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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 540 · 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. 1.0.21 × 4.5 — where does the decimal point go? (a) 0.945 (b) 9.45 (c) 0.00945 (d) 0.0945
  2. 2.7.9 × 9 — where does the decimal point go? (a) 0.711 (b) 71.1 (c) 7.11 (d) 711
  3. 3.9.9 × 0.8 — where does the decimal point go? (a) 7.92 (b) 0.792 (c) 79.2 (d) 0.0792
  4. 4.0.74 × 0.2 — where does the decimal point go? (a) 0.00148 (b) 0.148 (c) 0.0148 (d) 1.48
  5. 5.1.3 × 9 — where does the decimal point go? (a) 1.17 (b) 117 (c) 11.7 (d) 0.117
  6. 6.0.66 × 46 — where does the decimal point go? (a) 3.036 (b) 0.3036 (c) 303.6 (d) 30.36
  7. 7.2.7 × 0.6 — where does the decimal point go? (a) 1.62 (b) 0.162 (c) 16.2 (d) 0.0162
  8. 8.0.47 × 2 — where does the decimal point go? (a) 0.094 (b) 0.0094 (c) 9.4 (d) 0.94
  9. 9.9.9 × 0.2 — where does the decimal point go? (a) 19.8 (b) 0.0198 (c) 0.198 (d) 1.98
  10. 10.8.2 × 0.8 — where does the decimal point go? (a) 65.6 (b) 0.0656 (c) 6.56 (d) 0.656
  11. 11.3.8 × 19 — where does the decimal point go? (a) 7.22 (b) 722 (c) 72.2 (d) 0.722
  12. 12.2.8 × 1.2 — where does the decimal point go? (a) 3.36 (b) 33.6 (c) 0.336 (d) 0.0336
  13. 13.0.73 × 28 — where does the decimal point go? (a) 2.044 (b) 0.2044 (c) 20.44 (d) 204.4
  14. 14.0.24 × 12 — where does the decimal point go? (a) 28.8 (b) 2.88 (c) 0.0288 (d) 0.288
  15. 15.0.75 × 3.9 — where does the decimal point go? (a) 0.2925 (b) 2.925 (c) 0.02925 (d) 29.25
  16. 16.8.3 × 4 — where does the decimal point go? (a) 33.2 (b) 3.32 (c) 0.332 (d) 332
  17. 17.1.3 × 0.2 — where does the decimal point go? (a) 2.6 (b) 0.026 (c) 0.0026 (d) 0.26
  18. 18.2.4 × 2 — where does the decimal point go? (a) 0.48 (b) 0.048 (c) 48 (d) 4.8
  19. 19.3.7 × 0.3 — where does the decimal point go? (a) 0.0111 (b) 0.111 (c) 1.11 (d) 11.1
  20. 20.0.51 × 5 — where does the decimal point go? (a) 25.5 (b) 0.0255 (c) 0.255 (d) 2.55
  21. 21.0.56 × 2 — where does the decimal point go? (a) 11.2 (b) 0.0112 (c) 1.12 (d) 0.112
  22. 22.4.2 × 22 — where does the decimal point go? (a) 0.924 (b) 924 (c) 9.24 (d) 92.4
  23. 23.1.7 × 9 — where does the decimal point go? (a) 15.3 (b) 1.53 (c) 153 (d) 0.153
  24. 24.0.39 × 8 — where does the decimal point go? (a) 3.12 (b) 0.0312 (c) 31.2 (d) 0.312
  25. 25.0.69 × 4.4 — where does the decimal point go? (a) 0.03036 (b) 30.36 (c) 0.3036 (d) 3.036
  26. 26.2.1 × 11 — where does the decimal point go? (a) 0.231 (b) 231 (c) 2.31 (d) 23.1
  27. 27.1.7 × 31 — where does the decimal point go? (a) 0.527 (b) 52.7 (c) 5.27 (d) 527
  28. 28.0.97 × 14 — where does the decimal point go? (a) 13.58 (b) 0.1358 (c) 1.358 (d) 135.8
  29. 29.4.4 × 4.1 — where does the decimal point go? (a) 1.804 (b) 18.04 (c) 0.1804 (d) 180.4
  30. 30.0.23 × 0.2 — where does the decimal point go? (a) 0.46 (b) 0.046 (c) 0.0046 (d) 0.00046
  31. 31.3.3 × 4.8 — where does the decimal point go? (a) 158.4 (b) 1.584 (c) 15.84 (d) 0.1584
  32. 32.0.97 × 6 — where does the decimal point go? (a) 0.582 (b) 0.0582 (c) 58.2 (d) 5.82
  33. 33.1.7 × 2 — where does the decimal point go? (a) 34 (b) 0.034 (c) 0.34 (d) 3.4
  34. 34.5.7 × 0.9 — where does the decimal point go? (a) 0.513 (b) 51.3 (c) 0.0513 (d) 5.13
  35. 35.3.2 × 3 — where does the decimal point go? (a) 0.96 (b) 0.096 (c) 96 (d) 9.6
  36. 36.1.8 × 6 — where does the decimal point go? (a) 108 (b) 1.08 (c) 10.8 (d) 0.108
  37. 37.8.3 × 0.6 — where does the decimal point go? (a) 4.98 (b) 49.8 (c) 0.0498 (d) 0.498
  38. 38.0.34 × 1.6 — where does the decimal point go? (a) 0.0544 (b) 0.00544 (c) 5.44 (d) 0.544
  39. 39.0.84 × 2.7 — where does the decimal point go? (a) 22.68 (b) 0.02268 (c) 2.268 (d) 0.2268
  40. 40.9.3 × 2 — where does the decimal point go? (a) 0.186 (b) 186 (c) 1.86 (d) 18.6

Answer key

  1. 0.945
  2. 71.1
  3. 7.92
  4. 0.148
  5. 11.7
  6. 30.36
  7. 1.62
  8. 0.94
  9. 1.98
  10. 6.56
  11. 72.2
  12. 3.36
  13. 20.44
  14. 2.88
  15. 2.925
  16. 33.2
  17. 0.26
  18. 4.8
  19. 1.11
  20. 2.55
  21. 1.12
  22. 92.4
  23. 15.3
  24. 3.12
  25. 3.036
  26. 23.1
  27. 52.7
  28. 13.58
  29. 18.04
  30. 0.046
  31. 15.84
  32. 5.82
  33. 3.4
  34. 5.13
  35. 9.6
  36. 10.8
  37. 4.98
  38. 0.544
  39. 2.268
  40. 18.6

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