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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 286 · 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. 1.7.8 × 0.4 — where does the decimal point go? (a) 0.0312 (b) 31.2 (c) 0.312 (d) 3.12
  2. 2.0.25 × 17 — where does the decimal point go? (a) 0.0425 (b) 0.425 (c) 4.25 (d) 42.5
  3. 3.0.84 × 3 — where does the decimal point go? (a) 0.0252 (b) 25.2 (c) 0.252 (d) 2.52
  4. 4.2.1 × 2 — where does the decimal point go? (a) 0.042 (b) 0.42 (c) 42 (d) 4.2
  5. 5.4.3 × 0.6 — where does the decimal point go? (a) 0.258 (b) 2.58 (c) 25.8 (d) 0.0258
  6. 6.0.27 × 36 — where does the decimal point go? (a) 0.972 (b) 97.2 (c) 0.0972 (d) 9.72
  7. 7.6.6 × 0.7 — where does the decimal point go? (a) 46.2 (b) 0.0462 (c) 4.62 (d) 0.462
  8. 8.9.9 × 5 — where does the decimal point go? (a) 4.95 (b) 0.495 (c) 49.5 (d) 495
  9. 9.0.79 × 15 — where does the decimal point go? (a) 11.85 (b) 118.5 (c) 0.1185 (d) 1.185
  10. 10.1.4 × 4 — where does the decimal point go? (a) 5.6 (b) 0.56 (c) 56 (d) 0.056
  11. 11.3.2 × 0.2 — where does the decimal point go? (a) 0.0064 (b) 0.064 (c) 6.4 (d) 0.64
  12. 12.9.1 × 22 — where does the decimal point go? (a) 200.2 (b) 2.002 (c) 2002 (d) 20.02
  13. 13.0.56 × 3.9 — where does the decimal point go? (a) 0.02184 (b) 21.84 (c) 0.2184 (d) 2.184
  14. 14.7.8 × 0.7 — where does the decimal point go? (a) 0.546 (b) 54.6 (c) 0.0546 (d) 5.46
  15. 15.0.87 × 0.5 — where does the decimal point go? (a) 4.35 (b) 0.00435 (c) 0.0435 (d) 0.435
  16. 16.1.4 × 3.3 — where does the decimal point go? (a) 0.0462 (b) 0.462 (c) 46.2 (d) 4.62
  17. 17.0.16 × 9 — where does the decimal point go? (a) 0.0144 (b) 1.44 (c) 0.144 (d) 14.4
  18. 18.8.1 × 0.5 — where does the decimal point go? (a) 4.05 (b) 40.5 (c) 0.405 (d) 0.0405
  19. 19.3.4 × 2 — where does the decimal point go? (a) 6.8 (b) 0.68 (c) 68 (d) 0.068
  20. 20.0.32 × 0.3 — where does the decimal point go? (a) 0.096 (b) 0.00096 (c) 0.0096 (d) 0.96
  21. 21.3.9 × 6 — where does the decimal point go? (a) 234 (b) 23.4 (c) 2.34 (d) 0.234
  22. 22.0.27 × 4 — where does the decimal point go? (a) 1.08 (b) 10.8 (c) 0.108 (d) 0.0108
  23. 23.6.6 × 3 — where does the decimal point go? (a) 1.98 (b) 19.8 (c) 198 (d) 0.198
  24. 24.7.9 × 3.6 — where does the decimal point go? (a) 284.4 (b) 28.44 (c) 0.2844 (d) 2.844
  25. 25.1.9 × 0.8 — where does the decimal point go? (a) 0.0152 (b) 15.2 (c) 1.52 (d) 0.152
  26. 26.6.8 × 34 — where does the decimal point go? (a) 231.2 (b) 2312 (c) 2.312 (d) 23.12
  27. 27.3.3 × 44 — where does the decimal point go? (a) 145.2 (b) 1452 (c) 1.452 (d) 14.52
  28. 28.2.8 × 0.8 — where does the decimal point go? (a) 0.224 (b) 2.24 (c) 0.0224 (d) 22.4
  29. 29.9.9 × 3 — where does the decimal point go? (a) 2.97 (b) 29.7 (c) 297 (d) 0.297
  30. 30.2.7 × 2 — where does the decimal point go? (a) 0.54 (b) 0.054 (c) 54 (d) 5.4
  31. 31.0.24 × 2.6 — where does the decimal point go? (a) 0.0624 (b) 0.00624 (c) 6.24 (d) 0.624
  32. 32.5.4 × 0.2 — where does the decimal point go? (a) 0.0108 (b) 10.8 (c) 1.08 (d) 0.108
  33. 33.0.21 × 0.3 — where does the decimal point go? (a) 0.00063 (b) 0.63 (c) 0.0063 (d) 0.063
  34. 34.0.71 × 9 — where does the decimal point go? (a) 0.639 (b) 63.9 (c) 6.39 (d) 0.0639
  35. 35.6.4 × 26 — where does the decimal point go? (a) 166.4 (b) 1664 (c) 1.664 (d) 16.64
  36. 36.4.2 × 3.3 — where does the decimal point go? (a) 0.1386 (b) 1.386 (c) 13.86 (d) 138.6
  37. 37.8.1 × 2.2 — where does the decimal point go? (a) 17.82 (b) 1.782 (c) 178.2 (d) 0.1782
  38. 38.9.6 × 39 — where does the decimal point go? (a) 3.744 (b) 374.4 (c) 3744 (d) 37.44
  39. 39.0.49 × 2.8 — where does the decimal point go? (a) 0.1372 (b) 13.72 (c) 0.01372 (d) 1.372
  40. 40.1.6 × 2 — where does the decimal point go? (a) 3.2 (b) 0.032 (c) 32 (d) 0.32

Answer key

  1. 3.12
  2. 4.25
  3. 2.52
  4. 4.2
  5. 2.58
  6. 9.72
  7. 4.62
  8. 49.5
  9. 11.85
  10. 5.6
  11. 0.64
  12. 200.2
  13. 2.184
  14. 5.46
  15. 0.435
  16. 4.62
  17. 1.44
  18. 4.05
  19. 6.8
  20. 0.096
  21. 23.4
  22. 1.08
  23. 19.8
  24. 28.44
  25. 1.52
  26. 231.2
  27. 145.2
  28. 2.24
  29. 29.7
  30. 5.4
  31. 0.624
  32. 1.08
  33. 0.063
  34. 6.39
  35. 166.4
  36. 13.86
  37. 17.82
  38. 374.4
  39. 1.372
  40. 3.2

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