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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 329 · 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. 1.0.43 × 4.7 — where does the decimal point go? (a) 0.2021 (b) 0.02021 (c) 20.21 (d) 2.021
  2. 2.3.7 × 3 — where does the decimal point go? (a) 0.111 (b) 1.11 (c) 111 (d) 11.1
  3. 3.5.8 × 6 — where does the decimal point go? (a) 348 (b) 3.48 (c) 34.8 (d) 0.348
  4. 4.7.6 × 4 — where does the decimal point go? (a) 304 (b) 3.04 (c) 0.304 (d) 30.4
  5. 5.0.28 × 14 — where does the decimal point go? (a) 39.2 (b) 3.92 (c) 0.0392 (d) 0.392
  6. 6.0.99 × 6 — where does the decimal point go? (a) 5.94 (b) 0.0594 (c) 0.594 (d) 59.4
  7. 7.1.7 × 5 — where does the decimal point go? (a) 0.85 (b) 85 (c) 8.5 (d) 0.085
  8. 8.0.67 × 21 — where does the decimal point go? (a) 0.1407 (b) 140.7 (c) 14.07 (d) 1.407
  9. 9.2.4 × 2 — where does the decimal point go? (a) 48 (b) 0.48 (c) 4.8 (d) 0.048
  10. 10.0.93 × 7 — where does the decimal point go? (a) 0.651 (b) 65.1 (c) 6.51 (d) 0.0651
  11. 11.6.4 × 0.4 — where does the decimal point go? (a) 0.256 (b) 2.56 (c) 25.6 (d) 0.0256
  12. 12.7.1 × 39 — where does the decimal point go? (a) 2.769 (b) 2769 (c) 27.69 (d) 276.9
  13. 13.0.51 × 4.1 — where does the decimal point go? (a) 2.091 (b) 0.02091 (c) 20.91 (d) 0.2091
  14. 14.1.5 × 3.7 — where does the decimal point go? (a) 5.55 (b) 0.0555 (c) 0.555 (d) 55.5
  15. 15.0.21 × 22 — where does the decimal point go? (a) 4.62 (b) 46.2 (c) 0.0462 (d) 0.462
  16. 16.7.2 × 2.6 — where does the decimal point go? (a) 1.872 (b) 18.72 (c) 0.1872 (d) 187.2
  17. 17.5.1 × 49 — where does the decimal point go? (a) 249.9 (b) 24.99 (c) 2499 (d) 2.499
  18. 18.0.34 × 0.2 — where does the decimal point go? (a) 0.68 (b) 0.00068 (c) 0.0068 (d) 0.068
  19. 19.0.91 × 41 — where does the decimal point go? (a) 3.731 (b) 373.1 (c) 0.3731 (d) 37.31
  20. 20.0.24 × 3 — where does the decimal point go? (a) 7.2 (b) 0.72 (c) 0.072 (d) 0.0072
  21. 21.0.81 × 12 — where does the decimal point go? (a) 97.2 (b) 0.972 (c) 0.0972 (d) 9.72
  22. 22.8.1 × 34 — where does the decimal point go? (a) 2754 (b) 2.754 (c) 27.54 (d) 275.4
  23. 23.5.6 × 37 — where does the decimal point go? (a) 20.72 (b) 2.072 (c) 207.2 (d) 2072
  24. 24.0.92 × 8 — where does the decimal point go? (a) 0.736 (b) 0.0736 (c) 73.6 (d) 7.36
  25. 25.1.4 × 0.6 — where does the decimal point go? (a) 0.0084 (b) 0.84 (c) 8.4 (d) 0.084
  26. 26.0.43 × 1.2 — where does the decimal point go? (a) 0.516 (b) 0.00516 (c) 0.0516 (d) 5.16
  27. 27.1.8 × 2 — where does the decimal point go? (a) 36 (b) 0.36 (c) 3.6 (d) 0.036
  28. 28.0.86 × 0.8 — where does the decimal point go? (a) 6.88 (b) 0.688 (c) 0.0688 (d) 0.00688
  29. 29.0.19 × 0.2 — where does the decimal point go? (a) 0.38 (b) 0.0038 (c) 0.00038 (d) 0.038
  30. 30.0.67 × 29 — where does the decimal point go? (a) 19.43 (b) 1.943 (c) 194.3 (d) 0.1943
  31. 31.0.49 × 0.8 — where does the decimal point go? (a) 3.92 (b) 0.0392 (c) 0.392 (d) 0.00392
  32. 32.4.6 × 2 — where does the decimal point go? (a) 0.92 (b) 9.2 (c) 92 (d) 0.092
  33. 33.0.43 × 0.9 — where does the decimal point go? (a) 0.00387 (b) 0.387 (c) 3.87 (d) 0.0387
  34. 34.0.46 × 8 — where does the decimal point go? (a) 0.0368 (b) 0.368 (c) 3.68 (d) 36.8
  35. 35.9.5 × 0.5 — where does the decimal point go? (a) 0.475 (b) 0.0475 (c) 4.75 (d) 47.5
  36. 36.0.46 × 0.2 — where does the decimal point go? (a) 0.92 (b) 0.00092 (c) 0.092 (d) 0.0092
  37. 37.5.3 × 4 — where does the decimal point go? (a) 2.12 (b) 212 (c) 0.212 (d) 21.2
  38. 38.0.21 × 0.9 — where does the decimal point go? (a) 1.89 (b) 0.0189 (c) 0.00189 (d) 0.189
  39. 39.0.92 × 0.9 — where does the decimal point go? (a) 0.00828 (b) 8.28 (c) 0.0828 (d) 0.828
  40. 40.5.9 × 0.3 — where does the decimal point go? (a) 1.77 (b) 0.177 (c) 17.7 (d) 0.0177

Answer key

  1. 2.021
  2. 11.1
  3. 34.8
  4. 30.4
  5. 3.92
  6. 5.94
  7. 8.5
  8. 14.07
  9. 4.8
  10. 6.51
  11. 2.56
  12. 276.9
  13. 2.091
  14. 5.55
  15. 4.62
  16. 18.72
  17. 249.9
  18. 0.068
  19. 37.31
  20. 0.72
  21. 9.72
  22. 275.4
  23. 207.2
  24. 7.36
  25. 0.84
  26. 0.516
  27. 3.6
  28. 0.688
  29. 0.038
  30. 19.43
  31. 0.392
  32. 9.2
  33. 0.387
  34. 3.68
  35. 4.75
  36. 0.092
  37. 21.2
  38. 0.189
  39. 0.828
  40. 1.77

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