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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 380 · 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. 1.0.16 × 0.4 — where does the decimal point go? (a) 0.00064 (b) 0.64 (c) 0.064 (d) 0.0064
  2. 2.0.32 × 2 — where does the decimal point go? (a) 6.4 (b) 0.0064 (c) 0.064 (d) 0.64
  3. 3.0.61 × 32 — where does the decimal point go? (a) 1.952 (b) 19.52 (c) 0.1952 (d) 195.2
  4. 4.6.4 × 3.8 — where does the decimal point go? (a) 2.432 (b) 24.32 (c) 243.2 (d) 0.2432
  5. 5.6.4 × 42 — where does the decimal point go? (a) 268.8 (b) 2.688 (c) 26.88 (d) 2688
  6. 6.0.12 × 21 — where does the decimal point go? (a) 0.0252 (b) 25.2 (c) 2.52 (d) 0.252
  7. 7.0.88 × 48 — where does the decimal point go? (a) 422.4 (b) 42.24 (c) 4.224 (d) 0.4224
  8. 8.3.5 × 37 — where does the decimal point go? (a) 129.5 (b) 1295 (c) 1.295 (d) 12.95
  9. 9.8.9 × 0.8 — where does the decimal point go? (a) 7.12 (b) 71.2 (c) 0.712 (d) 0.0712
  10. 10.0.87 × 0.2 — where does the decimal point go? (a) 0.00174 (b) 0.174 (c) 0.0174 (d) 1.74
  11. 11.6.3 × 7 — where does the decimal point go? (a) 0.441 (b) 4.41 (c) 441 (d) 44.1
  12. 12.5.6 × 0.2 — where does the decimal point go? (a) 1.12 (b) 0.0112 (c) 11.2 (d) 0.112
  13. 13.2.7 × 9 — where does the decimal point go? (a) 243 (b) 2.43 (c) 0.243 (d) 24.3
  14. 14.6.4 × 16 — where does the decimal point go? (a) 1024 (b) 1.024 (c) 10.24 (d) 102.4
  15. 15.7.4 × 0.8 — where does the decimal point go? (a) 0.592 (b) 5.92 (c) 59.2 (d) 0.0592
  16. 16.0.89 × 0.6 — where does the decimal point go? (a) 5.34 (b) 0.0534 (c) 0.534 (d) 0.00534
  17. 17.5.7 × 7 — where does the decimal point go? (a) 399 (b) 3.99 (c) 0.399 (d) 39.9
  18. 18.0.45 × 2.7 — where does the decimal point go? (a) 0.1215 (b) 12.15 (c) 1.215 (d) 0.01215
  19. 19.2.6 × 36 — where does the decimal point go? (a) 9.36 (b) 93.6 (c) 936 (d) 0.936
  20. 20.2.7 × 2.7 — where does the decimal point go? (a) 72.9 (b) 0.729 (c) 0.0729 (d) 7.29
  21. 21.0.66 × 7 — where does the decimal point go? (a) 46.2 (b) 0.0462 (c) 4.62 (d) 0.462
  22. 22.0.88 × 3 — where does the decimal point go? (a) 0.264 (b) 26.4 (c) 0.0264 (d) 2.64
  23. 23.0.28 × 4 — where does the decimal point go? (a) 1.12 (b) 0.0112 (c) 11.2 (d) 0.112
  24. 24.0.49 × 5 — where does the decimal point go? (a) 24.5 (b) 0.0245 (c) 2.45 (d) 0.245
  25. 25.9.1 × 1.8 — where does the decimal point go? (a) 0.1638 (b) 163.8 (c) 1.638 (d) 16.38
  26. 26.0.26 × 2 — where does the decimal point go? (a) 0.52 (b) 0.052 (c) 5.2 (d) 0.0052
  27. 27.5.4 × 1.7 — where does the decimal point go? (a) 91.8 (b) 9.18 (c) 0.918 (d) 0.0918
  28. 28.9.1 × 8 — where does the decimal point go? (a) 72.8 (b) 0.728 (c) 7.28 (d) 728
  29. 29.0.27 × 8 — where does the decimal point go? (a) 2.16 (b) 0.216 (c) 21.6 (d) 0.0216
  30. 30.5.3 × 12 — where does the decimal point go? (a) 6.36 (b) 636 (c) 63.6 (d) 0.636
  31. 31.0.58 × 0.2 — where does the decimal point go? (a) 0.116 (b) 0.00116 (c) 1.16 (d) 0.0116
  32. 32.5.8 × 1.4 — where does the decimal point go? (a) 0.812 (b) 0.0812 (c) 81.2 (d) 8.12
  33. 33.0.61 × 1.3 — where does the decimal point go? (a) 0.00793 (b) 0.793 (c) 7.93 (d) 0.0793
  34. 34.8.3 × 3 — where does the decimal point go? (a) 249 (b) 2.49 (c) 24.9 (d) 0.249
  35. 35.3.3 × 0.4 — where does the decimal point go? (a) 1.32 (b) 0.132 (c) 0.0132 (d) 13.2
  36. 36.0.14 × 0.2 — where does the decimal point go? (a) 0.028 (b) 0.00028 (c) 0.0028 (d) 0.28
  37. 37.0.72 × 18 — where does the decimal point go? (a) 0.1296 (b) 129.6 (c) 1.296 (d) 12.96
  38. 38.0.72 × 0.7 — where does the decimal point go? (a) 0.0504 (b) 0.504 (c) 0.00504 (d) 5.04
  39. 39.5.6 × 2.2 — where does the decimal point go? (a) 12.32 (b) 0.1232 (c) 123.2 (d) 1.232
  40. 40.3.4 × 3 — where does the decimal point go? (a) 102 (b) 0.102 (c) 1.02 (d) 10.2

Answer key

  1. 0.064
  2. 0.64
  3. 19.52
  4. 24.32
  5. 268.8
  6. 2.52
  7. 42.24
  8. 129.5
  9. 7.12
  10. 0.174
  11. 44.1
  12. 1.12
  13. 24.3
  14. 102.4
  15. 5.92
  16. 0.534
  17. 39.9
  18. 1.215
  19. 93.6
  20. 7.29
  21. 4.62
  22. 2.64
  23. 1.12
  24. 2.45
  25. 16.38
  26. 0.52
  27. 9.18
  28. 72.8
  29. 2.16
  30. 63.6
  31. 0.116
  32. 8.12
  33. 0.793
  34. 24.9
  35. 1.32
  36. 0.028
  37. 12.96
  38. 0.504
  39. 12.32
  40. 10.2

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