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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 92 · 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. 1.5.2 × 2 — where does the decimal point go? (a) 10.4 (b) 0.104 (c) 1.04 (d) 104
  2. 2.0.25 × 0.5 — where does the decimal point go? (a) 1.25 (b) 0.125 (c) 0.00125 (d) 0.0125
  3. 3.3.2 × 0.9 — where does the decimal point go? (a) 2.88 (b) 0.288 (c) 0.0288 (d) 28.8
  4. 4.6.1 × 8 — where does the decimal point go? (a) 0.488 (b) 488 (c) 4.88 (d) 48.8
  5. 5.2.1 × 7 — where does the decimal point go? (a) 147 (b) 0.147 (c) 14.7 (d) 1.47
  6. 6.4.1 × 39 — where does the decimal point go? (a) 15.99 (b) 1599 (c) 1.599 (d) 159.9
  7. 7.0.42 × 4.3 — where does the decimal point go? (a) 0.01806 (b) 18.06 (c) 1.806 (d) 0.1806
  8. 8.1.2 × 37 — where does the decimal point go? (a) 0.444 (b) 4.44 (c) 444 (d) 44.4
  9. 9.8.6 × 3.7 — where does the decimal point go? (a) 31.82 (b) 318.2 (c) 0.3182 (d) 3.182
  10. 10.0.33 × 1.1 — where does the decimal point go? (a) 3.63 (b) 0.0363 (c) 0.00363 (d) 0.363
  11. 11.8.2 × 11 — where does the decimal point go? (a) 9.02 (b) 902 (c) 0.902 (d) 90.2
  12. 12.0.85 × 11 — where does the decimal point go? (a) 0.935 (b) 9.35 (c) 93.5 (d) 0.0935
  13. 13.5.1 × 0.7 — where does the decimal point go? (a) 35.7 (b) 0.357 (c) 0.0357 (d) 3.57
  14. 14.0.89 × 0.7 — where does the decimal point go? (a) 0.00623 (b) 6.23 (c) 0.0623 (d) 0.623
  15. 15.2.1 × 31 — where does the decimal point go? (a) 6.51 (b) 0.651 (c) 651 (d) 65.1
  16. 16.2.4 × 0.9 — where does the decimal point go? (a) 21.6 (b) 0.0216 (c) 2.16 (d) 0.216
  17. 17.0.56 × 0.2 — where does the decimal point go? (a) 0.00112 (b) 0.0112 (c) 0.112 (d) 1.12
  18. 18.5.7 × 1.9 — where does the decimal point go? (a) 0.1083 (b) 1.083 (c) 108.3 (d) 10.83
  19. 19.3.8 × 0.9 — where does the decimal point go? (a) 3.42 (b) 0.0342 (c) 0.342 (d) 34.2
  20. 20.8.2 × 6 — where does the decimal point go? (a) 492 (b) 49.2 (c) 4.92 (d) 0.492
  21. 21.3.2 × 2 — where does the decimal point go? (a) 6.4 (b) 64 (c) 0.64 (d) 0.064
  22. 22.8.7 × 8 — where does the decimal point go? (a) 69.6 (b) 0.696 (c) 696 (d) 6.96
  23. 23.0.75 × 5 — where does the decimal point go? (a) 0.375 (b) 0.0375 (c) 3.75 (d) 37.5
  24. 24.4.9 × 2.9 — where does the decimal point go? (a) 142.1 (b) 1.421 (c) 14.21 (d) 0.1421
  25. 25.0.61 × 0.6 — where does the decimal point go? (a) 0.0366 (b) 0.00366 (c) 0.366 (d) 3.66
  26. 26.0.98 × 0.2 — where does the decimal point go? (a) 0.196 (b) 1.96 (c) 0.00196 (d) 0.0196
  27. 27.5.8 × 6 — where does the decimal point go? (a) 348 (b) 0.348 (c) 3.48 (d) 34.8
  28. 28.0.44 × 0.3 — where does the decimal point go? (a) 0.0132 (b) 0.00132 (c) 1.32 (d) 0.132
  29. 29.0.27 × 0.2 — where does the decimal point go? (a) 0.054 (b) 0.54 (c) 0.0054 (d) 0.00054
  30. 30.8.7 × 9 — where does the decimal point go? (a) 78.3 (b) 7.83 (c) 0.783 (d) 783
  31. 31.6.5 × 17 — where does the decimal point go? (a) 11.05 (b) 1105 (c) 1.105 (d) 110.5
  32. 32.0.46 × 3.1 — where does the decimal point go? (a) 1.426 (b) 0.1426 (c) 14.26 (d) 0.01426
  33. 33.0.86 × 0.3 — where does the decimal point go? (a) 0.00258 (b) 0.258 (c) 2.58 (d) 0.0258
  34. 34.1.5 × 37 — where does the decimal point go? (a) 555 (b) 0.555 (c) 5.55 (d) 55.5
  35. 35.2.2 × 0.7 — where does the decimal point go? (a) 0.0154 (b) 1.54 (c) 0.154 (d) 15.4
  36. 36.0.82 × 3 — where does the decimal point go? (a) 0.246 (b) 2.46 (c) 24.6 (d) 0.0246
  37. 37.0.54 × 4 — where does the decimal point go? (a) 0.216 (b) 0.0216 (c) 2.16 (d) 21.6
  38. 38.9.7 × 34 — where does the decimal point go? (a) 3.298 (b) 32.98 (c) 329.8 (d) 3298
  39. 39.2.8 × 1.3 — where does the decimal point go? (a) 0.0364 (b) 0.364 (c) 3.64 (d) 36.4
  40. 40.0.99 × 1.4 — where does the decimal point go? (a) 0.1386 (b) 1.386 (c) 13.86 (d) 0.01386

Answer key

  1. 10.4
  2. 0.125
  3. 2.88
  4. 48.8
  5. 14.7
  6. 159.9
  7. 1.806
  8. 44.4
  9. 31.82
  10. 0.363
  11. 90.2
  12. 9.35
  13. 3.57
  14. 0.623
  15. 65.1
  16. 2.16
  17. 0.112
  18. 10.83
  19. 3.42
  20. 49.2
  21. 6.4
  22. 69.6
  23. 3.75
  24. 14.21
  25. 0.366
  26. 0.196
  27. 34.8
  28. 0.132
  29. 0.054
  30. 78.3
  31. 110.5
  32. 1.426
  33. 0.258
  34. 55.5
  35. 1.54
  36. 2.46
  37. 2.16
  38. 329.8
  39. 3.64
  40. 1.386

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