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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 76 · 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. 1.2.1 × 9 — where does the decimal point go? (a) 189 (b) 1.89 (c) 0.189 (d) 18.9
  2. 2.0.21 × 5 — where does the decimal point go? (a) 0.0105 (b) 1.05 (c) 0.105 (d) 10.5
  3. 3.3.2 × 4.7 — where does the decimal point go? (a) 150.4 (b) 1.504 (c) 15.04 (d) 0.1504
  4. 4.0.14 × 4.6 — where does the decimal point go? (a) 6.44 (b) 0.00644 (c) 0.644 (d) 0.0644
  5. 5.0.25 × 0.9 — where does the decimal point go? (a) 0.0225 (b) 0.225 (c) 2.25 (d) 0.00225
  6. 6.3.8 × 3 — where does the decimal point go? (a) 1.14 (b) 114 (c) 11.4 (d) 0.114
  7. 7.9.9 × 2.5 — where does the decimal point go? (a) 2.475 (b) 0.2475 (c) 247.5 (d) 24.75
  8. 8.7.6 × 0.2 — where does the decimal point go? (a) 0.0152 (b) 0.152 (c) 15.2 (d) 1.52
  9. 9.8.3 × 5 — where does the decimal point go? (a) 41.5 (b) 4.15 (c) 415 (d) 0.415
  10. 10.6.1 × 6 — where does the decimal point go? (a) 36.6 (b) 0.366 (c) 3.66 (d) 366
  11. 11.0.31 × 39 — where does the decimal point go? (a) 120.9 (b) 1.209 (c) 12.09 (d) 0.1209
  12. 12.3.9 × 0.9 — where does the decimal point go? (a) 0.0351 (b) 3.51 (c) 35.1 (d) 0.351
  13. 13.0.91 × 5 — where does the decimal point go? (a) 45.5 (b) 4.55 (c) 0.455 (d) 0.0455
  14. 14.3.2 × 2.1 — where does the decimal point go? (a) 0.672 (b) 67.2 (c) 6.72 (d) 0.0672
  15. 15.0.18 × 8 — where does the decimal point go? (a) 0.0144 (b) 1.44 (c) 14.4 (d) 0.144
  16. 16.0.56 × 41 — where does the decimal point go? (a) 22.96 (b) 2.296 (c) 0.2296 (d) 229.6
  17. 17.4.4 × 0.8 — where does the decimal point go? (a) 3.52 (b) 35.2 (c) 0.0352 (d) 0.352
  18. 18.1.4 × 0.9 — where does the decimal point go? (a) 0.126 (b) 0.0126 (c) 12.6 (d) 1.26
  19. 19.0.69 × 0.4 — where does the decimal point go? (a) 0.00276 (b) 0.276 (c) 0.0276 (d) 2.76
  20. 20.9.1 × 3 — where does the decimal point go? (a) 2.73 (b) 27.3 (c) 273 (d) 0.273
  21. 21.0.36 × 0.9 — where does the decimal point go? (a) 3.24 (b) 0.324 (c) 0.00324 (d) 0.0324
  22. 22.1.6 × 6 — where does the decimal point go? (a) 0.096 (b) 9.6 (c) 0.96 (d) 96
  23. 23.2.4 × 0.4 — where does the decimal point go? (a) 0.96 (b) 0.0096 (c) 9.6 (d) 0.096
  24. 24.2.2 × 8 — where does the decimal point go? (a) 17.6 (b) 1.76 (c) 0.176 (d) 176
  25. 25.8.2 × 3.3 — where does the decimal point go? (a) 0.2706 (b) 27.06 (c) 2.706 (d) 270.6
  26. 26.5.3 × 1.3 — where does the decimal point go? (a) 0.689 (b) 0.0689 (c) 6.89 (d) 68.9
  27. 27.0.65 × 13 — where does the decimal point go? (a) 0.845 (b) 0.0845 (c) 8.45 (d) 84.5
  28. 28.0.23 × 3 — where does the decimal point go? (a) 0.0069 (b) 0.069 (c) 6.9 (d) 0.69
  29. 29.6.6 × 0.6 — where does the decimal point go? (a) 0.0396 (b) 0.396 (c) 3.96 (d) 39.6
  30. 30.6.9 × 0.4 — where does the decimal point go? (a) 27.6 (b) 0.0276 (c) 2.76 (d) 0.276
  31. 31.0.26 × 29 — where does the decimal point go? (a) 7.54 (b) 75.4 (c) 0.0754 (d) 0.754
  32. 32.0.36 × 0.3 — where does the decimal point go? (a) 0.108 (b) 0.00108 (c) 0.0108 (d) 1.08
  33. 33.8.1 × 35 — where does the decimal point go? (a) 283.5 (b) 28.35 (c) 2.835 (d) 2835
  34. 34.5.7 × 12 — where does the decimal point go? (a) 0.684 (b) 6.84 (c) 68.4 (d) 684
  35. 35.0.58 × 0.3 — where does the decimal point go? (a) 1.74 (b) 0.00174 (c) 0.0174 (d) 0.174
  36. 36.4.4 × 0.7 — where does the decimal point go? (a) 3.08 (b) 30.8 (c) 0.308 (d) 0.0308
  37. 37.5.4 × 1.6 — where does the decimal point go? (a) 8.64 (b) 86.4 (c) 0.864 (d) 0.0864
  38. 38.5.4 × 4 — where does the decimal point go? (a) 0.216 (b) 216 (c) 21.6 (d) 2.16
  39. 39.4.5 × 1.9 — where does the decimal point go? (a) 0.855 (b) 85.5 (c) 0.0855 (d) 8.55
  40. 40.2.1 × 1.5 — where does the decimal point go? (a) 3.15 (b) 0.0315 (c) 31.5 (d) 0.315

Answer key

  1. 18.9
  2. 1.05
  3. 15.04
  4. 0.644
  5. 0.225
  6. 11.4
  7. 24.75
  8. 1.52
  9. 41.5
  10. 36.6
  11. 12.09
  12. 3.51
  13. 4.55
  14. 6.72
  15. 1.44
  16. 22.96
  17. 3.52
  18. 1.26
  19. 0.276
  20. 27.3
  21. 0.324
  22. 9.6
  23. 0.96
  24. 17.6
  25. 27.06
  26. 6.89
  27. 8.45
  28. 0.69
  29. 3.96
  30. 2.76
  31. 7.54
  32. 0.108
  33. 283.5
  34. 68.4
  35. 0.174
  36. 3.08
  37. 8.64
  38. 21.6
  39. 8.55
  40. 3.15

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