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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 554 · 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. 1.0.82 × 9 — where does the decimal point go? (a) 7.38 (b) 0.738 (c) 73.8 (d) 0.0738
  2. 2.0.39 × 34 — where does the decimal point go? (a) 0.1326 (b) 1.326 (c) 132.6 (d) 13.26
  3. 3.2.9 × 0.9 — where does the decimal point go? (a) 2.61 (b) 26.1 (c) 0.261 (d) 0.0261
  4. 4.3.6 × 36 — where does the decimal point go? (a) 1.296 (b) 129.6 (c) 1296 (d) 12.96
  5. 5.0.37 × 4 — where does the decimal point go? (a) 14.8 (b) 0.148 (c) 1.48 (d) 0.0148
  6. 6.5.6 × 1.6 — where does the decimal point go? (a) 0.0896 (b) 0.896 (c) 8.96 (d) 89.6
  7. 7.9.1 × 0.4 — where does the decimal point go? (a) 36.4 (b) 3.64 (c) 0.0364 (d) 0.364
  8. 8.2.9 × 3 — where does the decimal point go? (a) 87 (b) 0.087 (c) 0.87 (d) 8.7
  9. 9.1.6 × 32 — where does the decimal point go? (a) 512 (b) 0.512 (c) 5.12 (d) 51.2
  10. 10.0.31 × 2.2 — where does the decimal point go? (a) 0.0682 (b) 0.682 (c) 6.82 (d) 0.00682
  11. 11.0.55 × 5 — where does the decimal point go? (a) 27.5 (b) 0.275 (c) 2.75 (d) 0.0275
  12. 12.7.9 × 13 — where does the decimal point go? (a) 1027 (b) 1.027 (c) 102.7 (d) 10.27
  13. 13.0.27 × 0.2 — where does the decimal point go? (a) 0.00054 (b) 0.54 (c) 0.054 (d) 0.0054
  14. 14.5.2 × 3.6 — where does the decimal point go? (a) 18.72 (b) 187.2 (c) 1.872 (d) 0.1872
  15. 15.6.5 × 4.9 — where does the decimal point go? (a) 318.5 (b) 31.85 (c) 0.3185 (d) 3.185
  16. 16.0.77 × 0.4 — where does the decimal point go? (a) 0.308 (b) 3.08 (c) 0.0308 (d) 0.00308
  17. 17.6.1 × 16 — where does the decimal point go? (a) 9.76 (b) 976 (c) 0.976 (d) 97.6
  18. 18.0.43 × 2 — where does the decimal point go? (a) 8.6 (b) 0.0086 (c) 0.086 (d) 0.86
  19. 19.0.59 × 8 — where does the decimal point go? (a) 0.472 (b) 4.72 (c) 0.0472 (d) 47.2
  20. 20.3.7 × 21 — where does the decimal point go? (a) 77.7 (b) 7.77 (c) 0.777 (d) 777
  21. 21.0.87 × 2.1 — where does the decimal point go? (a) 1.827 (b) 18.27 (c) 0.01827 (d) 0.1827
  22. 22.9.3 × 4.6 — where does the decimal point go? (a) 427.8 (b) 42.78 (c) 4.278 (d) 0.4278
  23. 23.0.41 × 0.6 — where does the decimal point go? (a) 0.0246 (b) 0.246 (c) 0.00246 (d) 2.46
  24. 24.3.9 × 24 — where does the decimal point go? (a) 936 (b) 93.6 (c) 0.936 (d) 9.36
  25. 25.0.27 × 3.9 — where does the decimal point go? (a) 10.53 (b) 0.01053 (c) 0.1053 (d) 1.053
  26. 26.5.8 × 1.2 — where does the decimal point go? (a) 6.96 (b) 0.696 (c) 69.6 (d) 0.0696
  27. 27.0.14 × 37 — where does the decimal point go? (a) 0.518 (b) 0.0518 (c) 51.8 (d) 5.18
  28. 28.7.9 × 3 — where does the decimal point go? (a) 0.237 (b) 23.7 (c) 2.37 (d) 237
  29. 29.0.52 × 8 — where does the decimal point go? (a) 0.0416 (b) 41.6 (c) 0.416 (d) 4.16
  30. 30.5.5 × 0.5 — where does the decimal point go? (a) 27.5 (b) 2.75 (c) 0.275 (d) 0.0275
  31. 31.5.9 × 2.6 — where does the decimal point go? (a) 0.1534 (b) 1.534 (c) 15.34 (d) 153.4
  32. 32.7.3 × 4 — where does the decimal point go? (a) 292 (b) 0.292 (c) 29.2 (d) 2.92
  33. 33.1.8 × 2 — where does the decimal point go? (a) 0.036 (b) 3.6 (c) 0.36 (d) 36
  34. 34.0.51 × 1.6 — where does the decimal point go? (a) 8.16 (b) 0.816 (c) 0.00816 (d) 0.0816
  35. 35.0.14 × 26 — where does the decimal point go? (a) 0.364 (b) 0.0364 (c) 36.4 (d) 3.64
  36. 36.0.69 × 0.3 — where does the decimal point go? (a) 0.0207 (b) 0.00207 (c) 0.207 (d) 2.07
  37. 37.8.2 × 4 — where does the decimal point go? (a) 328 (b) 32.8 (c) 3.28 (d) 0.328
  38. 38.0.78 × 7 — where does the decimal point go? (a) 54.6 (b) 0.546 (c) 5.46 (d) 0.0546
  39. 39.0.74 × 43 — where does the decimal point go? (a) 31.82 (b) 3.182 (c) 0.3182 (d) 318.2
  40. 40.7.9 × 2 — where does the decimal point go? (a) 15.8 (b) 0.158 (c) 158 (d) 1.58

Answer key

  1. 7.38
  2. 13.26
  3. 2.61
  4. 129.6
  5. 1.48
  6. 8.96
  7. 3.64
  8. 8.7
  9. 51.2
  10. 0.682
  11. 2.75
  12. 102.7
  13. 0.054
  14. 18.72
  15. 31.85
  16. 0.308
  17. 97.6
  18. 0.86
  19. 4.72
  20. 77.7
  21. 1.827
  22. 42.78
  23. 0.246
  24. 93.6
  25. 1.053
  26. 6.96
  27. 5.18
  28. 23.7
  29. 4.16
  30. 2.75
  31. 15.34
  32. 29.2
  33. 3.6
  34. 0.816
  35. 3.64
  36. 0.207
  37. 32.8
  38. 5.46
  39. 31.82
  40. 15.8

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