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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 520 · 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. 1.0.97 × 4 — where does the decimal point go? (a) 3.88 (b) 0.388 (c) 38.8 (d) 0.0388
  2. 2.0.58 × 0.4 — where does the decimal point go? (a) 2.32 (b) 0.00232 (c) 0.232 (d) 0.0232
  3. 3.4.8 × 3.2 — where does the decimal point go? (a) 15.36 (b) 0.1536 (c) 1.536 (d) 153.6
  4. 4.0.17 × 4.2 — where does the decimal point go? (a) 0.0714 (b) 0.00714 (c) 7.14 (d) 0.714
  5. 5.0.56 × 8 — where does the decimal point go? (a) 0.0448 (b) 0.448 (c) 4.48 (d) 44.8
  6. 6.8.3 × 0.7 — where does the decimal point go? (a) 58.1 (b) 0.0581 (c) 5.81 (d) 0.581
  7. 7.0.86 × 1.1 — where does the decimal point go? (a) 0.946 (b) 9.46 (c) 0.00946 (d) 0.0946
  8. 8.6.7 × 0.9 — where does the decimal point go? (a) 6.03 (b) 0.0603 (c) 60.3 (d) 0.603
  9. 9.0.52 × 1.4 — where does the decimal point go? (a) 0.728 (b) 7.28 (c) 0.0728 (d) 0.00728
  10. 10.0.92 × 14 — where does the decimal point go? (a) 1.288 (b) 128.8 (c) 0.1288 (d) 12.88
  11. 11.0.14 × 24 — where does the decimal point go? (a) 0.336 (b) 33.6 (c) 0.0336 (d) 3.36
  12. 12.2.7 × 1.7 — where does the decimal point go? (a) 4.59 (b) 0.459 (c) 45.9 (d) 0.0459
  13. 13.0.83 × 1.2 — where does the decimal point go? (a) 0.0996 (b) 0.00996 (c) 9.96 (d) 0.996
  14. 14.7.8 × 24 — where does the decimal point go? (a) 1.872 (b) 187.2 (c) 18.72 (d) 1872
  15. 15.2.6 × 2 — where does the decimal point go? (a) 5.2 (b) 0.052 (c) 52 (d) 0.52
  16. 16.0.77 × 0.3 — where does the decimal point go? (a) 0.00231 (b) 2.31 (c) 0.231 (d) 0.0231
  17. 17.9.7 × 2.9 — where does the decimal point go? (a) 2.813 (b) 281.3 (c) 0.2813 (d) 28.13
  18. 18.2.8 × 9 — where does the decimal point go? (a) 2.52 (b) 0.252 (c) 25.2 (d) 252
  19. 19.5.3 × 4 — where does the decimal point go? (a) 2.12 (b) 21.2 (c) 212 (d) 0.212
  20. 20.7.7 × 0.6 — where does the decimal point go? (a) 46.2 (b) 0.0462 (c) 0.462 (d) 4.62
  21. 21.0.78 × 2.6 — where does the decimal point go? (a) 2.028 (b) 20.28 (c) 0.2028 (d) 0.02028
  22. 22.7.2 × 4 — where does the decimal point go? (a) 288 (b) 2.88 (c) 28.8 (d) 0.288
  23. 23.7.9 × 25 — where does the decimal point go? (a) 1.975 (b) 1975 (c) 19.75 (d) 197.5
  24. 24.1.9 × 1.4 — where does the decimal point go? (a) 26.6 (b) 0.266 (c) 0.0266 (d) 2.66
  25. 25.2.2 × 2 — where does the decimal point go? (a) 4.4 (b) 44 (c) 0.44 (d) 0.044
  26. 26.0.42 × 49 — where does the decimal point go? (a) 2.058 (b) 20.58 (c) 0.2058 (d) 205.8
  27. 27.7.8 × 1.4 — where does the decimal point go? (a) 109.2 (b) 10.92 (c) 1.092 (d) 0.1092
  28. 28.2.4 × 14 — where does the decimal point go? (a) 33.6 (b) 3.36 (c) 0.336 (d) 336
  29. 29.0.98 × 4.2 — where does the decimal point go? (a) 0.04116 (b) 41.16 (c) 0.4116 (d) 4.116
  30. 30.0.73 × 2.5 — where does the decimal point go? (a) 0.1825 (b) 0.01825 (c) 18.25 (d) 1.825
  31. 31.0.82 × 2 — where does the decimal point go? (a) 16.4 (b) 0.164 (c) 1.64 (d) 0.0164
  32. 32.5.4 × 8 — where does the decimal point go? (a) 4.32 (b) 0.432 (c) 432 (d) 43.2
  33. 33.6.1 × 2 — where does the decimal point go? (a) 122 (b) 1.22 (c) 0.122 (d) 12.2
  34. 34.9.9 × 0.2 — where does the decimal point go? (a) 0.198 (b) 1.98 (c) 0.0198 (d) 19.8
  35. 35.4.1 × 1.1 — where does the decimal point go? (a) 0.451 (b) 4.51 (c) 0.0451 (d) 45.1
  36. 36.3.1 × 11 — where does the decimal point go? (a) 3.41 (b) 34.1 (c) 0.341 (d) 341
  37. 37.0.61 × 35 — where does the decimal point go? (a) 0.2135 (b) 2.135 (c) 213.5 (d) 21.35
  38. 38.2.6 × 0.3 — where does the decimal point go? (a) 0.078 (b) 0.0078 (c) 7.8 (d) 0.78
  39. 39.0.23 × 2.6 — where does the decimal point go? (a) 0.0598 (b) 0.598 (c) 0.00598 (d) 5.98
  40. 40.1.6 × 41 — where does the decimal point go? (a) 0.656 (b) 6.56 (c) 65.6 (d) 656

Answer key

  1. 3.88
  2. 0.232
  3. 15.36
  4. 0.714
  5. 4.48
  6. 5.81
  7. 0.946
  8. 6.03
  9. 0.728
  10. 12.88
  11. 3.36
  12. 4.59
  13. 0.996
  14. 187.2
  15. 5.2
  16. 0.231
  17. 28.13
  18. 25.2
  19. 21.2
  20. 4.62
  21. 2.028
  22. 28.8
  23. 197.5
  24. 2.66
  25. 4.4
  26. 20.58
  27. 10.92
  28. 33.6
  29. 4.116
  30. 1.825
  31. 1.64
  32. 43.2
  33. 12.2
  34. 1.98
  35. 4.51
  36. 34.1
  37. 21.35
  38. 0.78
  39. 0.598
  40. 65.6

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