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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 191 · 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. 1.0.86 × 37 — where does the decimal point go? (a) 3.182 (b) 318.2 (c) 31.82 (d) 0.3182
  2. 2.0.61 × 3 — where does the decimal point go? (a) 1.83 (b) 0.0183 (c) 0.183 (d) 18.3
  3. 3.0.86 × 39 — where does the decimal point go? (a) 33.54 (b) 3.354 (c) 0.3354 (d) 335.4
  4. 4.8.7 × 0.3 — where does the decimal point go? (a) 2.61 (b) 26.1 (c) 0.0261 (d) 0.261
  5. 5.2.2 × 0.8 — where does the decimal point go? (a) 0.0176 (b) 0.176 (c) 17.6 (d) 1.76
  6. 6.3.6 × 3 — where does the decimal point go? (a) 108 (b) 1.08 (c) 10.8 (d) 0.108
  7. 7.0.57 × 0.5 — where does the decimal point go? (a) 0.0285 (b) 0.285 (c) 0.00285 (d) 2.85
  8. 8.0.46 × 1.8 — where does the decimal point go? (a) 0.0828 (b) 8.28 (c) 0.828 (d) 0.00828
  9. 9.4.5 × 3 — where does the decimal point go? (a) 1.35 (b) 13.5 (c) 135 (d) 0.135
  10. 10.0.73 × 1.4 — where does the decimal point go? (a) 10.22 (b) 0.1022 (c) 0.01022 (d) 1.022
  11. 11.8.7 × 7 — where does the decimal point go? (a) 6.09 (b) 60.9 (c) 609 (d) 0.609
  12. 12.4.2 × 22 — where does the decimal point go? (a) 92.4 (b) 0.924 (c) 9.24 (d) 924
  13. 13.8.4 × 29 — where does the decimal point go? (a) 2.436 (b) 2436 (c) 24.36 (d) 243.6
  14. 14.5.5 × 0.3 — where does the decimal point go? (a) 1.65 (b) 0.0165 (c) 0.165 (d) 16.5
  15. 15.0.28 × 3.1 — where does the decimal point go? (a) 0.00868 (b) 0.0868 (c) 8.68 (d) 0.868
  16. 16.0.34 × 0.4 — where does the decimal point go? (a) 0.136 (b) 1.36 (c) 0.0136 (d) 0.00136
  17. 17.2.9 × 3 — where does the decimal point go? (a) 8.7 (b) 87 (c) 0.87 (d) 0.087
  18. 18.0.97 × 0.8 — where does the decimal point go? (a) 7.76 (b) 0.0776 (c) 0.00776 (d) 0.776
  19. 19.3.5 × 37 — where does the decimal point go? (a) 129.5 (b) 1.295 (c) 1295 (d) 12.95
  20. 20.1.2 × 6 — where does the decimal point go? (a) 72 (b) 0.72 (c) 7.2 (d) 0.072
  21. 21.2.9 × 0.3 — where does the decimal point go? (a) 0.87 (b) 0.0087 (c) 0.087 (d) 8.7
  22. 22.0.33 × 0.4 — where does the decimal point go? (a) 1.32 (b) 0.00132 (c) 0.0132 (d) 0.132
  23. 23.0.54 × 2 — where does the decimal point go? (a) 1.08 (b) 0.108 (c) 0.0108 (d) 10.8
  24. 24.8.2 × 8 — where does the decimal point go? (a) 6.56 (b) 0.656 (c) 656 (d) 65.6
  25. 25.0.73 × 3 — where does the decimal point go? (a) 2.19 (b) 0.219 (c) 0.0219 (d) 21.9
  26. 26.0.17 × 0.7 — where does the decimal point go? (a) 0.0119 (b) 1.19 (c) 0.119 (d) 0.00119
  27. 27.4.9 × 0.3 — where does the decimal point go? (a) 1.47 (b) 14.7 (c) 0.0147 (d) 0.147
  28. 28.8.7 × 1.4 — where does the decimal point go? (a) 1.218 (b) 121.8 (c) 0.1218 (d) 12.18
  29. 29.5.8 × 3.2 — where does the decimal point go? (a) 0.1856 (b) 1.856 (c) 18.56 (d) 185.6
  30. 30.8.7 × 2.4 — where does the decimal point go? (a) 20.88 (b) 208.8 (c) 0.2088 (d) 2.088
  31. 31.9.9 × 8 — where does the decimal point go? (a) 7.92 (b) 792 (c) 79.2 (d) 0.792
  32. 32.7.9 × 0.7 — where does the decimal point go? (a) 0.553 (b) 0.0553 (c) 55.3 (d) 5.53
  33. 33.0.68 × 4.6 — where does the decimal point go? (a) 0.03128 (b) 0.3128 (c) 31.28 (d) 3.128
  34. 34.0.94 × 7 — where does the decimal point go? (a) 0.658 (b) 6.58 (c) 65.8 (d) 0.0658
  35. 35.0.53 × 21 — where does the decimal point go? (a) 11.13 (b) 111.3 (c) 0.1113 (d) 1.113
  36. 36.9.4 × 3.7 — where does the decimal point go? (a) 3.478 (b) 34.78 (c) 347.8 (d) 0.3478
  37. 37.0.53 × 0.2 — where does the decimal point go? (a) 0.106 (b) 0.0106 (c) 1.06 (d) 0.00106
  38. 38.7.4 × 1.8 — where does the decimal point go? (a) 0.1332 (b) 13.32 (c) 133.2 (d) 1.332
  39. 39.5.1 × 31 — where does the decimal point go? (a) 15.81 (b) 1.581 (c) 158.1 (d) 1581
  40. 40.0.73 × 14 — where does the decimal point go? (a) 0.1022 (b) 1.022 (c) 102.2 (d) 10.22

Answer key

  1. 31.82
  2. 1.83
  3. 33.54
  4. 2.61
  5. 1.76
  6. 10.8
  7. 0.285
  8. 0.828
  9. 13.5
  10. 1.022
  11. 60.9
  12. 92.4
  13. 243.6
  14. 1.65
  15. 0.868
  16. 0.136
  17. 8.7
  18. 0.776
  19. 129.5
  20. 7.2
  21. 0.87
  22. 0.132
  23. 1.08
  24. 65.6
  25. 2.19
  26. 0.119
  27. 1.47
  28. 12.18
  29. 18.56
  30. 20.88
  31. 79.2
  32. 5.53
  33. 3.128
  34. 6.58
  35. 11.13
  36. 34.78
  37. 0.106
  38. 13.32
  39. 158.1
  40. 10.22

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