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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 911 · 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. 1.7.7 × 13 — where does the decimal point go? (a) 1.001 (b) 10.01 (c) 100.1 (d) 1001
  2. 2.0.63 × 0.3 — where does the decimal point go? (a) 0.0189 (b) 0.189 (c) 0.00189 (d) 1.89
  3. 3.0.52 × 36 — where does the decimal point go? (a) 187.2 (b) 1.872 (c) 0.1872 (d) 18.72
  4. 4.7.3 × 4 — where does the decimal point go? (a) 29.2 (b) 2.92 (c) 292 (d) 0.292
  5. 5.0.37 × 9 — where does the decimal point go? (a) 0.333 (b) 0.0333 (c) 33.3 (d) 3.33
  6. 6.0.24 × 3 — where does the decimal point go? (a) 0.072 (b) 7.2 (c) 0.0072 (d) 0.72
  7. 7.4.9 × 21 — where does the decimal point go? (a) 1029 (b) 1.029 (c) 10.29 (d) 102.9
  8. 8.7.4 × 8 — where does the decimal point go? (a) 592 (b) 5.92 (c) 59.2 (d) 0.592
  9. 9.8.8 × 2.2 — where does the decimal point go? (a) 0.1936 (b) 1.936 (c) 19.36 (d) 193.6
  10. 10.3.8 × 19 — where does the decimal point go? (a) 7.22 (b) 722 (c) 72.2 (d) 0.722
  11. 11.0.16 × 28 — where does the decimal point go? (a) 0.0448 (b) 0.448 (c) 4.48 (d) 44.8
  12. 12.8.8 × 0.9 — where does the decimal point go? (a) 79.2 (b) 0.792 (c) 7.92 (d) 0.0792
  13. 13.1.5 × 0.3 — where does the decimal point go? (a) 0.0045 (b) 4.5 (c) 0.45 (d) 0.045
  14. 14.6.4 × 17 — where does the decimal point go? (a) 10.88 (b) 1.088 (c) 1088 (d) 108.8
  15. 15.0.13 × 2.4 — where does the decimal point go? (a) 0.0312 (b) 0.312 (c) 0.00312 (d) 3.12
  16. 16.0.15 × 13 — where does the decimal point go? (a) 1.95 (b) 0.0195 (c) 0.195 (d) 19.5
  17. 17.0.62 × 42 — where does the decimal point go? (a) 0.2604 (b) 260.4 (c) 2.604 (d) 26.04
  18. 18.0.13 × 36 — where does the decimal point go? (a) 4.68 (b) 0.0468 (c) 46.8 (d) 0.468
  19. 19.8.2 × 7 — where does the decimal point go? (a) 57.4 (b) 574 (c) 0.574 (d) 5.74
  20. 20.8.6 × 0.2 — where does the decimal point go? (a) 17.2 (b) 0.172 (c) 0.0172 (d) 1.72
  21. 21.0.73 × 4.7 — where does the decimal point go? (a) 0.3431 (b) 3.431 (c) 0.03431 (d) 34.31
  22. 22.5.4 × 16 — where does the decimal point go? (a) 864 (b) 86.4 (c) 0.864 (d) 8.64
  23. 23.0.97 × 3 — where does the decimal point go? (a) 0.0291 (b) 0.291 (c) 2.91 (d) 29.1
  24. 24.4.3 × 0.5 — where does the decimal point go? (a) 0.0215 (b) 21.5 (c) 0.215 (d) 2.15
  25. 25.9.5 × 0.9 — where does the decimal point go? (a) 8.55 (b) 0.0855 (c) 0.855 (d) 85.5
  26. 26.0.88 × 0.6 — where does the decimal point go? (a) 5.28 (b) 0.00528 (c) 0.0528 (d) 0.528
  27. 27.2.9 × 4.5 — where does the decimal point go? (a) 0.1305 (b) 130.5 (c) 1.305 (d) 13.05
  28. 28.4.1 × 2 — where does the decimal point go? (a) 0.082 (b) 0.82 (c) 82 (d) 8.2
  29. 29.0.79 × 46 — where does the decimal point go? (a) 36.34 (b) 0.3634 (c) 3.634 (d) 363.4
  30. 30.0.33 × 2.3 — where does the decimal point go? (a) 0.759 (b) 0.00759 (c) 0.0759 (d) 7.59
  31. 31.6.7 × 8 — where does the decimal point go? (a) 53.6 (b) 5.36 (c) 0.536 (d) 536
  32. 32.4.7 × 0.3 — where does the decimal point go? (a) 1.41 (b) 0.141 (c) 0.0141 (d) 14.1
  33. 33.0.46 × 0.9 — where does the decimal point go? (a) 0.0414 (b) 0.414 (c) 0.00414 (d) 4.14
  34. 34.4.1 × 0.8 — where does the decimal point go? (a) 3.28 (b) 0.328 (c) 32.8 (d) 0.0328
  35. 35.0.49 × 0.5 — where does the decimal point go? (a) 0.0245 (b) 0.00245 (c) 2.45 (d) 0.245
  36. 36.0.47 × 0.3 — where does the decimal point go? (a) 1.41 (b) 0.141 (c) 0.00141 (d) 0.0141
  37. 37.2.8 × 0.4 — where does the decimal point go? (a) 1.12 (b) 0.0112 (c) 0.112 (d) 11.2
  38. 38.3.2 × 2.7 — where does the decimal point go? (a) 0.864 (b) 86.4 (c) 8.64 (d) 0.0864
  39. 39.4.3 × 2.6 — where does the decimal point go? (a) 0.1118 (b) 1.118 (c) 111.8 (d) 11.18
  40. 40.7.2 × 7 — where does the decimal point go? (a) 504 (b) 50.4 (c) 0.504 (d) 5.04

Answer key

  1. 100.1
  2. 0.189
  3. 18.72
  4. 29.2
  5. 3.33
  6. 0.72
  7. 102.9
  8. 59.2
  9. 19.36
  10. 72.2
  11. 4.48
  12. 7.92
  13. 0.45
  14. 108.8
  15. 0.312
  16. 1.95
  17. 26.04
  18. 4.68
  19. 57.4
  20. 1.72
  21. 3.431
  22. 86.4
  23. 2.91
  24. 2.15
  25. 8.55
  26. 0.528
  27. 13.05
  28. 8.2
  29. 36.34
  30. 0.759
  31. 53.6
  32. 1.41
  33. 0.414
  34. 3.28
  35. 0.245
  36. 0.141
  37. 1.12
  38. 8.64
  39. 11.18
  40. 50.4

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