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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 97 · 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. 1.6.6 × 3 — where does the decimal point go? (a) 0.198 (b) 1.98 (c) 19.8 (d) 198
  2. 2.0.12 × 0.4 — where does the decimal point go? (a) 0.00048 (b) 0.48 (c) 0.0048 (d) 0.048
  3. 3.6.2 × 6 — where does the decimal point go? (a) 3.72 (b) 37.2 (c) 372 (d) 0.372
  4. 4.0.48 × 47 — where does the decimal point go? (a) 2.256 (b) 22.56 (c) 0.2256 (d) 225.6
  5. 5.1.8 × 26 — where does the decimal point go? (a) 468 (b) 4.68 (c) 0.468 (d) 46.8
  6. 6.8.7 × 27 — where does the decimal point go? (a) 2.349 (b) 234.9 (c) 2349 (d) 23.49
  7. 7.0.14 × 0.6 — where does the decimal point go? (a) 0.00084 (b) 0.084 (c) 0.0084 (d) 0.84
  8. 8.7.8 × 0.4 — where does the decimal point go? (a) 0.312 (b) 31.2 (c) 0.0312 (d) 3.12
  9. 9.9.8 × 0.3 — where does the decimal point go? (a) 0.294 (b) 29.4 (c) 2.94 (d) 0.0294
  10. 10.1.6 × 3.2 — where does the decimal point go? (a) 0.512 (b) 51.2 (c) 5.12 (d) 0.0512
  11. 11.0.34 × 6 — where does the decimal point go? (a) 2.04 (b) 0.0204 (c) 0.204 (d) 20.4
  12. 12.9.3 × 0.6 — where does the decimal point go? (a) 0.558 (b) 55.8 (c) 0.0558 (d) 5.58
  13. 13.0.48 × 18 — where does the decimal point go? (a) 0.0864 (b) 8.64 (c) 86.4 (d) 0.864
  14. 14.5.2 × 26 — where does the decimal point go? (a) 1352 (b) 1.352 (c) 135.2 (d) 13.52
  15. 15.0.42 × 4 — where does the decimal point go? (a) 0.0168 (b) 1.68 (c) 0.168 (d) 16.8
  16. 16.0.97 × 0.9 — where does the decimal point go? (a) 8.73 (b) 0.00873 (c) 0.0873 (d) 0.873
  17. 17.0.65 × 11 — where does the decimal point go? (a) 71.5 (b) 0.0715 (c) 0.715 (d) 7.15
  18. 18.1.5 × 31 — where does the decimal point go? (a) 46.5 (b) 0.465 (c) 4.65 (d) 465
  19. 19.4.7 × 0.8 — where does the decimal point go? (a) 37.6 (b) 3.76 (c) 0.0376 (d) 0.376
  20. 20.0.63 × 38 — where does the decimal point go? (a) 0.2394 (b) 2.394 (c) 23.94 (d) 239.4
  21. 21.0.23 × 4.2 — where does the decimal point go? (a) 9.66 (b) 0.0966 (c) 0.966 (d) 0.00966
  22. 22.3.9 × 4 — where does the decimal point go? (a) 156 (b) 0.156 (c) 15.6 (d) 1.56
  23. 23.2.1 × 18 — where does the decimal point go? (a) 378 (b) 3.78 (c) 37.8 (d) 0.378
  24. 24.5.8 × 2 — where does the decimal point go? (a) 1.16 (b) 116 (c) 11.6 (d) 0.116
  25. 25.0.43 × 4.2 — where does the decimal point go? (a) 0.1806 (b) 1.806 (c) 18.06 (d) 0.01806
  26. 26.1.3 × 2 — where does the decimal point go? (a) 0.26 (b) 0.026 (c) 26 (d) 2.6
  27. 27.8.5 × 7 — where does the decimal point go? (a) 595 (b) 59.5 (c) 5.95 (d) 0.595
  28. 28.3.6 × 0.7 — where does the decimal point go? (a) 2.52 (b) 25.2 (c) 0.252 (d) 0.0252
  29. 29.4.1 × 8 — where does the decimal point go? (a) 328 (b) 3.28 (c) 0.328 (d) 32.8
  30. 30.0.37 × 3 — where does the decimal point go? (a) 11.1 (b) 0.111 (c) 1.11 (d) 0.0111
  31. 31.5.3 × 1.5 — where does the decimal point go? (a) 7.95 (b) 0.0795 (c) 79.5 (d) 0.795
  32. 32.5.4 × 9 — where does the decimal point go? (a) 4.86 (b) 0.486 (c) 486 (d) 48.6
  33. 33.0.79 × 16 — where does the decimal point go? (a) 12.64 (b) 126.4 (c) 0.1264 (d) 1.264
  34. 34.0.68 × 23 — where does the decimal point go? (a) 15.64 (b) 156.4 (c) 1.564 (d) 0.1564
  35. 35.3.7 × 2.2 — where does the decimal point go? (a) 8.14 (b) 0.0814 (c) 0.814 (d) 81.4
  36. 36.3.4 × 7 — where does the decimal point go? (a) 2.38 (b) 0.238 (c) 238 (d) 23.8
  37. 37.0.18 × 1.8 — where does the decimal point go? (a) 0.324 (b) 3.24 (c) 0.00324 (d) 0.0324
  38. 38.2.8 × 0.9 — where does the decimal point go? (a) 2.52 (b) 0.0252 (c) 0.252 (d) 25.2
  39. 39.7.8 × 7 — where does the decimal point go? (a) 54.6 (b) 546 (c) 5.46 (d) 0.546
  40. 40.0.92 × 3.2 — where does the decimal point go? (a) 29.44 (b) 0.02944 (c) 2.944 (d) 0.2944

Answer key

  1. 19.8
  2. 0.048
  3. 37.2
  4. 22.56
  5. 46.8
  6. 234.9
  7. 0.084
  8. 3.12
  9. 2.94
  10. 5.12
  11. 2.04
  12. 5.58
  13. 8.64
  14. 135.2
  15. 1.68
  16. 0.873
  17. 7.15
  18. 46.5
  19. 3.76
  20. 23.94
  21. 0.966
  22. 15.6
  23. 37.8
  24. 11.6
  25. 1.806
  26. 2.6
  27. 59.5
  28. 2.52
  29. 32.8
  30. 1.11
  31. 7.95
  32. 48.6
  33. 12.64
  34. 15.64
  35. 8.14
  36. 23.8
  37. 0.324
  38. 2.52
  39. 54.6
  40. 2.944

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