) 14.21
  17. 17.0.26 × 2.8 — where does the decimal point go? (a) 0.00728 (b) 7.28 (c) 0.728 (d) 0.0728
  18. 18.1.7 × 6 — where does the decimal point go? (a) 0.102 (b) 10.2 (c) 102 (d) 1.02
  19. 19.7.8 × 4.7 — where does the decimal point go? (a) 36.66 (b) 366.6 (c) 3.666 (d) 0.3666
  20. 20.3.3 × 49 — where does the decimal point go? (a) 161.7 (b) 1.617 (c) 16.17 (d) 1617
  21. 21.9.3 × 0.7 — where does the decimal point go? (a) 65.1 (b) 0.651 (c) 6.51 (d) 0.0651
  22. 22.9.9 × 5 — where does the decimal point go? (a) 0.495 (b) 49.5 (c) 4.95 (d) 495
  23. 23.0.38 × 8 — where does the decimal point go? (a) 0.0304 (b) 3.04 (c) 30.4 (d) 0.304
  24. 24.0.39 × 8 — where does the decimal point go? (a) 3.12 (b) 0.0312 (c) 0.312 (d) 31.2
  25. 25.1.2 × 6 — where does the decimal point go? (a) 0.72 (b) 72 (c) 0.072 (d) 7.2
  26. 26.0.51 × 4 — where does the decimal point go? (a) 2.04 (b) 20.4 (c) 0.204 (d) 0.0204
  27. 27.0.17 × 38 — where does the decimal point go? (a) 6.46 (b) 0.646 (c) 64.6 (d) 0.0646
  28. 28.6.6 × 29 — where does the decimal point go? (a) 1.914 (b) 19.14 (c) 191.4 (d) 1914
  29. 29.8.3 × 9 — where does the decimal point go? (a) 747 (b) 7.47 (c) 74.7 (d) 0.747
  30. 30.7.1 × 2.1 — where does the decimal point go? (a) 14.91 (b) 0.1491 (c) 149.1 (d) 1.491
  31. 31.0.92 × 0.6 — where does the decimal point go? (a) 5.52 (b) 0.552 (c) 0.0552 (d) 0.00552
  32. 32.8.5 × 5 — where does the decimal point go? (a) 42.5 (b) 4.25 (c) 0.425 (d) 425
  33. 33.0.58 × 2 — where does the decimal point go? (a) 11.6 (b) 1.16 (c) 0.0116 (d) 0.116
  34. 34.0.92 × 2 — where does the decimal point go? (a) 0.0184 (b) 0.184 (c) 1.84 (d) 18.4
  35. 35.0.19 × 32 — where does the decimal point go? (a) 6.08 (b) 0.0608 (c) 0.608 (d) 60.8
  36. 36.0.58 × 2.1 — where does the decimal point go? (a) 0.01218 (b) 12.18 (c) 0.1218 (d) 1.218
  37. 37.0.44 × 18 — where does the decimal point go? (a) 0.0792 (b) 7.92 (c) 0.792 (d) 79.2
  38. 38.4.2 × 18 — where does the decimal point go? (a) 0.756 (b) 756 (c) 7.56 (d) 75.6
  39. 39.1.8 × 12 — where does the decimal point go? (a) 2.16 (b) 0.216 (c) 21.6 (d) 216
  40. 40.6.8 × 4 — where does the decimal point go? (a) 2.72 (b) 272 (c) 27.2 (d) 0.272

Answer key

  1. 0.408
  2. 3.84
  3. 5.46
  4. 21.09
  5. 13.6
  6. 39.9
  7. 2.6
  8. 21.62
  9. 35.42
  10. 8.84
  11. 2.79
  12. 4.34
  13. 0.546
  14. 1.76
  15. 7.56
  16. 14.21
  17. 0.728
  18. 10.2
  19. 36.66
  20. 161.7
  21. 6.51
  22. 49.5
  23. 3.04
  24. 3.12
  25. 7.2
  26. 2.04
  27. 6.46
  28. 191.4
  29. 74.7
  30. 14.91
  31. 0.552
  32. 42.5
  33. 1.16
  34. 1.84
  35. 6.08
  36. 1.218
  37. 7.92
  38. 75.6
  39. 21.6
  40. 27.2

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