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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 327 · 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. 1.9.1 × 27 — where does the decimal point go? (a) 24.57 (b) 2457 (c) 245.7 (d) 2.457
  2. 2.0.62 × 39 — where does the decimal point go? (a) 2.418 (b) 0.2418 (c) 241.8 (d) 24.18
  3. 3.0.56 × 8 — where does the decimal point go? (a) 0.448 (b) 0.0448 (c) 44.8 (d) 4.48
  4. 4.7.7 × 0.3 — where does the decimal point go? (a) 0.0231 (b) 23.1 (c) 2.31 (d) 0.231
  5. 5.7.4 × 47 — where does the decimal point go? (a) 34.78 (b) 3.478 (c) 3478 (d) 347.8
  6. 6.0.88 × 44 — where does the decimal point go? (a) 387.2 (b) 0.3872 (c) 3.872 (d) 38.72
  7. 7.5.1 × 35 — where does the decimal point go? (a) 1.785 (b) 178.5 (c) 17.85 (d) 1785
  8. 8.0.67 × 0.4 — where does the decimal point go? (a) 0.0268 (b) 0.268 (c) 2.68 (d) 0.00268
  9. 9.9.7 × 4 — where does the decimal point go? (a) 388 (b) 38.8 (c) 0.388 (d) 3.88
  10. 10.2.2 × 38 — where does the decimal point go? (a) 0.836 (b) 8.36 (c) 836 (d) 83.6
  11. 11.2.4 × 3.1 — where does the decimal point go? (a) 0.744 (b) 74.4 (c) 7.44 (d) 0.0744
  12. 12.0.43 × 0.6 — where does the decimal point go? (a) 0.00258 (b) 2.58 (c) 0.258 (d) 0.0258
  13. 13.0.59 × 6 — where does the decimal point go? (a) 35.4 (b) 3.54 (c) 0.0354 (d) 0.354
  14. 14.0.91 × 18 — where does the decimal point go? (a) 16.38 (b) 0.1638 (c) 1.638 (d) 163.8
  15. 15.8.2 × 7 — where does the decimal point go? (a) 57.4 (b) 0.574 (c) 574 (d) 5.74
  16. 16.9.1 × 39 — where does the decimal point go? (a) 3.549 (b) 3549 (c) 35.49 (d) 354.9
  17. 17.9.5 × 11 — where does the decimal point go? (a) 104.5 (b) 10.45 (c) 1.045 (d) 1045
  18. 18.0.19 × 42 — where does the decimal point go? (a) 79.8 (b) 0.798 (c) 0.0798 (d) 7.98
  19. 19.1.7 × 9 — where does the decimal point go? (a) 1.53 (b) 153 (c) 0.153 (d) 15.3
  20. 20.0.19 × 23 — where does the decimal point go? (a) 0.0437 (b) 4.37 (c) 0.437 (d) 43.7
  21. 21.7.8 × 4 — where does the decimal point go? (a) 31.2 (b) 3.12 (c) 0.312 (d) 312
  22. 22.0.37 × 1.3 — where does the decimal point go? (a) 0.481 (b) 0.0481 (c) 4.81 (d) 0.00481
  23. 23.9.5 × 0.5 — where does the decimal point go? (a) 0.475 (b) 47.5 (c) 4.75 (d) 0.0475
  24. 24.5.3 × 3 — where does the decimal point go? (a) 1.59 (b) 15.9 (c) 0.159 (d) 159
  25. 25.0.23 × 13 — where does the decimal point go? (a) 0.0299 (b) 2.99 (c) 29.9 (d) 0.299
  26. 26.8.4 × 0.8 — where does the decimal point go? (a) 6.72 (b) 67.2 (c) 0.672 (d) 0.0672
  27. 27.0.48 × 6 — where does the decimal point go? (a) 2.88 (b) 0.288 (c) 28.8 (d) 0.0288
  28. 28.0.84 × 4 — where does the decimal point go? (a) 0.0336 (b) 3.36 (c) 0.336 (d) 33.6
  29. 29.5.6 × 36 — where does the decimal point go? (a) 20.16 (b) 2.016 (c) 2016 (d) 201.6
  30. 30.0.83 × 43 — where does the decimal point go? (a) 3.569 (b) 35.69 (c) 356.9 (d) 0.3569
  31. 31.0.91 × 2.2 — where does the decimal point go? (a) 0.02002 (b) 20.02 (c) 0.2002 (d) 2.002
  32. 32.0.23 × 9 — where does the decimal point go? (a) 0.207 (b) 0.0207 (c) 20.7 (d) 2.07
  33. 33.7.7 × 4 — where does the decimal point go? (a) 3.08 (b) 308 (c) 30.8 (d) 0.308
  34. 34.9.8 × 0.6 — where does the decimal point go? (a) 0.588 (b) 0.0588 (c) 5.88 (d) 58.8
  35. 35.0.58 × 0.7 — where does the decimal point go? (a) 0.406 (b) 4.06 (c) 0.00406 (d) 0.0406
  36. 36.0.81 × 3.3 — where does the decimal point go? (a) 0.2673 (b) 2.673 (c) 0.02673 (d) 26.73
  37. 37.0.44 × 0.9 — where does the decimal point go? (a) 0.396 (b) 3.96 (c) 0.00396 (d) 0.0396
  38. 38.0.45 × 7 — where does the decimal point go? (a) 0.315 (b) 3.15 (c) 31.5 (d) 0.0315
  39. 39.4.6 × 0.2 — where does the decimal point go? (a) 0.092 (b) 0.0092 (c) 0.92 (d) 9.2
  40. 40.0.83 × 0.5 — where does the decimal point go? (a) 4.15 (b) 0.0415 (c) 0.00415 (d) 0.415

Answer key

  1. 245.7
  2. 24.18
  3. 4.48
  4. 2.31
  5. 347.8
  6. 38.72
  7. 178.5
  8. 0.268
  9. 38.8
  10. 83.6
  11. 7.44
  12. 0.258
  13. 3.54
  14. 16.38
  15. 57.4
  16. 354.9
  17. 104.5
  18. 7.98
  19. 15.3
  20. 4.37
  21. 31.2
  22. 0.481
  23. 4.75
  24. 15.9
  25. 2.99
  26. 6.72
  27. 2.88
  28. 3.36
  29. 201.6
  30. 35.69
  31. 2.002
  32. 2.07
  33. 30.8
  34. 5.88
  35. 0.406
  36. 2.673
  37. 0.396
  38. 3.15
  39. 0.92
  40. 0.415

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