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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 130 · 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. 1.0.48 × 3.9 — where does the decimal point go? (a) 0.01872 (b) 1.872 (c) 18.72 (d) 0.1872
  2. 2.0.49 × 3 — where does the decimal point go? (a) 1.47 (b) 0.0147 (c) 14.7 (d) 0.147
  3. 3.9.7 × 5 — where does the decimal point go? (a) 0.485 (b) 4.85 (c) 48.5 (d) 485
  4. 4.0.49 × 4 — where does the decimal point go? (a) 1.96 (b) 0.196 (c) 19.6 (d) 0.0196
  5. 5.0.65 × 25 — where does the decimal point go? (a) 0.1625 (b) 16.25 (c) 1.625 (d) 162.5
  6. 6.0.53 × 0.9 — where does the decimal point go? (a) 0.477 (b) 0.00477 (c) 4.77 (d) 0.0477
  7. 7.3.4 × 0.9 — where does the decimal point go? (a) 0.306 (b) 0.0306 (c) 3.06 (d) 30.6
  8. 8.0.33 × 3 — where does the decimal point go? (a) 0.0099 (b) 9.9 (c) 0.099 (d) 0.99
  9. 9.3.1 × 48 — where does the decimal point go? (a) 1.488 (b) 14.88 (c) 1488 (d) 148.8
  10. 10.0.82 × 1.3 — where does the decimal point go? (a) 1.066 (b) 10.66 (c) 0.1066 (d) 0.01066
  11. 11.6.4 × 8 — where does the decimal point go? (a) 5.12 (b) 0.512 (c) 51.2 (d) 512
  12. 12.5.3 × 1.5 — where does the decimal point go? (a) 0.795 (b) 7.95 (c) 0.0795 (d) 79.5
  13. 13.0.51 × 0.9 — where does the decimal point go? (a) 0.0459 (b) 0.00459 (c) 4.59 (d) 0.459
  14. 14.0.96 × 0.8 — where does the decimal point go? (a) 0.0768 (b) 0.00768 (c) 7.68 (d) 0.768
  15. 15.0.39 × 6 — where does the decimal point go? (a) 23.4 (b) 0.0234 (c) 2.34 (d) 0.234
  16. 16.0.56 × 3.8 — where does the decimal point go? (a) 0.2128 (b) 0.02128 (c) 21.28 (d) 2.128
  17. 17.0.21 × 0.7 — where does the decimal point go? (a) 0.00147 (b) 1.47 (c) 0.147 (d) 0.0147
  18. 18.0.89 × 4 — where does the decimal point go? (a) 0.0356 (b) 0.356 (c) 3.56 (d) 35.6
  19. 19.8.4 × 37 — where does the decimal point go? (a) 3.108 (b) 31.08 (c) 3108 (d) 310.8
  20. 20.0.23 × 7 — where does the decimal point go? (a) 0.161 (b) 0.0161 (c) 16.1 (d) 1.61
  21. 21.0.19 × 2 — where does the decimal point go? (a) 0.038 (b) 3.8 (c) 0.38 (d) 0.0038
  22. 22.0.36 × 34 — where does the decimal point go? (a) 122.4 (b) 1.224 (c) 12.24 (d) 0.1224
  23. 23.0.42 × 29 — where does the decimal point go? (a) 0.1218 (b) 1.218 (c) 12.18 (d) 121.8
  24. 24.0.54 × 0.6 — where does the decimal point go? (a) 3.24 (b) 0.0324 (c) 0.00324 (d) 0.324
  25. 25.3.4 × 0.2 — where does the decimal point go? (a) 6.8 (b) 0.068 (c) 0.0068 (d) 0.68
  26. 26.0.73 × 17 — where does the decimal point go? (a) 1.241 (b) 124.1 (c) 0.1241 (d) 12.41
  27. 27.6.2 × 1.6 — where does the decimal point go? (a) 9.92 (b) 0.0992 (c) 99.2 (d) 0.992
  28. 28.0.23 × 0.6 — where does the decimal point go? (a) 0.138 (b) 0.00138 (c) 0.0138 (d) 1.38
  29. 29.1.8 × 0.4 — where does the decimal point go? (a) 0.072 (b) 7.2 (c) 0.72 (d) 0.0072
  30. 30.8.7 × 4.6 — where does the decimal point go? (a) 40.02 (b) 0.4002 (c) 400.2 (d) 4.002
  31. 31.6.7 × 7 — where does the decimal point go? (a) 469 (b) 46.9 (c) 0.469 (d) 4.69
  32. 32.0.63 × 5 — where does the decimal point go? (a) 31.5 (b) 0.315 (c) 3.15 (d) 0.0315
  33. 33.1.3 × 4 — where does the decimal point go? (a) 52 (b) 0.52 (c) 0.052 (d) 5.2
  34. 34.0.84 × 8 — where does the decimal point go? (a) 0.672 (b) 67.2 (c) 6.72 (d) 0.0672
  35. 35.3.4 × 44 — where does the decimal point go? (a) 14.96 (b) 149.6 (c) 1.496 (d) 1496
  36. 36.8.2 × 43 — where does the decimal point go? (a) 352.6 (b) 3526 (c) 3.526 (d) 35.26
  37. 37.9.3 × 0.9 — where does the decimal point go? (a) 83.7 (b) 8.37 (c) 0.837 (d) 0.0837
  38. 38.5.6 × 2.2 — where does the decimal point go? (a) 0.1232 (b) 1.232 (c) 123.2 (d) 12.32
  39. 39.3.3 × 4.3 — where does the decimal point go? (a) 1.419 (b) 14.19 (c) 141.9 (d) 0.1419
  40. 40.1.4 × 3.6 — where does the decimal point go? (a) 0.504 (b) 5.04 (c) 0.0504 (d) 50.4

Answer key

  1. 1.872
  2. 1.47
  3. 48.5
  4. 1.96
  5. 16.25
  6. 0.477
  7. 3.06
  8. 0.99
  9. 148.8
  10. 1.066
  11. 51.2
  12. 7.95
  13. 0.459
  14. 0.768
  15. 2.34
  16. 2.128
  17. 0.147
  18. 3.56
  19. 310.8
  20. 1.61
  21. 0.38
  22. 12.24
  23. 12.18
  24. 0.324
  25. 0.68
  26. 12.41
  27. 9.92
  28. 0.138
  29. 0.72
  30. 40.02
  31. 46.9
  32. 3.15
  33. 5.2
  34. 6.72
  35. 149.6
  36. 352.6
  37. 8.37
  38. 12.32
  39. 14.19
  40. 5.04

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