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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 585 · 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. 1.8.7 × 2.3 — where does the decimal point go? (a) 2.001 (b) 20.01 (c) 200.1 (d) 0.2001
  2. 2.2.7 × 0.5 — where does the decimal point go? (a) 13.5 (b) 0.0135 (c) 0.135 (d) 1.35
  3. 3.4.8 × 6 — where does the decimal point go? (a) 0.288 (b) 288 (c) 2.88 (d) 28.8
  4. 4.0.37 × 8 — where does the decimal point go? (a) 0.296 (b) 29.6 (c) 2.96 (d) 0.0296
  5. 5.1.2 × 1.8 — where does the decimal point go? (a) 0.216 (b) 21.6 (c) 0.0216 (d) 2.16
  6. 6.3.5 × 45 — where does the decimal point go? (a) 15.75 (b) 157.5 (c) 1.575 (d) 1575
  7. 7.0.69 × 15 — where does the decimal point go? (a) 1.035 (b) 103.5 (c) 10.35 (d) 0.1035
  8. 8.0.17 × 19 — where does the decimal point go? (a) 3.23 (b) 0.323 (c) 0.0323 (d) 32.3
  9. 9.0.33 × 2.1 — where does the decimal point go? (a) 0.00693 (b) 0.693 (c) 0.0693 (d) 6.93
  10. 10.6.8 × 7 — where does the decimal point go? (a) 0.476 (b) 47.6 (c) 4.76 (d) 476
  11. 11.0.62 × 11 — where does the decimal point go? (a) 0.0682 (b) 6.82 (c) 68.2 (d) 0.682
  12. 12.0.57 × 22 — where does the decimal point go? (a) 12.54 (b) 1.254 (c) 0.1254 (d) 125.4
  13. 13.0.95 × 0.3 — where does the decimal point go? (a) 0.285 (b) 0.0285 (c) 2.85 (d) 0.00285
  14. 14.0.73 × 5 — where does the decimal point go? (a) 0.0365 (b) 3.65 (c) 0.365 (d) 36.5
  15. 15.7.3 × 49 — where does the decimal point go? (a) 357.7 (b) 3.577 (c) 3577 (d) 35.77
  16. 16.6.7 × 0.5 — where does the decimal point go? (a) 3.35 (b) 0.0335 (c) 0.335 (d) 33.5
  17. 17.6.4 × 2.3 — where does the decimal point go? (a) 0.1472 (b) 147.2 (c) 1.472 (d) 14.72
  18. 18.8.7 × 0.4 — where does the decimal point go? (a) 0.0348 (b) 0.348 (c) 34.8 (d) 3.48
  19. 19.3.9 × 0.7 — where does the decimal point go? (a) 0.0273 (b) 2.73 (c) 27.3 (d) 0.273
  20. 20.3.6 × 47 — where does the decimal point go? (a) 1.692 (b) 1692 (c) 16.92 (d) 169.2
  21. 21.0.22 × 0.9 — where does the decimal point go? (a) 0.198 (b) 1.98 (c) 0.00198 (d) 0.0198
  22. 22.0.66 × 6 — where does the decimal point go? (a) 0.396 (b) 3.96 (c) 0.0396 (d) 39.6
  23. 23.1.7 × 17 — where does the decimal point go? (a) 2.89 (b) 28.9 (c) 0.289 (d) 289
  24. 24.0.54 × 3.2 — where does the decimal point go? (a) 0.1728 (b) 1.728 (c) 0.01728 (d) 17.28
  25. 25.0.64 × 9 — where does the decimal point go? (a) 5.76 (b) 0.0576 (c) 0.576 (d) 57.6
  26. 26.6.7 × 35 — where does the decimal point go? (a) 2.345 (b) 234.5 (c) 23.45 (d) 2345
  27. 27.7.2 × 33 — where does the decimal point go? (a) 2376 (b) 237.6 (c) 23.76 (d) 2.376
  28. 28.7.5 × 7 — where does the decimal point go? (a) 5.25 (b) 525 (c) 0.525 (d) 52.5
  29. 29.0.46 × 9 — where does the decimal point go? (a) 4.14 (b) 41.4 (c) 0.414 (d) 0.0414
  30. 30.4.7 × 2.2 — where does the decimal point go? (a) 0.1034 (b) 103.4 (c) 1.034 (d) 10.34
  31. 31.7.3 × 0.5 — where does the decimal point go? (a) 36.5 (b) 0.365 (c) 0.0365 (d) 3.65
  32. 32.0.42 × 43 — where does the decimal point go? (a) 1.806 (b) 180.6 (c) 18.06 (d) 0.1806
  33. 33.0.87 × 0.6 — where does the decimal point go? (a) 5.22 (b) 0.0522 (c) 0.00522 (d) 0.522
  34. 34.0.98 × 3.1 — where does the decimal point go? (a) 3.038 (b) 0.3038 (c) 0.03038 (d) 30.38
  35. 35.0.97 × 16 — where does the decimal point go? (a) 0.1552 (b) 15.52 (c) 1.552 (d) 155.2
  36. 36.0.93 × 0.9 — where does the decimal point go? (a) 0.00837 (b) 0.837 (c) 0.0837 (d) 8.37
  37. 37.0.12 × 4 — where does the decimal point go? (a) 0.0048 (b) 0.048 (c) 0.48 (d) 4.8
  38. 38.7.9 × 5 — where does the decimal point go? (a) 395 (b) 39.5 (c) 3.95 (d) 0.395
  39. 39.0.31 × 4.6 — where does the decimal point go? (a) 0.1426 (b) 14.26 (c) 0.01426 (d) 1.426
  40. 40.0.98 × 41 — where does the decimal point go? (a) 401.8 (b) 0.4018 (c) 4.018 (d) 40.18

Answer key

  1. 20.01
  2. 1.35
  3. 28.8
  4. 2.96
  5. 2.16
  6. 157.5
  7. 10.35
  8. 3.23
  9. 0.693
  10. 47.6
  11. 6.82
  12. 12.54
  13. 0.285
  14. 3.65
  15. 357.7
  16. 3.35
  17. 14.72
  18. 3.48
  19. 2.73
  20. 169.2
  21. 0.198
  22. 3.96
  23. 28.9
  24. 1.728
  25. 5.76
  26. 234.5
  27. 237.6
  28. 52.5
  29. 4.14
  30. 10.34
  31. 3.65
  32. 18.06
  33. 0.522
  34. 3.038
  35. 15.52
  36. 0.837
  37. 0.48
  38. 39.5
  39. 1.426
  40. 40.18

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