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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 58 · 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. 1.7.9 × 4 — where does the decimal point go? (a) 0.316 (b) 3.16 (c) 316 (d) 31.6
  2. 2.0.83 × 0.7 — where does the decimal point go? (a) 0.581 (b) 0.00581 (c) 5.81 (d) 0.0581
  3. 3.4.5 × 3.5 — where does the decimal point go? (a) 15.75 (b) 1.575 (c) 157.5 (d) 0.1575
  4. 4.2.8 × 0.3 — where does the decimal point go? (a) 0.0084 (b) 8.4 (c) 0.84 (d) 0.084
  5. 5.4.2 × 44 — where does the decimal point go? (a) 1.848 (b) 184.8 (c) 18.48 (d) 1848
  6. 6.5.8 × 0.6 — where does the decimal point go? (a) 3.48 (b) 0.348 (c) 0.0348 (d) 34.8
  7. 7.5.1 × 36 — where does the decimal point go? (a) 1.836 (b) 183.6 (c) 18.36 (d) 1836
  8. 8.4.3 × 27 — where does the decimal point go? (a) 11.61 (b) 116.1 (c) 1161 (d) 1.161
  9. 9.5.5 × 19 — where does the decimal point go? (a) 104.5 (b) 1.045 (c) 10.45 (d) 1045
  10. 10.0.37 × 0.6 — where does the decimal point go? (a) 2.22 (b) 0.00222 (c) 0.222 (d) 0.0222
  11. 11.2.2 × 41 — where does the decimal point go? (a) 9.02 (b) 902 (c) 0.902 (d) 90.2
  12. 12.0.92 × 4.9 — where does the decimal point go? (a) 45.08 (b) 0.4508 (c) 4.508 (d) 0.04508
  13. 13.0.22 × 2.9 — where does the decimal point go? (a) 0.638 (b) 0.00638 (c) 6.38 (d) 0.0638
  14. 14.0.48 × 9 — where does the decimal point go? (a) 4.32 (b) 43.2 (c) 0.0432 (d) 0.432
  15. 15.4.1 × 7 — where does the decimal point go? (a) 2.87 (b) 0.287 (c) 287 (d) 28.7
  16. 16.7.9 × 24 — where does the decimal point go? (a) 1896 (b) 18.96 (c) 1.896 (d) 189.6
  17. 17.5.6 × 1.8 — where does the decimal point go? (a) 1.008 (b) 0.1008 (c) 100.8 (d) 10.08
  18. 18.5.8 × 1.3 — where does the decimal point go? (a) 0.0754 (b) 7.54 (c) 0.754 (d) 75.4
  19. 19.9.7 × 9 — where does the decimal point go? (a) 873 (b) 87.3 (c) 0.873 (d) 8.73
  20. 20.3.1 × 6 — where does the decimal point go? (a) 1.86 (b) 186 (c) 0.186 (d) 18.6
  21. 21.1.6 × 2 — where does the decimal point go? (a) 0.032 (b) 32 (c) 0.32 (d) 3.2
  22. 22.7.2 × 16 — where does the decimal point go? (a) 1152 (b) 11.52 (c) 1.152 (d) 115.2
  23. 23.8.8 × 3 — where does the decimal point go? (a) 2.64 (b) 26.4 (c) 0.264 (d) 264
  24. 24.0.27 × 3.9 — where does the decimal point go? (a) 10.53 (b) 0.01053 (c) 1.053 (d) 0.1053
  25. 25.0.28 × 4.3 — where does the decimal point go? (a) 0.01204 (b) 1.204 (c) 12.04 (d) 0.1204
  26. 26.3.9 × 0.8 — where does the decimal point go? (a) 0.312 (b) 3.12 (c) 31.2 (d) 0.0312
  27. 27.4.7 × 28 — where does the decimal point go? (a) 131.6 (b) 1.316 (c) 1316 (d) 13.16
  28. 28.0.92 × 3 — where does the decimal point go? (a) 0.0276 (b) 0.276 (c) 27.6 (d) 2.76
  29. 29.0.83 × 2.6 — where does the decimal point go? (a) 0.02158 (b) 21.58 (c) 2.158 (d) 0.2158
  30. 30.2.9 × 4.6 — where does the decimal point go? (a) 13.34 (b) 1.334 (c) 133.4 (d) 0.1334
  31. 31.6.2 × 0.8 — where does the decimal point go? (a) 49.6 (b) 0.496 (c) 4.96 (d) 0.0496
  32. 32.0.72 × 0.8 — where does the decimal point go? (a) 0.0576 (b) 5.76 (c) 0.576 (d) 0.00576
  33. 33.9.8 × 2.8 — where does the decimal point go? (a) 0.2744 (b) 274.4 (c) 27.44 (d) 2.744
  34. 34.0.67 × 5 — where does the decimal point go? (a) 3.35 (b) 33.5 (c) 0.0335 (d) 0.335
  35. 35.7.7 × 48 — where does the decimal point go? (a) 369.6 (b) 3.696 (c) 3696 (d) 36.96
  36. 36.5.2 × 0.6 — where does the decimal point go? (a) 0.0312 (b) 0.312 (c) 3.12 (d) 31.2
  37. 37.0.52 × 0.7 — where does the decimal point go? (a) 3.64 (b) 0.364 (c) 0.00364 (d) 0.0364
  38. 38.0.18 × 2.1 — where does the decimal point go? (a) 0.00378 (b) 0.0378 (c) 0.378 (d) 3.78
  39. 39.4.4 × 7 — where does the decimal point go? (a) 308 (b) 3.08 (c) 0.308 (d) 30.8
  40. 40.7.7 × 8 — where does the decimal point go? (a) 61.6 (b) 616 (c) 6.16 (d) 0.616

Answer key

  1. 31.6
  2. 0.581
  3. 15.75
  4. 0.84
  5. 184.8
  6. 3.48
  7. 183.6
  8. 116.1
  9. 104.5
  10. 0.222
  11. 90.2
  12. 4.508
  13. 0.638
  14. 4.32
  15. 28.7
  16. 189.6
  17. 10.08
  18. 7.54
  19. 87.3
  20. 18.6
  21. 3.2
  22. 115.2
  23. 26.4
  24. 1.053
  25. 1.204
  26. 3.12
  27. 131.6
  28. 2.76
  29. 2.158
  30. 13.34
  31. 4.96
  32. 0.576
  33. 27.44
  34. 3.35
  35. 369.6
  36. 3.12
  37. 0.364
  38. 0.378
  39. 30.8
  40. 61.6

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