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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 746 · 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. 1.5.7 × 18 — where does the decimal point go? (a) 1026 (b) 102.6 (c) 10.26 (d) 1.026
  2. 2.0.53 × 14 — where does the decimal point go? (a) 0.742 (b) 74.2 (c) 0.0742 (d) 7.42
  3. 3.7.7 × 0.7 — where does the decimal point go? (a) 0.0539 (b) 0.539 (c) 5.39 (d) 53.9
  4. 4.5.4 × 0.7 — where does the decimal point go? (a) 0.0378 (b) 0.378 (c) 3.78 (d) 37.8
  5. 5.0.75 × 25 — where does the decimal point go? (a) 0.1875 (b) 18.75 (c) 1.875 (d) 187.5
  6. 6.0.57 × 0.9 — where does the decimal point go? (a) 0.00513 (b) 0.513 (c) 5.13 (d) 0.0513
  7. 7.0.44 × 1.2 — where does the decimal point go? (a) 0.0528 (b) 0.528 (c) 5.28 (d) 0.00528
  8. 8.5.2 × 49 — where does the decimal point go? (a) 254.8 (b) 25.48 (c) 2.548 (d) 2548
  9. 9.0.21 × 17 — where does the decimal point go? (a) 3.57 (b) 35.7 (c) 0.0357 (d) 0.357
  10. 10.8.3 × 3.3 — where does the decimal point go? (a) 2.739 (b) 27.39 (c) 273.9 (d) 0.2739
  11. 11.1.3 × 1.2 — where does the decimal point go? (a) 0.156 (b) 1.56 (c) 0.0156 (d) 15.6
  12. 12.1.6 × 46 — where does the decimal point go? (a) 736 (b) 73.6 (c) 0.736 (d) 7.36
  13. 13.8.7 × 8 — where does the decimal point go? (a) 696 (b) 0.696 (c) 6.96 (d) 69.6
  14. 14.8.3 × 29 — where does the decimal point go? (a) 2.407 (b) 2407 (c) 24.07 (d) 240.7
  15. 15.0.12 × 9 — where does the decimal point go? (a) 10.8 (b) 1.08 (c) 0.108 (d) 0.0108
  16. 16.0.36 × 23 — where does the decimal point go? (a) 8.28 (b) 0.828 (c) 82.8 (d) 0.0828
  17. 17.1.7 × 28 — where does the decimal point go? (a) 0.476 (b) 4.76 (c) 476 (d) 47.6
  18. 18.0.19 × 15 — where does the decimal point go? (a) 0.0285 (b) 2.85 (c) 28.5 (d) 0.285
  19. 19.0.23 × 24 — where does the decimal point go? (a) 0.0552 (b) 55.2 (c) 0.552 (d) 5.52
  20. 20.0.79 × 0.5 — where does the decimal point go? (a) 3.95 (b) 0.0395 (c) 0.395 (d) 0.00395
  21. 21.4.7 × 6 — where does the decimal point go? (a) 2.82 (b) 282 (c) 28.2 (d) 0.282
  22. 22.0.36 × 1.2 — where does the decimal point go? (a) 0.432 (b) 4.32 (c) 0.00432 (d) 0.0432
  23. 23.0.19 × 0.3 — where does the decimal point go? (a) 0.0057 (b) 0.057 (c) 0.57 (d) 0.00057
  24. 24.0.32 × 7 — where does the decimal point go? (a) 0.224 (b) 22.4 (c) 0.0224 (d) 2.24
  25. 25.3.4 × 4 — where does the decimal point go? (a) 136 (b) 13.6 (c) 1.36 (d) 0.136
  26. 26.5.6 × 39 — where does the decimal point go? (a) 2.184 (b) 2184 (c) 218.4 (d) 21.84
  27. 27.3.1 × 0.7 — where does the decimal point go? (a) 2.17 (b) 0.0217 (c) 21.7 (d) 0.217
  28. 28.0.32 × 3 — where does the decimal point go? (a) 0.096 (b) 0.0096 (c) 9.6 (d) 0.96
  29. 29.6.9 × 12 — where does the decimal point go? (a) 8.28 (b) 828 (c) 82.8 (d) 0.828
  30. 30.0.78 × 2 — where does the decimal point go? (a) 0.156 (b) 1.56 (c) 15.6 (d) 0.0156
  31. 31.0.39 × 18 — where does the decimal point go? (a) 0.702 (b) 7.02 (c) 0.0702 (d) 70.2
  32. 32.0.37 × 8 — where does the decimal point go? (a) 2.96 (b) 29.6 (c) 0.0296 (d) 0.296
  33. 33.7.8 × 2.9 — where does the decimal point go? (a) 2.262 (b) 0.2262 (c) 226.2 (d) 22.62
  34. 34.0.47 × 0.5 — where does the decimal point go? (a) 0.00235 (b) 0.0235 (c) 2.35 (d) 0.235
  35. 35.0.31 × 5 — where does the decimal point go? (a) 1.55 (b) 0.0155 (c) 0.155 (d) 15.5
  36. 36.9.7 × 0.3 — where does the decimal point go? (a) 2.91 (b) 29.1 (c) 0.0291 (d) 0.291
  37. 37.0.69 × 0.4 — where does the decimal point go? (a) 0.0276 (b) 0.276 (c) 0.00276 (d) 2.76
  38. 38.0.97 × 0.9 — where does the decimal point go? (a) 0.00873 (b) 0.873 (c) 8.73 (d) 0.0873
  39. 39.4.3 × 13 — where does the decimal point go? (a) 5.59 (b) 559 (c) 0.559 (d) 55.9
  40. 40.4.5 × 0.7 — where does the decimal point go? (a) 0.0315 (b) 31.5 (c) 3.15 (d) 0.315

Answer key

  1. 102.6
  2. 7.42
  3. 5.39
  4. 3.78
  5. 18.75
  6. 0.513
  7. 0.528
  8. 254.8
  9. 3.57
  10. 27.39
  11. 1.56
  12. 73.6
  13. 69.6
  14. 240.7
  15. 1.08
  16. 8.28
  17. 47.6
  18. 2.85
  19. 5.52
  20. 0.395
  21. 28.2
  22. 0.432
  23. 0.057
  24. 2.24
  25. 13.6
  26. 218.4
  27. 2.17
  28. 0.96
  29. 82.8
  30. 1.56
  31. 7.02
  32. 2.96
  33. 22.62
  34. 0.235
  35. 1.55
  36. 2.91
  37. 0.276
  38. 0.873
  39. 55.9
  40. 3.15

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