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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 100 · 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. 1.0.41 × 0.2 — where does the decimal point go? (a) 0.00082 (b) 0.82 (c) 0.0082 (d) 0.082
  2. 2.0.29 × 2.7 — where does the decimal point go? (a) 0.0783 (b) 7.83 (c) 0.783 (d) 0.00783
  3. 3.1.4 × 1.3 — where does the decimal point go? (a) 0.0182 (b) 0.182 (c) 1.82 (d) 18.2
  4. 4.0.96 × 12 — where does the decimal point go? (a) 1.152 (b) 115.2 (c) 0.1152 (d) 11.52
  5. 5.6.3 × 16 — where does the decimal point go? (a) 1.008 (b) 10.08 (c) 1008 (d) 100.8
  6. 6.0.19 × 2 — where does the decimal point go? (a) 0.38 (b) 3.8 (c) 0.038 (d) 0.0038
  7. 7.0.31 × 0.6 — where does the decimal point go? (a) 1.86 (b) 0.0186 (c) 0.00186 (d) 0.186
  8. 8.2.4 × 6 — where does the decimal point go? (a) 14.4 (b) 0.144 (c) 1.44 (d) 144
  9. 9.2.9 × 41 — where does the decimal point go? (a) 1.189 (b) 118.9 (c) 11.89 (d) 1189
  10. 10.7.1 × 0.3 — where does the decimal point go? (a) 21.3 (b) 0.0213 (c) 2.13 (d) 0.213
  11. 11.1.2 × 3 — where does the decimal point go? (a) 0.036 (b) 3.6 (c) 0.36 (d) 36
  12. 12.0.82 × 1.3 — where does the decimal point go? (a) 1.066 (b) 0.1066 (c) 0.01066 (d) 10.66
  13. 13.2.2 × 3 — where does the decimal point go? (a) 0.66 (b) 66 (c) 6.6 (d) 0.066
  14. 14.9.2 × 7 — where does the decimal point go? (a) 64.4 (b) 6.44 (c) 0.644 (d) 644
  15. 15.0.35 × 21 — where does the decimal point go? (a) 0.735 (b) 73.5 (c) 7.35 (d) 0.0735
  16. 16.2.3 × 7 — where does the decimal point go? (a) 16.1 (b) 1.61 (c) 0.161 (d) 161
  17. 17.0.26 × 2.7 — where does the decimal point go? (a) 0.00702 (b) 0.0702 (c) 0.702 (d) 7.02
  18. 18.6.7 × 49 — where does the decimal point go? (a) 328.3 (b) 32.83 (c) 3.283 (d) 3283
  19. 19.4.3 × 5 — where does the decimal point go? (a) 0.215 (b) 2.15 (c) 21.5 (d) 215
  20. 20.6.7 × 0.4 — where does the decimal point go? (a) 26.8 (b) 0.0268 (c) 2.68 (d) 0.268
  21. 21.1.7 × 1.7 — where does the decimal point go? (a) 2.89 (b) 0.289 (c) 28.9 (d) 0.0289
  22. 22.0.89 × 4 — where does the decimal point go? (a) 0.356 (b) 3.56 (c) 0.0356 (d) 35.6
  23. 23.0.99 × 7 — where does the decimal point go? (a) 0.0693 (b) 6.93 (c) 69.3 (d) 0.693
  24. 24.9.6 × 4 — where does the decimal point go? (a) 3.84 (b) 384 (c) 0.384 (d) 38.4
  25. 25.6.9 × 2 — where does the decimal point go? (a) 13.8 (b) 138 (c) 1.38 (d) 0.138
  26. 26.2.8 × 2 — where does the decimal point go? (a) 0.56 (b) 56 (c) 5.6 (d) 0.056
  27. 27.5.1 × 1.4 — where does the decimal point go? (a) 7.14 (b) 0.0714 (c) 71.4 (d) 0.714
  28. 28.4.2 × 3.2 — where does the decimal point go? (a) 13.44 (b) 0.1344 (c) 1.344 (d) 134.4
  29. 29.7.4 × 2 — where does the decimal point go? (a) 148 (b) 1.48 (c) 14.8 (d) 0.148
  30. 30.7.2 × 0.9 — where does the decimal point go? (a) 64.8 (b) 0.0648 (c) 0.648 (d) 6.48
  31. 31.4.7 × 1.4 — where does the decimal point go? (a) 0.658 (b) 6.58 (c) 0.0658 (d) 65.8
  32. 32.4.4 × 16 — where does the decimal point go? (a) 7.04 (b) 0.704 (c) 70.4 (d) 704
  33. 33.0.56 × 0.7 — where does the decimal point go? (a) 0.00392 (b) 3.92 (c) 0.0392 (d) 0.392
  34. 34.8.6 × 1.4 — where does the decimal point go? (a) 0.1204 (b) 120.4 (c) 1.204 (d) 12.04
  35. 35.0.14 × 0.3 — where does the decimal point go? (a) 0.0042 (b) 0.42 (c) 0.042 (d) 0.00042
  36. 36.1.9 × 4.1 — where does the decimal point go? (a) 77.9 (b) 7.79 (c) 0.0779 (d) 0.779
  37. 37.9.4 × 0.3 — where does the decimal point go? (a) 2.82 (b) 0.282 (c) 0.0282 (d) 28.2
  38. 38.0.46 × 33 — where does the decimal point go? (a) 15.18 (b) 151.8 (c) 0.1518 (d) 1.518
  39. 39.7.7 × 5 — where does the decimal point go? (a) 38.5 (b) 0.385 (c) 385 (d) 3.85
  40. 40.0.56 × 3.4 — where does the decimal point go? (a) 0.1904 (b) 1.904 (c) 0.01904 (d) 19.04

Answer key

  1. 0.082
  2. 0.783
  3. 1.82
  4. 11.52
  5. 100.8
  6. 0.38
  7. 0.186
  8. 14.4
  9. 118.9
  10. 2.13
  11. 3.6
  12. 1.066
  13. 6.6
  14. 64.4
  15. 7.35
  16. 16.1
  17. 0.702
  18. 328.3
  19. 21.5
  20. 2.68
  21. 2.89
  22. 3.56
  23. 6.93
  24. 38.4
  25. 13.8
  26. 5.6
  27. 7.14
  28. 13.44
  29. 14.8
  30. 6.48
  31. 6.58
  32. 70.4
  33. 0.392
  34. 12.04
  35. 0.042
  36. 7.79
  37. 2.82
  38. 15.18
  39. 38.5
  40. 1.904

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