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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 972 · 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. 1.0.66 × 0.6 — where does the decimal point go? (a) 0.00396 (b) 3.96 (c) 0.0396 (d) 0.396
  2. 2.7.9 × 24 — where does the decimal point go? (a) 18.96 (b) 189.6 (c) 1.896 (d) 1896
  3. 3.0.49 × 0.8 — where does the decimal point go? (a) 0.392 (b) 0.0392 (c) 0.00392 (d) 3.92
  4. 4.7.1 × 7 — where does the decimal point go? (a) 49.7 (b) 0.497 (c) 4.97 (d) 497
  5. 5.1.7 × 4 — where does the decimal point go? (a) 68 (b) 0.068 (c) 6.8 (d) 0.68
  6. 6.7.9 × 1.4 — where does the decimal point go? (a) 0.1106 (b) 110.6 (c) 1.106 (d) 11.06
  7. 7.0.38 × 8 — where does the decimal point go? (a) 0.304 (b) 3.04 (c) 0.0304 (d) 30.4
  8. 8.8.3 × 37 — where does the decimal point go? (a) 30.71 (b) 3.071 (c) 307.1 (d) 3071
  9. 9.3.4 × 0.7 — where does the decimal point go? (a) 2.38 (b) 0.0238 (c) 23.8 (d) 0.238
  10. 10.2.7 × 0.6 — where does the decimal point go? (a) 0.162 (b) 1.62 (c) 16.2 (d) 0.0162
  11. 11.8.6 × 49 — where does the decimal point go? (a) 42.14 (b) 421.4 (c) 4.214 (d) 4214
  12. 12.9.8 × 1.8 — where does the decimal point go? (a) 0.1764 (b) 1.764 (c) 176.4 (d) 17.64
  13. 13.8.2 × 0.4 — where does the decimal point go? (a) 0.328 (b) 32.8 (c) 0.0328 (d) 3.28
  14. 14.0.71 × 0.5 — where does the decimal point go? (a) 0.355 (b) 0.00355 (c) 0.0355 (d) 3.55
  15. 15.1.5 × 39 — where does the decimal point go? (a) 5.85 (b) 0.585 (c) 58.5 (d) 585
  16. 16.0.26 × 0.4 — where does the decimal point go? (a) 0.104 (b) 1.04 (c) 0.0104 (d) 0.00104
  17. 17.6.8 × 2 — where does the decimal point go? (a) 1.36 (b) 0.136 (c) 136 (d) 13.6
  18. 18.5.1 × 2.1 — where does the decimal point go? (a) 107.1 (b) 0.1071 (c) 10.71 (d) 1.071
  19. 19.0.89 × 4 — where does the decimal point go? (a) 0.0356 (b) 35.6 (c) 3.56 (d) 0.356
  20. 20.2.9 × 3 — where does the decimal point go? (a) 87 (b) 0.87 (c) 8.7 (d) 0.087
  21. 21.0.47 × 4 — where does the decimal point go? (a) 1.88 (b) 0.188 (c) 0.0188 (d) 18.8
  22. 22.0.13 × 35 — where does the decimal point go? (a) 45.5 (b) 4.55 (c) 0.455 (d) 0.0455
  23. 23.0.54 × 2.3 — where does the decimal point go? (a) 12.42 (b) 0.1242 (c) 1.242 (d) 0.01242
  24. 24.0.31 × 2.1 — where does the decimal point go? (a) 6.51 (b) 0.0651 (c) 0.00651 (d) 0.651
  25. 25.4.7 × 7 — where does the decimal point go? (a) 3.29 (b) 0.329 (c) 329 (d) 32.9
  26. 26.8.6 × 4 — where does the decimal point go? (a) 0.344 (b) 344 (c) 34.4 (d) 3.44
  27. 27.0.58 × 1.4 — where does the decimal point go? (a) 0.0812 (b) 0.812 (c) 8.12 (d) 0.00812
  28. 28.1.7 × 21 — where does the decimal point go? (a) 0.357 (b) 357 (c) 35.7 (d) 3.57
  29. 29.0.87 × 38 — where does the decimal point go? (a) 3.306 (b) 33.06 (c) 0.3306 (d) 330.6
  30. 30.9.4 × 19 — where does the decimal point go? (a) 178.6 (b) 1.786 (c) 17.86 (d) 1786
  31. 31.0.96 × 41 — where does the decimal point go? (a) 0.3936 (b) 39.36 (c) 3.936 (d) 393.6
  32. 32.7.9 × 5 — where does the decimal point go? (a) 3.95 (b) 39.5 (c) 0.395 (d) 395
  33. 33.4.8 × 3 — where does the decimal point go? (a) 144 (b) 14.4 (c) 0.144 (d) 1.44
  34. 34.1.3 × 8 — where does the decimal point go? (a) 104 (b) 10.4 (c) 1.04 (d) 0.104
  35. 35.0.79 × 32 — where does the decimal point go? (a) 25.28 (b) 0.2528 (c) 2.528 (d) 252.8
  36. 36.3.4 × 2 — where does the decimal point go? (a) 6.8 (b) 0.068 (c) 68 (d) 0.68
  37. 37.2.9 × 6 — where does the decimal point go? (a) 17.4 (b) 1.74 (c) 174 (d) 0.174
  38. 38.5.4 × 2 — where does the decimal point go? (a) 0.108 (b) 1.08 (c) 108 (d) 10.8
  39. 39.0.14 × 4.7 — where does the decimal point go? (a) 0.658 (b) 0.0658 (c) 6.58 (d) 0.00658
  40. 40.0.12 × 4 — where does the decimal point go? (a) 0.048 (b) 0.48 (c) 4.8 (d) 0.0048

Answer key

  1. 0.396
  2. 189.6
  3. 0.392
  4. 49.7
  5. 6.8
  6. 11.06
  7. 3.04
  8. 307.1
  9. 2.38
  10. 1.62
  11. 421.4
  12. 17.64
  13. 3.28
  14. 0.355
  15. 58.5
  16. 0.104
  17. 13.6
  18. 10.71
  19. 3.56
  20. 8.7
  21. 1.88
  22. 4.55
  23. 1.242
  24. 0.651
  25. 32.9
  26. 34.4
  27. 0.812
  28. 35.7
  29. 33.06
  30. 178.6
  31. 39.36
  32. 39.5
  33. 14.4
  34. 10.4
  35. 25.28
  36. 6.8
  37. 17.4
  38. 10.8
  39. 0.658
  40. 0.48

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