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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 90 · 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. 1.1.3 × 13 — where does the decimal point go? (a) 169 (b) 0.169 (c) 16.9 (d) 1.69
  2. 2.0.48 × 0.2 — where does the decimal point go? (a) 0.00096 (b) 0.096 (c) 0.96 (d) 0.0096
  3. 3.0.99 × 3 — where does the decimal point go? (a) 29.7 (b) 0.0297 (c) 2.97 (d) 0.297
  4. 4.0.59 × 13 — where does the decimal point go? (a) 76.7 (b) 7.67 (c) 0.0767 (d) 0.767
  5. 5.2.9 × 33 — where does the decimal point go? (a) 9.57 (b) 95.7 (c) 957 (d) 0.957
  6. 6.2.3 × 0.9 — where does the decimal point go? (a) 0.207 (b) 20.7 (c) 0.0207 (d) 2.07
  7. 7.0.43 × 9 — where does the decimal point go? (a) 0.0387 (b) 0.387 (c) 3.87 (d) 38.7
  8. 8.0.17 × 17 — where does the decimal point go? (a) 2.89 (b) 28.9 (c) 0.289 (d) 0.0289
  9. 9.0.26 × 0.6 — where does the decimal point go? (a) 0.156 (b) 0.0156 (c) 1.56 (d) 0.00156
  10. 10.0.52 × 1.4 — where does the decimal point go? (a) 0.00728 (b) 0.728 (c) 0.0728 (d) 7.28
  11. 11.0.83 × 3.1 — where does the decimal point go? (a) 25.73 (b) 0.02573 (c) 0.2573 (d) 2.573
  12. 12.1.5 × 27 — where does the decimal point go? (a) 405 (b) 40.5 (c) 0.405 (d) 4.05
  13. 13.0.31 × 0.3 — where does the decimal point go? (a) 0.093 (b) 0.0093 (c) 0.00093 (d) 0.93
  14. 14.0.36 × 3 — where does the decimal point go? (a) 10.8 (b) 0.108 (c) 0.0108 (d) 1.08
  15. 15.0.21 × 0.3 — where does the decimal point go? (a) 0.063 (b) 0.00063 (c) 0.63 (d) 0.0063
  16. 16.0.33 × 4 — where does the decimal point go? (a) 0.0132 (b) 13.2 (c) 0.132 (d) 1.32
  17. 17.1.8 × 41 — where does the decimal point go? (a) 738 (b) 0.738 (c) 73.8 (d) 7.38
  18. 18.0.36 × 27 — where does the decimal point go? (a) 9.72 (b) 97.2 (c) 0.972 (d) 0.0972
  19. 19.0.66 × 6 — where does the decimal point go? (a) 0.396 (b) 39.6 (c) 0.0396 (d) 3.96
  20. 20.0.38 × 36 — where does the decimal point go? (a) 1.368 (b) 13.68 (c) 136.8 (d) 0.1368
  21. 21.1.4 × 9 — where does the decimal point go? (a) 0.126 (b) 126 (c) 1.26 (d) 12.6
  22. 22.3.5 × 0.3 — where does the decimal point go? (a) 1.05 (b) 0.105 (c) 0.0105 (d) 10.5
  23. 23.9.2 × 3.4 — where does the decimal point go? (a) 0.3128 (b) 3.128 (c) 312.8 (d) 31.28
  24. 24.0.86 × 43 — where does the decimal point go? (a) 36.98 (b) 369.8 (c) 0.3698 (d) 3.698
  25. 25.0.25 × 21 — where does the decimal point go? (a) 52.5 (b) 5.25 (c) 0.525 (d) 0.0525
  26. 26.1.9 × 3 — where does the decimal point go? (a) 57 (b) 5.7 (c) 0.57 (d) 0.057
  27. 27.4.1 × 2.3 — where does the decimal point go? (a) 9.43 (b) 0.943 (c) 0.0943 (d) 94.3
  28. 28.2.1 × 0.5 — where does the decimal point go? (a) 1.05 (b) 0.105 (c) 0.0105 (d) 10.5
  29. 29.8.6 × 0.9 — where does the decimal point go? (a) 0.0774 (b) 7.74 (c) 0.774 (d) 77.4
  30. 30.1.7 × 18 — where does the decimal point go? (a) 306 (b) 3.06 (c) 30.6 (d) 0.306
  31. 31.8.9 × 0.3 — where does the decimal point go? (a) 2.67 (b) 26.7 (c) 0.0267 (d) 0.267
  32. 32.0.21 × 0.9 — where does the decimal point go? (a) 0.189 (b) 0.0189 (c) 0.00189 (d) 1.89
  33. 33.0.36 × 0.3 — where does the decimal point go? (a) 0.0108 (b) 1.08 (c) 0.00108 (d) 0.108
  34. 34.9.2 × 9 — where does the decimal point go? (a) 0.828 (b) 82.8 (c) 828 (d) 8.28
  35. 35.6.9 × 9 — where does the decimal point go? (a) 0.621 (b) 6.21 (c) 621 (d) 62.1
  36. 36.6.2 × 2 — where does the decimal point go? (a) 12.4 (b) 1.24 (c) 124 (d) 0.124
  37. 37.0.81 × 0.3 — where does the decimal point go? (a) 0.243 (b) 0.00243 (c) 0.0243 (d) 2.43
  38. 38.6.6 × 3.2 — where does the decimal point go? (a) 0.2112 (b) 21.12 (c) 211.2 (d) 2.112
  39. 39.0.36 × 11 — where does the decimal point go? (a) 39.6 (b) 3.96 (c) 0.396 (d) 0.0396
  40. 40.0.92 × 0.8 — where does the decimal point go? (a) 7.36 (b) 0.00736 (c) 0.0736 (d) 0.736

Answer key

  1. 16.9
  2. 0.096
  3. 2.97
  4. 7.67
  5. 95.7
  6. 2.07
  7. 3.87
  8. 2.89
  9. 0.156
  10. 0.728
  11. 2.573
  12. 40.5
  13. 0.093
  14. 1.08
  15. 0.063
  16. 1.32
  17. 73.8
  18. 9.72
  19. 3.96
  20. 13.68
  21. 12.6
  22. 1.05
  23. 31.28
  24. 36.98
  25. 5.25
  26. 5.7
  27. 9.43
  28. 1.05
  29. 7.74
  30. 30.6
  31. 2.67
  32. 0.189
  33. 0.108
  34. 82.8
  35. 62.1
  36. 12.4
  37. 0.243
  38. 21.12
  39. 3.96
  40. 0.736

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