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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 738 · 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. 1.6.1 × 8 — where does the decimal point go? (a) 0.488 (b) 48.8 (c) 4.88 (d) 488
  2. 2.0.77 × 0.7 — where does the decimal point go? (a) 0.00539 (b) 0.539 (c) 5.39 (d) 0.0539
  3. 3.9.2 × 41 — where does the decimal point go? (a) 377.2 (b) 3.772 (c) 37.72 (d) 3772
  4. 4.9.2 × 4 — where does the decimal point go? (a) 3.68 (b) 368 (c) 36.8 (d) 0.368
  5. 5.0.95 × 0.5 — where does the decimal point go? (a) 0.0475 (b) 0.00475 (c) 0.475 (d) 4.75
  6. 6.0.71 × 42 — where does the decimal point go? (a) 29.82 (b) 2.982 (c) 0.2982 (d) 298.2
  7. 7.0.49 × 2 — where does the decimal point go? (a) 0.98 (b) 0.098 (c) 9.8 (d) 0.0098
  8. 8.0.41 × 0.8 — where does the decimal point go? (a) 0.328 (b) 0.0328 (c) 0.00328 (d) 3.28
  9. 9.9.8 × 37 — where does the decimal point go? (a) 3626 (b) 3.626 (c) 36.26 (d) 362.6
  10. 10.1.7 × 3.7 — where does the decimal point go? (a) 6.29 (b) 0.0629 (c) 62.9 (d) 0.629
  11. 11.7.7 × 1.4 — where does the decimal point go? (a) 0.1078 (b) 10.78 (c) 1.078 (d) 107.8
  12. 12.4.8 × 0.6 — where does the decimal point go? (a) 28.8 (b) 0.0288 (c) 2.88 (d) 0.288
  13. 13.0.67 × 0.4 — where does the decimal point go? (a) 0.268 (b) 2.68 (c) 0.0268 (d) 0.00268
  14. 14.7.2 × 0.8 — where does the decimal point go? (a) 57.6 (b) 0.576 (c) 5.76 (d) 0.0576
  15. 15.0.14 × 2.7 — where does the decimal point go? (a) 0.0378 (b) 3.78 (c) 0.00378 (d) 0.378
  16. 16.5.9 × 3.9 — where does the decimal point go? (a) 0.2301 (b) 230.1 (c) 23.01 (d) 2.301
  17. 17.5.1 × 16 — where does the decimal point go? (a) 816 (b) 0.816 (c) 81.6 (d) 8.16
  18. 18.4.5 × 3.5 — where does the decimal point go? (a) 157.5 (b) 15.75 (c) 0.1575 (d) 1.575
  19. 19.7.2 × 3 — where does the decimal point go? (a) 2.16 (b) 216 (c) 21.6 (d) 0.216
  20. 20.6.1 × 24 — where does the decimal point go? (a) 1464 (b) 1.464 (c) 14.64 (d) 146.4
  21. 21.1.4 × 0.8 — where does the decimal point go? (a) 1.12 (b) 0.112 (c) 11.2 (d) 0.0112
  22. 22.8.4 × 3 — where does the decimal point go? (a) 2.52 (b) 0.252 (c) 252 (d) 25.2
  23. 23.1.2 × 0.9 — where does the decimal point go? (a) 1.08 (b) 0.108 (c) 0.0108 (d) 10.8
  24. 24.8.9 × 15 — where does the decimal point go? (a) 133.5 (b) 1.335 (c) 1335 (d) 13.35
  25. 25.2.5 × 25 — where does the decimal point go? (a) 625 (b) 62.5 (c) 0.625 (d) 6.25
  26. 26.0.79 × 0.4 — where does the decimal point go? (a) 3.16 (b) 0.0316 (c) 0.316 (d) 0.00316
  27. 27.3.7 × 6 — where does the decimal point go? (a) 0.222 (b) 22.2 (c) 2.22 (d) 222
  28. 28.0.47 × 7 — where does the decimal point go? (a) 3.29 (b) 0.329 (c) 0.0329 (d) 32.9
  29. 29.4.1 × 28 — where does the decimal point go? (a) 1.148 (b) 1148 (c) 11.48 (d) 114.8
  30. 30.0.21 × 3 — where does the decimal point go? (a) 0.063 (b) 6.3 (c) 0.63 (d) 0.0063
  31. 31.0.71 × 3.6 — where does the decimal point go? (a) 0.02556 (b) 2.556 (c) 0.2556 (d) 25.56
  32. 32.2.9 × 3.6 — where does the decimal point go? (a) 104.4 (b) 1.044 (c) 0.1044 (d) 10.44
  33. 33.0.32 × 8 — where does the decimal point go? (a) 0.256 (b) 0.0256 (c) 2.56 (d) 25.6
  34. 34.0.79 × 8 — where does the decimal point go? (a) 0.632 (b) 63.2 (c) 6.32 (d) 0.0632
  35. 35.3.7 × 0.7 — where does the decimal point go? (a) 0.0259 (b) 2.59 (c) 0.259 (d) 25.9
  36. 36.0.59 × 12 — where does the decimal point go? (a) 0.0708 (b) 0.708 (c) 70.8 (d) 7.08
  37. 37.0.78 × 0.9 — where does the decimal point go? (a) 0.702 (b) 7.02 (c) 0.00702 (d) 0.0702
  38. 38.0.31 × 3 — where does the decimal point go? (a) 0.0093 (b) 0.093 (c) 0.93 (d) 9.3
  39. 39.7.7 × 31 — where does the decimal point go? (a) 2.387 (b) 2387 (c) 238.7 (d) 23.87
  40. 40.0.17 × 5 — where does the decimal point go? (a) 0.0085 (b) 0.85 (c) 0.085 (d) 8.5

Answer key

  1. 48.8
  2. 0.539
  3. 377.2
  4. 36.8
  5. 0.475
  6. 29.82
  7. 0.98
  8. 0.328
  9. 362.6
  10. 6.29
  11. 10.78
  12. 2.88
  13. 0.268
  14. 5.76
  15. 0.378
  16. 23.01
  17. 81.6
  18. 15.75
  19. 21.6
  20. 146.4
  21. 1.12
  22. 25.2
  23. 1.08
  24. 133.5
  25. 62.5
  26. 0.316
  27. 22.2
  28. 3.29
  29. 114.8
  30. 0.63
  31. 2.556
  32. 10.44
  33. 2.56
  34. 6.32
  35. 2.59
  36. 7.08
  37. 0.702
  38. 0.93
  39. 238.7
  40. 0.85

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