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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 280 · 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. 1.0.52 × 48 — where does the decimal point go? (a) 24.96 (b) 249.6 (c) 0.2496 (d) 2.496
  2. 2.0.77 × 0.5 — where does the decimal point go? (a) 0.00385 (b) 3.85 (c) 0.0385 (d) 0.385
  3. 3.0.61 × 2 — where does the decimal point go? (a) 0.0122 (b) 12.2 (c) 1.22 (d) 0.122
  4. 4.0.83 × 31 — where does the decimal point go? (a) 25.73 (b) 2.573 (c) 257.3 (d) 0.2573
  5. 5.5.7 × 0.8 — where does the decimal point go? (a) 0.0456 (b) 0.456 (c) 45.6 (d) 4.56
  6. 6.0.39 × 0.9 — where does the decimal point go? (a) 0.0351 (b) 3.51 (c) 0.351 (d) 0.00351
  7. 7.4.7 × 2.2 — where does the decimal point go? (a) 103.4 (b) 0.1034 (c) 10.34 (d) 1.034
  8. 8.9.1 × 0.2 — where does the decimal point go? (a) 18.2 (b) 0.182 (c) 0.0182 (d) 1.82
  9. 9.2.6 × 41 — where does the decimal point go? (a) 1066 (b) 106.6 (c) 1.066 (d) 10.66
  10. 10.7.9 × 2.1 — where does the decimal point go? (a) 0.1659 (b) 1.659 (c) 165.9 (d) 16.59
  11. 11.0.32 × 2 — where does the decimal point go? (a) 6.4 (b) 0.0064 (c) 0.64 (d) 0.064
  12. 12.3.4 × 0.9 — where does the decimal point go? (a) 0.0306 (b) 0.306 (c) 30.6 (d) 3.06
  13. 13.7.2 × 0.8 — where does the decimal point go? (a) 5.76 (b) 0.0576 (c) 0.576 (d) 57.6
  14. 14.8.4 × 8 — where does the decimal point go? (a) 0.672 (b) 67.2 (c) 6.72 (d) 672
  15. 15.7.1 × 2.6 — where does the decimal point go? (a) 1.846 (b) 0.1846 (c) 18.46 (d) 184.6
  16. 16.8.2 × 1.7 — where does the decimal point go? (a) 0.1394 (b) 13.94 (c) 1.394 (d) 139.4
  17. 17.0.99 × 41 — where does the decimal point go? (a) 4.059 (b) 40.59 (c) 405.9 (d) 0.4059
  18. 18.0.16 × 2 — where does the decimal point go? (a) 0.32 (b) 0.032 (c) 0.0032 (d) 3.2
  19. 19.0.43 × 1.7 — where does the decimal point go? (a) 0.00731 (b) 7.31 (c) 0.731 (d) 0.0731
  20. 20.3.3 × 4 — where does the decimal point go? (a) 0.132 (b) 1.32 (c) 13.2 (d) 132
  21. 21.1.5 × 0.3 — where does the decimal point go? (a) 0.45 (b) 0.045 (c) 0.0045 (d) 4.5
  22. 22.0.12 × 7 — where does the decimal point go? (a) 0.084 (b) 0.0084 (c) 0.84 (d) 8.4
  23. 23.0.38 × 8 — where does the decimal point go? (a) 30.4 (b) 3.04 (c) 0.304 (d) 0.0304
  24. 24.0.59 × 16 — where does the decimal point go? (a) 9.44 (b) 0.0944 (c) 0.944 (d) 94.4
  25. 25.0.56 × 9 — where does the decimal point go? (a) 50.4 (b) 0.0504 (c) 5.04 (d) 0.504
  26. 26.0.79 × 1.8 — where does the decimal point go? (a) 1.422 (b) 14.22 (c) 0.1422 (d) 0.01422
  27. 27.1.6 × 4.3 — where does the decimal point go? (a) 0.0688 (b) 6.88 (c) 0.688 (d) 68.8
  28. 28.0.67 × 3 — where does the decimal point go? (a) 0.201 (b) 0.0201 (c) 20.1 (d) 2.01
  29. 29.4.9 × 36 — where does the decimal point go? (a) 1764 (b) 1.764 (c) 176.4 (d) 17.64
  30. 30.3.7 × 3 — where does the decimal point go? (a) 0.111 (b) 1.11 (c) 11.1 (d) 111
  31. 31.9.6 × 0.7 — where does the decimal point go? (a) 0.0672 (b) 0.672 (c) 67.2 (d) 6.72
  32. 32.4.8 × 41 — where does the decimal point go? (a) 1.968 (b) 1968 (c) 19.68 (d) 196.8
  33. 33.0.32 × 2.9 — where does the decimal point go? (a) 0.0928 (b) 0.928 (c) 9.28 (d) 0.00928
  34. 34.7.4 × 0.8 — where does the decimal point go? (a) 59.2 (b) 5.92 (c) 0.592 (d) 0.0592
  35. 35.1.9 × 11 — where does the decimal point go? (a) 209 (b) 0.209 (c) 2.09 (d) 20.9
  36. 36.1.4 × 33 — where does the decimal point go? (a) 4.62 (b) 0.462 (c) 46.2 (d) 462
  37. 37.2.1 × 9 — where does the decimal point go? (a) 0.189 (b) 18.9 (c) 1.89 (d) 189
  38. 38.4.9 × 2 — where does the decimal point go? (a) 9.8 (b) 0.098 (c) 0.98 (d) 98
  39. 39.6.2 × 0.2 — where does the decimal point go? (a) 0.124 (b) 1.24 (c) 0.0124 (d) 12.4
  40. 40.0.51 × 4.2 — where does the decimal point go? (a) 0.02142 (b) 21.42 (c) 2.142 (d) 0.2142

Answer key

  1. 24.96
  2. 0.385
  3. 1.22
  4. 25.73
  5. 4.56
  6. 0.351
  7. 10.34
  8. 1.82
  9. 106.6
  10. 16.59
  11. 0.64
  12. 3.06
  13. 5.76
  14. 67.2
  15. 18.46
  16. 13.94
  17. 40.59
  18. 0.32
  19. 0.731
  20. 13.2
  21. 0.45
  22. 0.84
  23. 3.04
  24. 9.44
  25. 5.04
  26. 1.422
  27. 6.88
  28. 2.01
  29. 176.4
  30. 11.1
  31. 6.72
  32. 196.8
  33. 0.928
  34. 5.92
  35. 20.9
  36. 46.2
  37. 18.9
  38. 9.8
  39. 1.24
  40. 2.142

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