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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 398 · 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. 1.0.13 × 0.5 — where does the decimal point go? (a) 0.0065 (b) 0.00065 (c) 0.65 (d) 0.065
  2. 2.6.5 × 25 — where does the decimal point go? (a) 1.625 (b) 1625 (c) 162.5 (d) 16.25
  3. 3.4.5 × 0.7 — where does the decimal point go? (a) 0.315 (b) 0.0315 (c) 31.5 (d) 3.15
  4. 4.1.6 × 0.2 — where does the decimal point go? (a) 0.32 (b) 0.0032 (c) 3.2 (d) 0.032
  5. 5.2.4 × 6 — where does the decimal point go? (a) 0.144 (b) 1.44 (c) 144 (d) 14.4
  6. 6.2.7 × 36 — where does the decimal point go? (a) 0.972 (b) 972 (c) 9.72 (d) 97.2
  7. 7.1.6 × 16 — where does the decimal point go? (a) 25.6 (b) 0.256 (c) 256 (d) 2.56
  8. 8.9.3 × 5 — where does the decimal point go? (a) 0.465 (b) 46.5 (c) 4.65 (d) 465
  9. 9.5.9 × 2 — where does the decimal point go? (a) 11.8 (b) 1.18 (c) 0.118 (d) 118
  10. 10.4.9 × 1.1 — where does the decimal point go? (a) 0.539 (b) 0.0539 (c) 53.9 (d) 5.39
  11. 11.1.6 × 2.9 — where does the decimal point go? (a) 0.0464 (b) 4.64 (c) 46.4 (d) 0.464
  12. 12.0.47 × 29 — where does the decimal point go? (a) 1.363 (b) 136.3 (c) 13.63 (d) 0.1363
  13. 13.0.18 × 3 — where does the decimal point go? (a) 0.054 (b) 0.54 (c) 0.0054 (d) 5.4
  14. 14.5.9 × 0.9 — where does the decimal point go? (a) 0.531 (b) 0.0531 (c) 53.1 (d) 5.31
  15. 15.2.1 × 38 — where does the decimal point go? (a) 798 (b) 0.798 (c) 79.8 (d) 7.98
  16. 16.1.3 × 0.2 — where does the decimal point go? (a) 0.26 (b) 2.6 (c) 0.0026 (d) 0.026
  17. 17.3.9 × 0.5 — where does the decimal point go? (a) 0.0195 (b) 1.95 (c) 0.195 (d) 19.5
  18. 18.2.8 × 39 — where does the decimal point go? (a) 1.092 (b) 1092 (c) 10.92 (d) 109.2
  19. 19.1.2 × 0.4 — where does the decimal point go? (a) 0.0048 (b) 4.8 (c) 0.048 (d) 0.48
  20. 20.8.1 × 15 — where does the decimal point go? (a) 1.215 (b) 12.15 (c) 121.5 (d) 1215
  21. 21.0.64 × 2.1 — where does the decimal point go? (a) 0.01344 (b) 0.1344 (c) 13.44 (d) 1.344
  22. 22.0.42 × 0.4 — where does the decimal point go? (a) 0.0168 (b) 0.168 (c) 0.00168 (d) 1.68
  23. 23.0.86 × 0.7 — where does the decimal point go? (a) 6.02 (b) 0.0602 (c) 0.00602 (d) 0.602
  24. 24.5.7 × 0.5 — where does the decimal point go? (a) 28.5 (b) 2.85 (c) 0.285 (d) 0.0285
  25. 25.5.8 × 14 — where does the decimal point go? (a) 0.812 (b) 812 (c) 81.2 (d) 8.12
  26. 26.2.6 × 8 — where does the decimal point go? (a) 0.208 (b) 2.08 (c) 20.8 (d) 208
  27. 27.4.4 × 6 — where does the decimal point go? (a) 264 (b) 26.4 (c) 0.264 (d) 2.64
  28. 28.6.3 × 4 — where does the decimal point go? (a) 2.52 (b) 0.252 (c) 252 (d) 25.2
  29. 29.3.4 × 26 — where does the decimal point go? (a) 0.884 (b) 8.84 (c) 884 (d) 88.4
  30. 30.0.56 × 3.3 — where does the decimal point go? (a) 0.1848 (b) 0.01848 (c) 1.848 (d) 18.48
  31. 31.8.8 × 29 — where does the decimal point go? (a) 2552 (b) 25.52 (c) 255.2 (d) 2.552
  32. 32.4.2 × 4.4 — where does the decimal point go? (a) 1.848 (b) 0.1848 (c) 184.8 (d) 18.48
  33. 33.7.3 × 9 — where does the decimal point go? (a) 6.57 (b) 0.657 (c) 65.7 (d) 657
  34. 34.5.4 × 39 — where does the decimal point go? (a) 21.06 (b) 2.106 (c) 2106 (d) 210.6
  35. 35.1.2 × 3.9 — where does the decimal point go? (a) 46.8 (b) 0.0468 (c) 0.468 (d) 4.68
  36. 36.6.3 × 7 — where does the decimal point go? (a) 441 (b) 4.41 (c) 44.1 (d) 0.441
  37. 37.0.51 × 0.6 — where does the decimal point go? (a) 0.0306 (b) 0.306 (c) 0.00306 (d) 3.06
  38. 38.0.72 × 22 — where does the decimal point go? (a) 158.4 (b) 15.84 (c) 1.584 (d) 0.1584
  39. 39.2.3 × 1.1 — where does the decimal point go? (a) 2.53 (b) 25.3 (c) 0.0253 (d) 0.253
  40. 40.6.9 × 0.7 — where does the decimal point go? (a) 4.83 (b) 0.483 (c) 0.0483 (d) 48.3

Answer key

  1. 0.065
  2. 162.5
  3. 3.15
  4. 0.32
  5. 14.4
  6. 97.2
  7. 25.6
  8. 46.5
  9. 11.8
  10. 5.39
  11. 4.64
  12. 13.63
  13. 0.54
  14. 5.31
  15. 79.8
  16. 0.26
  17. 1.95
  18. 109.2
  19. 0.48
  20. 121.5
  21. 1.344
  22. 0.168
  23. 0.602
  24. 2.85
  25. 81.2
  26. 20.8
  27. 26.4
  28. 25.2
  29. 88.4
  30. 1.848
  31. 255.2
  32. 18.48
  33. 65.7
  34. 210.6
  35. 4.68
  36. 44.1
  37. 0.306
  38. 15.84
  39. 2.53
  40. 4.83

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