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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 346 · 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. 1.0.39 × 0.8 — where does the decimal point go? (a) 0.312 (b) 0.0312 (c) 0.00312 (d) 3.12
  2. 2.0.17 × 1.5 — where does the decimal point go? (a) 0.00255 (b) 0.255 (c) 2.55 (d) 0.0255
  3. 3.6.1 × 14 — where does the decimal point go? (a) 0.854 (b) 854 (c) 8.54 (d) 85.4
  4. 4.0.28 × 0.4 — where does the decimal point go? (a) 1.12 (b) 0.112 (c) 0.00112 (d) 0.0112
  5. 5.9.4 × 0.3 — where does the decimal point go? (a) 0.282 (b) 28.2 (c) 0.0282 (d) 2.82
  6. 6.0.35 × 3.5 — where does the decimal point go? (a) 0.01225 (b) 1.225 (c) 0.1225 (d) 12.25
  7. 7.9.2 × 4 — where does the decimal point go? (a) 3.68 (b) 368 (c) 36.8 (d) 0.368
  8. 8.3.1 × 41 — where does the decimal point go? (a) 127.1 (b) 12.71 (c) 1.271 (d) 1271
  9. 9.4.3 × 1.5 — where does the decimal point go? (a) 0.645 (b) 6.45 (c) 0.0645 (d) 64.5
  10. 10.8.5 × 13 — where does the decimal point go? (a) 11.05 (b) 1.105 (c) 1105 (d) 110.5
  11. 11.9.4 × 0.6 — where does the decimal point go? (a) 0.0564 (b) 0.564 (c) 5.64 (d) 56.4
  12. 12.0.48 × 3.4 — where does the decimal point go? (a) 1.632 (b) 16.32 (c) 0.1632 (d) 0.01632
  13. 13.4.5 × 49 — where does the decimal point go? (a) 220.5 (b) 2205 (c) 22.05 (d) 2.205
  14. 14.0.43 × 0.7 — where does the decimal point go? (a) 0.301 (b) 3.01 (c) 0.00301 (d) 0.0301
  15. 15.0.87 × 3.2 — where does the decimal point go? (a) 2.784 (b) 0.2784 (c) 0.02784 (d) 27.84
  16. 16.0.15 × 5 — where does the decimal point go? (a) 7.5 (b) 0.0075 (c) 0.75 (d) 0.075
  17. 17.0.45 × 1.3 — where does the decimal point go? (a) 5.85 (b) 0.0585 (c) 0.00585 (d) 0.585
  18. 18.7.6 × 0.9 — where does the decimal point go? (a) 0.0684 (b) 0.684 (c) 68.4 (d) 6.84
  19. 19.5.1 × 2.2 — where does the decimal point go? (a) 11.22 (b) 1.122 (c) 0.1122 (d) 112.2
  20. 20.4.5 × 0.7 — where does the decimal point go? (a) 0.315 (b) 31.5 (c) 0.0315 (d) 3.15
  21. 21.0.29 × 14 — where does the decimal point go? (a) 0.406 (b) 4.06 (c) 40.6 (d) 0.0406
  22. 22.2.1 × 0.4 — where does the decimal point go? (a) 0.84 (b) 0.084 (c) 0.0084 (d) 8.4
  23. 23.0.93 × 3 — where does the decimal point go? (a) 0.279 (b) 2.79 (c) 0.0279 (d) 27.9
  24. 24.9.7 × 8 — where does the decimal point go? (a) 0.776 (b) 776 (c) 7.76 (d) 77.6
  25. 25.0.51 × 3 — where does the decimal point go? (a) 0.153 (b) 1.53 (c) 15.3 (d) 0.0153
  26. 26.5.9 × 15 — where does the decimal point go? (a) 885 (b) 8.85 (c) 0.885 (d) 88.5
  27. 27.1.8 × 26 — where does the decimal point go? (a) 0.468 (b) 46.8 (c) 468 (d) 4.68
  28. 28.7.7 × 0.6 — where does the decimal point go? (a) 0.0462 (b) 0.462 (c) 46.2 (d) 4.62
  29. 29.4.4 × 0.3 — where does the decimal point go? (a) 0.132 (b) 1.32 (c) 0.0132 (d) 13.2
  30. 30.9.8 × 4 — where does the decimal point go? (a) 39.2 (b) 3.92 (c) 392 (d) 0.392
  31. 31.1.6 × 32 — where does the decimal point go? (a) 0.512 (b) 5.12 (c) 51.2 (d) 512
  32. 32.0.34 × 0.8 — where does the decimal point go? (a) 2.72 (b) 0.0272 (c) 0.272 (d) 0.00272
  33. 33.3.2 × 0.7 — where does the decimal point go? (a) 0.224 (b) 0.0224 (c) 22.4 (d) 2.24
  34. 34.0.13 × 0.4 — where does the decimal point go? (a) 0.52 (b) 0.052 (c) 0.0052 (d) 0.00052
  35. 35.8.2 × 3.4 — where does the decimal point go? (a) 2.788 (b) 0.2788 (c) 278.8 (d) 27.88
  36. 36.2.8 × 8 — where does the decimal point go? (a) 22.4 (b) 224 (c) 0.224 (d) 2.24
  37. 37.1.8 × 0.8 — where does the decimal point go? (a) 0.144 (b) 0.0144 (c) 14.4 (d) 1.44
  38. 38.0.96 × 0.2 — where does the decimal point go? (a) 0.192 (b) 1.92 (c) 0.00192 (d) 0.0192
  39. 39.0.91 × 0.3 — where does the decimal point go? (a) 0.00273 (b) 0.273 (c) 2.73 (d) 0.0273
  40. 40.9.9 × 0.6 — where does the decimal point go? (a) 59.4 (b) 0.594 (c) 0.0594 (d) 5.94

Answer key

  1. 0.312
  2. 0.255
  3. 85.4
  4. 0.112
  5. 2.82
  6. 1.225
  7. 36.8
  8. 127.1
  9. 6.45
  10. 110.5
  11. 5.64
  12. 1.632
  13. 220.5
  14. 0.301
  15. 2.784
  16. 0.75
  17. 0.585
  18. 6.84
  19. 11.22
  20. 3.15
  21. 4.06
  22. 0.84
  23. 2.79
  24. 77.6
  25. 1.53
  26. 88.5
  27. 46.8
  28. 4.62
  29. 1.32
  30. 39.2
  31. 51.2
  32. 0.272
  33. 2.24
  34. 0.052
  35. 27.88
  36. 22.4
  37. 1.44
  38. 0.192
  39. 0.273
  40. 5.94

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