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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 314 · 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. 1.2.3 × 0.7 — where does the decimal point go? (a) 0.0161 (b) 0.161 (c) 1.61 (d) 16.1
  2. 2.5.7 × 0.7 — where does the decimal point go? (a) 39.9 (b) 0.0399 (c) 3.99 (d) 0.399
  3. 3.8.1 × 5 — where does the decimal point go? (a) 4.05 (b) 405 (c) 40.5 (d) 0.405
  4. 4.0.56 × 18 — where does the decimal point go? (a) 100.8 (b) 10.08 (c) 1.008 (d) 0.1008
  5. 5.8.7 × 0.8 — where does the decimal point go? (a) 0.696 (b) 0.0696 (c) 6.96 (d) 69.6
  6. 6.2.2 × 9 — where does the decimal point go? (a) 1.98 (b) 198 (c) 0.198 (d) 19.8
  7. 7.5.9 × 7 — where does the decimal point go? (a) 41.3 (b) 4.13 (c) 0.413 (d) 413
  8. 8.0.48 × 9 — where does the decimal point go? (a) 4.32 (b) 0.432 (c) 43.2 (d) 0.0432
  9. 9.3.7 × 15 — where does the decimal point go? (a) 0.555 (b) 55.5 (c) 555 (d) 5.55
  10. 10.0.36 × 46 — where does the decimal point go? (a) 1.656 (b) 165.6 (c) 16.56 (d) 0.1656
  11. 11.5.4 × 4 — where does the decimal point go? (a) 21.6 (b) 2.16 (c) 0.216 (d) 216
  12. 12.5.3 × 37 — where does the decimal point go? (a) 1961 (b) 196.1 (c) 1.961 (d) 19.61
  13. 13.0.61 × 0.7 — where does the decimal point go? (a) 0.427 (b) 0.00427 (c) 0.0427 (d) 4.27
  14. 14.8.7 × 3 — where does the decimal point go? (a) 26.1 (b) 0.261 (c) 261 (d) 2.61
  15. 15.6.2 × 4.4 — where does the decimal point go? (a) 2.728 (b) 27.28 (c) 0.2728 (d) 272.8
  16. 16.0.41 × 0.3 — where does the decimal point go? (a) 0.0123 (b) 1.23 (c) 0.00123 (d) 0.123
  17. 17.0.41 × 3 — where does the decimal point go? (a) 0.0123 (b) 0.123 (c) 1.23 (d) 12.3
  18. 18.0.22 × 3 — where does the decimal point go? (a) 0.66 (b) 0.066 (c) 0.0066 (d) 6.6
  19. 19.3.1 × 0.2 — where does the decimal point go? (a) 6.2 (b) 0.62 (c) 0.062 (d) 0.0062
  20. 20.0.32 × 39 — where does the decimal point go? (a) 1.248 (b) 124.8 (c) 12.48 (d) 0.1248
  21. 21.7.9 × 8 — where does the decimal point go? (a) 6.32 (b) 632 (c) 0.632 (d) 63.2
  22. 22.0.79 × 18 — where does the decimal point go? (a) 142.2 (b) 0.1422 (c) 1.422 (d) 14.22
  23. 23.0.27 × 0.8 — where does the decimal point go? (a) 0.216 (b) 0.0216 (c) 2.16 (d) 0.00216
  24. 24.5.7 × 2.1 — where does the decimal point go? (a) 119.7 (b) 1.197 (c) 11.97 (d) 0.1197
  25. 25.0.35 × 27 — where does the decimal point go? (a) 0.0945 (b) 9.45 (c) 0.945 (d) 94.5
  26. 26.2.7 × 6 — where does the decimal point go? (a) 1.62 (b) 16.2 (c) 0.162 (d) 162
  27. 27.0.47 × 7 — where does the decimal point go? (a) 32.9 (b) 0.329 (c) 3.29 (d) 0.0329
  28. 28.6.1 × 6 — where does the decimal point go? (a) 0.366 (b) 36.6 (c) 366 (d) 3.66
  29. 29.0.16 × 7 — where does the decimal point go? (a) 0.0112 (b) 0.112 (c) 11.2 (d) 1.12
  30. 30.2.2 × 3.8 — where does the decimal point go? (a) 0.0836 (b) 0.836 (c) 83.6 (d) 8.36
  31. 31.1.7 × 0.6 — where does the decimal point go? (a) 10.2 (b) 0.0102 (c) 0.102 (d) 1.02
  32. 32.0.14 × 4 — where does the decimal point go? (a) 0.056 (b) 5.6 (c) 0.0056 (d) 0.56
  33. 33.4.2 × 31 — where does the decimal point go? (a) 13.02 (b) 1302 (c) 130.2 (d) 1.302
  34. 34.0.81 × 0.6 — where does the decimal point go? (a) 0.00486 (b) 4.86 (c) 0.486 (d) 0.0486
  35. 35.0.83 × 9 — where does the decimal point go? (a) 0.747 (b) 7.47 (c) 0.0747 (d) 74.7
  36. 36.7.8 × 19 — where does the decimal point go? (a) 148.2 (b) 14.82 (c) 1482 (d) 1.482
  37. 37.7.7 × 9 — where does the decimal point go? (a) 69.3 (b) 6.93 (c) 0.693 (d) 693
  38. 38.4.7 × 0.9 — where does the decimal point go? (a) 0.423 (b) 42.3 (c) 0.0423 (d) 4.23
  39. 39.0.28 × 4.6 — where does the decimal point go? (a) 0.01288 (b) 12.88 (c) 0.1288 (d) 1.288
  40. 40.9.7 × 0.2 — where does the decimal point go? (a) 1.94 (b) 0.194 (c) 19.4 (d) 0.0194

Answer key

  1. 1.61
  2. 3.99
  3. 40.5
  4. 10.08
  5. 6.96
  6. 19.8
  7. 41.3
  8. 4.32
  9. 55.5
  10. 16.56
  11. 21.6
  12. 196.1
  13. 0.427
  14. 26.1
  15. 27.28
  16. 0.123
  17. 1.23
  18. 0.66
  19. 0.62
  20. 12.48
  21. 63.2
  22. 14.22
  23. 0.216
  24. 11.97
  25. 9.45
  26. 16.2
  27. 3.29
  28. 36.6
  29. 1.12
  30. 8.36
  31. 1.02
  32. 0.56
  33. 130.2
  34. 0.486
  35. 7.47
  36. 148.2
  37. 69.3
  38. 4.23
  39. 1.288
  40. 1.94

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