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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 170 · 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. 1.5.8 × 33 — where does the decimal point go? (a) 191.4 (b) 1.914 (c) 1914 (d) 19.14
  2. 2.2.3 × 2.4 — where does the decimal point go? (a) 0.552 (b) 55.2 (c) 0.0552 (d) 5.52
  3. 3.4.5 × 4.7 — where does the decimal point go? (a) 211.5 (b) 0.2115 (c) 2.115 (d) 21.15
  4. 4.7.8 × 0.2 — where does the decimal point go? (a) 0.0156 (b) 15.6 (c) 0.156 (d) 1.56
  5. 5.0.85 × 3 — where does the decimal point go? (a) 0.0255 (b) 0.255 (c) 2.55 (d) 25.5
  6. 6.2.2 × 7 — where does the decimal point go? (a) 15.4 (b) 1.54 (c) 0.154 (d) 154
  7. 7.0.62 × 8 — where does the decimal point go? (a) 0.0496 (b) 49.6 (c) 4.96 (d) 0.496
  8. 8.2.2 × 21 — where does the decimal point go? (a) 0.462 (b) 4.62 (c) 46.2 (d) 462
  9. 9.0.21 × 0.3 — where does the decimal point go? (a) 0.063 (b) 0.0063 (c) 0.00063 (d) 0.63
  10. 10.9.3 × 0.5 — where does the decimal point go? (a) 4.65 (b) 46.5 (c) 0.0465 (d) 0.465
  11. 11.2.7 × 3.3 — where does the decimal point go? (a) 0.0891 (b) 8.91 (c) 0.891 (d) 89.1
  12. 12.0.25 × 0.9 — where does the decimal point go? (a) 0.225 (b) 2.25 (c) 0.0225 (d) 0.00225
  13. 13.3.6 × 1.6 — where does the decimal point go? (a) 5.76 (b) 57.6 (c) 0.0576 (d) 0.576
  14. 14.4.2 × 1.9 — where does the decimal point go? (a) 0.0798 (b) 7.98 (c) 79.8 (d) 0.798
  15. 15.2.8 × 0.3 — where does the decimal point go? (a) 0.84 (b) 0.0084 (c) 0.084 (d) 8.4
  16. 16.2.4 × 0.3 — where does the decimal point go? (a) 0.072 (b) 0.72 (c) 0.0072 (d) 7.2
  17. 17.0.38 × 47 — where does the decimal point go? (a) 17.86 (b) 178.6 (c) 0.1786 (d) 1.786
  18. 18.3.6 × 2 — where does the decimal point go? (a) 7.2 (b) 0.072 (c) 72 (d) 0.72
  19. 19.3.9 × 44 — where does the decimal point go? (a) 171.6 (b) 1716 (c) 1.716 (d) 17.16
  20. 20.3.7 × 15 — where does the decimal point go? (a) 55.5 (b) 555 (c) 0.555 (d) 5.55
  21. 21.9.2 × 0.9 — where does the decimal point go? (a) 0.0828 (b) 0.828 (c) 82.8 (d) 8.28
  22. 22.0.15 × 7 — where does the decimal point go? (a) 0.0105 (b) 1.05 (c) 0.105 (d) 10.5
  23. 23.6.5 × 1.1 — where does the decimal point go? (a) 0.0715 (b) 7.15 (c) 0.715 (d) 71.5
  24. 24.3.3 × 4 — where does the decimal point go? (a) 1.32 (b) 13.2 (c) 0.132 (d) 132
  25. 25.0.79 × 2.6 — where does the decimal point go? (a) 0.2054 (b) 0.02054 (c) 20.54 (d) 2.054
  26. 26.0.75 × 9 — where does the decimal point go? (a) 0.0675 (b) 0.675 (c) 6.75 (d) 67.5
  27. 27.7.4 × 0.7 — where does the decimal point go? (a) 0.518 (b) 5.18 (c) 51.8 (d) 0.0518
  28. 28.1.3 × 4.5 — where does the decimal point go? (a) 0.0585 (b) 58.5 (c) 5.85 (d) 0.585
  29. 29.0.83 × 0.8 — where does the decimal point go? (a) 6.64 (b) 0.664 (c) 0.00664 (d) 0.0664
  30. 30.0.18 × 7 — where does the decimal point go? (a) 0.0126 (b) 1.26 (c) 12.6 (d) 0.126
  31. 31.0.83 × 4.4 — where does the decimal point go? (a) 36.52 (b) 0.3652 (c) 3.652 (d) 0.03652
  32. 32.0.89 × 0.2 — where does the decimal point go? (a) 0.0178 (b) 0.178 (c) 1.78 (d) 0.00178
  33. 33.0.16 × 7 — where does the decimal point go? (a) 11.2 (b) 0.0112 (c) 1.12 (d) 0.112
  34. 34.0.16 × 43 — where does the decimal point go? (a) 68.8 (b) 0.688 (c) 6.88 (d) 0.0688
  35. 35.5.8 × 22 — where does the decimal point go? (a) 1276 (b) 1.276 (c) 12.76 (d) 127.6
  36. 36.0.76 × 2.2 — where does the decimal point go? (a) 0.01672 (b) 0.1672 (c) 1.672 (d) 16.72
  37. 37.0.96 × 0.3 — where does the decimal point go? (a) 2.88 (b) 0.00288 (c) 0.288 (d) 0.0288
  38. 38.8.2 × 4 — where does the decimal point go? (a) 32.8 (b) 0.328 (c) 328 (d) 3.28
  39. 39.0.67 × 7 — where does the decimal point go? (a) 4.69 (b) 0.469 (c) 0.0469 (d) 46.9
  40. 40.0.21 × 2.4 — where does the decimal point go? (a) 0.0504 (b) 5.04 (c) 0.504 (d) 0.00504

Answer key

  1. 191.4
  2. 5.52
  3. 21.15
  4. 1.56
  5. 2.55
  6. 15.4
  7. 4.96
  8. 46.2
  9. 0.063
  10. 4.65
  11. 8.91
  12. 0.225
  13. 5.76
  14. 7.98
  15. 0.84
  16. 0.72
  17. 17.86
  18. 7.2
  19. 171.6
  20. 55.5
  21. 8.28
  22. 1.05
  23. 7.15
  24. 13.2
  25. 2.054
  26. 6.75
  27. 5.18
  28. 5.85
  29. 0.664
  30. 1.26
  31. 3.652
  32. 0.178
  33. 1.12
  34. 6.88
  35. 127.6
  36. 1.672
  37. 0.288
  38. 32.8
  39. 4.69
  40. 0.504

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