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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 914 · 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. 1.0.57 × 2.4 — where does the decimal point go? (a) 0.01368 (b) 1.368 (c) 0.1368 (d) 13.68
  2. 2.4.9 × 42 — where does the decimal point go? (a) 205.8 (b) 2058 (c) 20.58 (d) 2.058
  3. 3.5.5 × 0.7 — where does the decimal point go? (a) 0.385 (b) 38.5 (c) 0.0385 (d) 3.85
  4. 4.1.8 × 8 — where does the decimal point go? (a) 1.44 (b) 144 (c) 14.4 (d) 0.144
  5. 5.0.39 × 0.8 — where does the decimal point go? (a) 3.12 (b) 0.0312 (c) 0.00312 (d) 0.312
  6. 6.6.1 × 0.9 — where does the decimal point go? (a) 5.49 (b) 0.549 (c) 54.9 (d) 0.0549
  7. 7.0.41 × 0.6 — where does the decimal point go? (a) 0.0246 (b) 0.246 (c) 2.46 (d) 0.00246
  8. 8.8.3 × 43 — where does the decimal point go? (a) 356.9 (b) 3569 (c) 35.69 (d) 3.569
  9. 9.0.22 × 3 — where does the decimal point go? (a) 0.0066 (b) 0.066 (c) 6.6 (d) 0.66
  10. 10.0.62 × 0.8 — where does the decimal point go? (a) 0.0496 (b) 4.96 (c) 0.496 (d) 0.00496
  11. 11.4.7 × 5 — where does the decimal point go? (a) 235 (b) 2.35 (c) 23.5 (d) 0.235
  12. 12.6.2 × 18 — where does the decimal point go? (a) 1116 (b) 111.6 (c) 1.116 (d) 11.16
  13. 13.1.7 × 47 — where does the decimal point go? (a) 799 (b) 7.99 (c) 0.799 (d) 79.9
  14. 14.4.4 × 7 — where does the decimal point go? (a) 30.8 (b) 3.08 (c) 0.308 (d) 308
  15. 15.0.83 × 0.5 — where does the decimal point go? (a) 0.0415 (b) 0.00415 (c) 0.415 (d) 4.15
  16. 16.3.7 × 2.7 — where does the decimal point go? (a) 0.999 (b) 9.99 (c) 0.0999 (d) 99.9
  17. 17.0.76 × 3.4 — where does the decimal point go? (a) 25.84 (b) 2.584 (c) 0.02584 (d) 0.2584
  18. 18.3.9 × 0.6 — where does the decimal point go? (a) 23.4 (b) 0.234 (c) 0.0234 (d) 2.34
  19. 19.0.99 × 18 — where does the decimal point go? (a) 1.782 (b) 178.2 (c) 17.82 (d) 0.1782
  20. 20.7.4 × 2.3 — where does the decimal point go? (a) 1.702 (b) 17.02 (c) 0.1702 (d) 170.2
  21. 21.2.5 × 11 — where does the decimal point go? (a) 275 (b) 0.275 (c) 2.75 (d) 27.5
  22. 22.3.2 × 0.9 — where does the decimal point go? (a) 28.8 (b) 0.0288 (c) 0.288 (d) 2.88
  23. 23.0.47 × 0.3 — where does the decimal point go? (a) 0.0141 (b) 0.00141 (c) 0.141 (d) 1.41
  24. 24.8.9 × 4 — where does the decimal point go? (a) 0.356 (b) 3.56 (c) 356 (d) 35.6
  25. 25.2.9 × 2 — where does the decimal point go? (a) 0.058 (b) 58 (c) 5.8 (d) 0.58
  26. 26.4.8 × 2.3 — where does the decimal point go? (a) 110.4 (b) 1.104 (c) 0.1104 (d) 11.04
  27. 27.0.46 × 2 — where does the decimal point go? (a) 0.0092 (b) 9.2 (c) 0.92 (d) 0.092
  28. 28.5.9 × 16 — where does the decimal point go? (a) 9.44 (b) 0.944 (c) 944 (d) 94.4
  29. 29.2.4 × 1.3 — where does the decimal point go? (a) 0.0312 (b) 0.312 (c) 31.2 (d) 3.12
  30. 30.2.1 × 5 — where does the decimal point go? (a) 105 (b) 10.5 (c) 0.105 (d) 1.05
  31. 31.7.3 × 25 — where does the decimal point go? (a) 18.25 (b) 182.5 (c) 1.825 (d) 1825
  32. 32.0.13 × 45 — where does the decimal point go? (a) 5.85 (b) 0.585 (c) 0.0585 (d) 58.5
  33. 33.2.5 × 3 — where does the decimal point go? (a) 0.75 (b) 0.075 (c) 7.5 (d) 75
  34. 34.0.96 × 3 — where does the decimal point go? (a) 0.0288 (b) 2.88 (c) 28.8 (d) 0.288
  35. 35.5.9 × 0.3 — where does the decimal point go? (a) 1.77 (b) 0.177 (c) 17.7 (d) 0.0177
  36. 36.6.8 × 0.4 — where does the decimal point go? (a) 0.0272 (b) 0.272 (c) 2.72 (d) 27.2
  37. 37.1.9 × 15 — where does the decimal point go? (a) 28.5 (b) 0.285 (c) 285 (d) 2.85
  38. 38.0.79 × 5 — where does the decimal point go? (a) 39.5 (b) 0.0395 (c) 3.95 (d) 0.395
  39. 39.9.8 × 8 — where does the decimal point go? (a) 0.784 (b) 78.4 (c) 784 (d) 7.84
  40. 40.0.95 × 0.5 — where does the decimal point go? (a) 0.00475 (b) 4.75 (c) 0.475 (d) 0.0475

Answer key

  1. 1.368
  2. 205.8
  3. 3.85
  4. 14.4
  5. 0.312
  6. 5.49
  7. 0.246
  8. 356.9
  9. 0.66
  10. 0.496
  11. 23.5
  12. 111.6
  13. 79.9
  14. 30.8
  15. 0.415
  16. 9.99
  17. 2.584
  18. 2.34
  19. 17.82
  20. 17.02
  21. 27.5
  22. 2.88
  23. 0.141
  24. 35.6
  25. 5.8
  26. 11.04
  27. 0.92
  28. 94.4
  29. 3.12
  30. 10.5
  31. 182.5
  32. 5.85
  33. 7.5
  34. 2.88
  35. 1.77
  36. 2.72
  37. 28.5
  38. 3.95
  39. 78.4
  40. 0.475

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