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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 989 · 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. 1.0.41 × 27 — where does the decimal point go? (a) 11.07 (b) 1.107 (c) 0.1107 (d) 110.7
  2. 2.2.6 × 31 — where does the decimal point go? (a) 80.6 (b) 806 (c) 8.06 (d) 0.806
  3. 3.0.84 × 49 — where does the decimal point go? (a) 0.4116 (b) 41.16 (c) 4.116 (d) 411.6
  4. 4.0.13 × 19 — where does the decimal point go? (a) 2.47 (b) 0.0247 (c) 24.7 (d) 0.247
  5. 5.0.33 × 0.7 — where does the decimal point go? (a) 0.231 (b) 2.31 (c) 0.00231 (d) 0.0231
  6. 6.0.77 × 3 — where does the decimal point go? (a) 23.1 (b) 0.0231 (c) 2.31 (d) 0.231
  7. 7.4.7 × 2 — where does the decimal point go? (a) 0.94 (b) 9.4 (c) 0.094 (d) 94
  8. 8.0.39 × 0.4 — where does the decimal point go? (a) 0.00156 (b) 0.0156 (c) 0.156 (d) 1.56
  9. 9.7.1 × 3.4 — where does the decimal point go? (a) 241.4 (b) 2.414 (c) 24.14 (d) 0.2414
  10. 10.0.19 × 4.6 — where does the decimal point go? (a) 0.874 (b) 0.00874 (c) 8.74 (d) 0.0874
  11. 11.5.2 × 0.8 — where does the decimal point go? (a) 4.16 (b) 41.6 (c) 0.0416 (d) 0.416
  12. 12.4.9 × 2 — where does the decimal point go? (a) 0.098 (b) 9.8 (c) 98 (d) 0.98
  13. 13.0.93 × 7 — where does the decimal point go? (a) 0.651 (b) 65.1 (c) 6.51 (d) 0.0651
  14. 14.0.89 × 23 — where does the decimal point go? (a) 0.2047 (b) 20.47 (c) 2.047 (d) 204.7
  15. 15.0.21 × 35 — where does the decimal point go? (a) 0.0735 (b) 7.35 (c) 73.5 (d) 0.735
  16. 16.7.9 × 2.8 — where does the decimal point go? (a) 0.2212 (b) 22.12 (c) 2.212 (d) 221.2
  17. 17.0.88 × 44 — where does the decimal point go? (a) 0.3872 (b) 387.2 (c) 38.72 (d) 3.872
  18. 18.7.8 × 36 — where does the decimal point go? (a) 280.8 (b) 2.808 (c) 2808 (d) 28.08
  19. 19.0.13 × 4 — where does the decimal point go? (a) 0.0052 (b) 0.52 (c) 0.052 (d) 5.2
  20. 20.0.59 × 1.1 — where does the decimal point go? (a) 0.0649 (b) 0.00649 (c) 0.649 (d) 6.49
  21. 21.0.25 × 0.5 — where does the decimal point go? (a) 0.00125 (b) 1.25 (c) 0.125 (d) 0.0125
  22. 22.0.34 × 32 — where does the decimal point go? (a) 0.1088 (b) 10.88 (c) 1.088 (d) 108.8
  23. 23.3.4 × 4 — where does the decimal point go? (a) 13.6 (b) 0.136 (c) 136 (d) 1.36
  24. 24.2.4 × 3.6 — where does the decimal point go? (a) 8.64 (b) 86.4 (c) 0.864 (d) 0.0864
  25. 25.0.59 × 9 — where does the decimal point go? (a) 53.1 (b) 0.0531 (c) 5.31 (d) 0.531
  26. 26.2.7 × 0.3 — where does the decimal point go? (a) 0.0081 (b) 0.081 (c) 0.81 (d) 8.1
  27. 27.8.6 × 0.3 — where does the decimal point go? (a) 0.258 (b) 2.58 (c) 0.0258 (d) 25.8
  28. 28.8.2 × 48 — where does the decimal point go? (a) 39.36 (b) 3936 (c) 393.6 (d) 3.936
  29. 29.0.58 × 6 — where does the decimal point go? (a) 3.48 (b) 0.348 (c) 34.8 (d) 0.0348
  30. 30.9.7 × 0.2 — where does the decimal point go? (a) 19.4 (b) 0.0194 (c) 0.194 (d) 1.94
  31. 31.0.88 × 3.6 — where does the decimal point go? (a) 0.3168 (b) 3.168 (c) 31.68 (d) 0.03168
  32. 32.7.9 × 1.6 — where does the decimal point go? (a) 1.264 (b) 12.64 (c) 0.1264 (d) 126.4
  33. 33.6.9 × 3 — where does the decimal point go? (a) 20.7 (b) 207 (c) 0.207 (d) 2.07
  34. 34.1.7 × 0.9 — where does the decimal point go? (a) 0.153 (b) 0.0153 (c) 15.3 (d) 1.53
  35. 35.0.15 × 0.3 — where does the decimal point go? (a) 0.045 (b) 0.45 (c) 0.0045 (d) 0.00045
  36. 36.0.74 × 3 — where does the decimal point go? (a) 0.222 (b) 22.2 (c) 2.22 (d) 0.0222
  37. 37.0.57 × 4.5 — where does the decimal point go? (a) 0.02565 (b) 0.2565 (c) 25.65 (d) 2.565
  38. 38.0.17 × 29 — where does the decimal point go? (a) 4.93 (b) 49.3 (c) 0.493 (d) 0.0493
  39. 39.0.53 × 3 — where does the decimal point go? (a) 15.9 (b) 0.0159 (c) 0.159 (d) 1.59
  40. 40.2.9 × 2.4 — where does the decimal point go? (a) 0.696 (b) 6.96 (c) 69.6 (d) 0.0696

Answer key

  1. 11.07
  2. 80.6
  3. 41.16
  4. 2.47
  5. 0.231
  6. 2.31
  7. 9.4
  8. 0.156
  9. 24.14
  10. 0.874
  11. 4.16
  12. 9.8
  13. 6.51
  14. 20.47
  15. 7.35
  16. 22.12
  17. 38.72
  18. 280.8
  19. 0.52
  20. 0.649
  21. 0.125
  22. 10.88
  23. 13.6
  24. 8.64
  25. 5.31
  26. 0.81
  27. 2.58
  28. 393.6
  29. 3.48
  30. 1.94
  31. 3.168
  32. 12.64
  33. 20.7
  34. 1.53
  35. 0.045
  36. 2.22
  37. 2.565
  38. 4.93
  39. 1.59
  40. 6.96

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