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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 547 · 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. 1.0.86 × 7 — where does the decimal point go? (a) 6.02 (b) 0.0602 (c) 60.2 (d) 0.602
  2. 2.3.8 × 8 — where does the decimal point go? (a) 3.04 (b) 0.304 (c) 304 (d) 30.4
  3. 3.0.52 × 0.9 — where does the decimal point go? (a) 0.0468 (b) 0.468 (c) 0.00468 (d) 4.68
  4. 4.2.6 × 16 — where does the decimal point go? (a) 41.6 (b) 0.416 (c) 416 (d) 4.16
  5. 5.2.4 × 0.8 — where does the decimal point go? (a) 19.2 (b) 1.92 (c) 0.192 (d) 0.0192
  6. 6.7.1 × 4 — where does the decimal point go? (a) 28.4 (b) 0.284 (c) 2.84 (d) 284
  7. 7.0.88 × 4.9 — where does the decimal point go? (a) 4.312 (b) 43.12 (c) 0.4312 (d) 0.04312
  8. 8.0.39 × 28 — where does the decimal point go? (a) 10.92 (b) 0.1092 (c) 109.2 (d) 1.092
  9. 9.3.1 × 1.6 — where does the decimal point go? (a) 0.0496 (b) 49.6 (c) 0.496 (d) 4.96
  10. 10.6.8 × 23 — where does the decimal point go? (a) 1564 (b) 156.4 (c) 15.64 (d) 1.564
  11. 11.0.37 × 0.9 — where does the decimal point go? (a) 3.33 (b) 0.0333 (c) 0.00333 (d) 0.333
  12. 12.7.7 × 8 — where does the decimal point go? (a) 6.16 (b) 61.6 (c) 0.616 (d) 616
  13. 13.0.49 × 2 — where does the decimal point go? (a) 0.98 (b) 0.098 (c) 0.0098 (d) 9.8
  14. 14.0.46 × 3 — where does the decimal point go? (a) 1.38 (b) 0.0138 (c) 13.8 (d) 0.138
  15. 15.0.79 × 0.8 — where does the decimal point go? (a) 0.632 (b) 6.32 (c) 0.00632 (d) 0.0632
  16. 16.2.6 × 36 — where does the decimal point go? (a) 0.936 (b) 936 (c) 9.36 (d) 93.6
  17. 17.4.9 × 1.2 — where does the decimal point go? (a) 0.588 (b) 0.0588 (c) 58.8 (d) 5.88
  18. 18.0.33 × 7 — where does the decimal point go? (a) 23.1 (b) 2.31 (c) 0.231 (d) 0.0231
  19. 19.0.59 × 7 — where does the decimal point go? (a) 41.3 (b) 4.13 (c) 0.0413 (d) 0.413
  20. 20.0.77 × 5 — where does the decimal point go? (a) 0.0385 (b) 38.5 (c) 3.85 (d) 0.385
  21. 21.0.13 × 5 — where does the decimal point go? (a) 6.5 (b) 0.0065 (c) 0.65 (d) 0.065
  22. 22.4.7 × 23 — where does the decimal point go? (a) 1.081 (b) 1081 (c) 108.1 (d) 10.81
  23. 23.2.8 × 6 — where does the decimal point go? (a) 16.8 (b) 168 (c) 1.68 (d) 0.168
  24. 24.1.6 × 2.4 — where does the decimal point go? (a) 38.4 (b) 0.384 (c) 3.84 (d) 0.0384
  25. 25.2.8 × 12 — where does the decimal point go? (a) 0.336 (b) 3.36 (c) 33.6 (d) 336
  26. 26.5.6 × 2 — where does the decimal point go? (a) 112 (b) 11.2 (c) 1.12 (d) 0.112
  27. 27.0.68 × 36 — where does the decimal point go? (a) 0.2448 (b) 244.8 (c) 24.48 (d) 2.448
  28. 28.0.57 × 47 — where does the decimal point go? (a) 2.679 (b) 0.2679 (c) 267.9 (d) 26.79
  29. 29.1.7 × 4 — where does the decimal point go? (a) 6.8 (b) 0.68 (c) 0.068 (d) 68
  30. 30.1.3 × 3 — where does the decimal point go? (a) 3.9 (b) 39 (c) 0.39 (d) 0.039
  31. 31.7.2 × 4.4 — where does the decimal point go? (a) 31.68 (b) 0.3168 (c) 3.168 (d) 316.8
  32. 32.8.7 × 0.8 — where does the decimal point go? (a) 69.6 (b) 0.0696 (c) 6.96 (d) 0.696
  33. 33.8.9 × 6 — where does the decimal point go? (a) 534 (b) 0.534 (c) 53.4 (d) 5.34
  34. 34.0.61 × 31 — where does the decimal point go? (a) 0.1891 (b) 189.1 (c) 18.91 (d) 1.891
  35. 35.3.1 × 9 — where does the decimal point go? (a) 279 (b) 0.279 (c) 2.79 (d) 27.9
  36. 36.3.9 × 0.2 — where does the decimal point go? (a) 0.78 (b) 0.0078 (c) 0.078 (d) 7.8
  37. 37.0.82 × 2.9 — where does the decimal point go? (a) 23.78 (b) 0.2378 (c) 2.378 (d) 0.02378
  38. 38.0.84 × 0.6 — where does the decimal point go? (a) 5.04 (b) 0.0504 (c) 0.504 (d) 0.00504
  39. 39.3.9 × 41 — where does the decimal point go? (a) 15.99 (b) 1.599 (c) 159.9 (d) 1599
  40. 40.0.18 × 1.6 — where does the decimal point go? (a) 0.00288 (b) 0.0288 (c) 0.288 (d) 2.88

Answer key

  1. 6.02
  2. 30.4
  3. 0.468
  4. 41.6
  5. 1.92
  6. 28.4
  7. 4.312
  8. 10.92
  9. 4.96
  10. 156.4
  11. 0.333
  12. 61.6
  13. 0.98
  14. 1.38
  15. 0.632
  16. 93.6
  17. 5.88
  18. 2.31
  19. 4.13
  20. 3.85
  21. 0.65
  22. 108.1
  23. 16.8
  24. 3.84
  25. 33.6
  26. 11.2
  27. 24.48
  28. 26.79
  29. 6.8
  30. 3.9
  31. 31.68
  32. 6.96
  33. 53.4
  34. 18.91
  35. 27.9
  36. 0.78
  37. 2.378
  38. 0.504
  39. 159.9
  40. 0.288

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