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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 751 · 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. 1.8.7 × 42 — where does the decimal point go? (a) 365.4 (b) 3.654 (c) 36.54 (d) 3654
  2. 2.1.2 × 8 — where does the decimal point go? (a) 0.096 (b) 96 (c) 9.6 (d) 0.96
  3. 3.7.7 × 2.9 — where does the decimal point go? (a) 22.33 (b) 0.2233 (c) 223.3 (d) 2.233
  4. 4.4.7 × 0.2 — where does the decimal point go? (a) 0.94 (b) 0.0094 (c) 9.4 (d) 0.094
  5. 5.6.7 × 0.7 — where does the decimal point go? (a) 4.69 (b) 0.469 (c) 46.9 (d) 0.0469
  6. 6.0.21 × 0.7 — where does the decimal point go? (a) 0.00147 (b) 1.47 (c) 0.147 (d) 0.0147
  7. 7.0.12 × 0.9 — where does the decimal point go? (a) 1.08 (b) 0.108 (c) 0.00108 (d) 0.0108
  8. 8.0.73 × 5 — where does the decimal point go? (a) 3.65 (b) 36.5 (c) 0.0365 (d) 0.365
  9. 9.0.54 × 0.6 — where does the decimal point go? (a) 0.324 (b) 3.24 (c) 0.0324 (d) 0.00324
  10. 10.8.9 × 1.6 — where does the decimal point go? (a) 0.1424 (b) 1.424 (c) 14.24 (d) 142.4
  11. 11.1.6 × 4.2 — where does the decimal point go? (a) 0.672 (b) 67.2 (c) 6.72 (d) 0.0672
  12. 12.0.34 × 2.1 — where does the decimal point go? (a) 0.00714 (b) 0.714 (c) 0.0714 (d) 7.14
  13. 13.1.9 × 47 — where does the decimal point go? (a) 0.893 (b) 89.3 (c) 893 (d) 8.93
  14. 14.8.3 × 0.7 — where does the decimal point go? (a) 0.0581 (b) 5.81 (c) 58.1 (d) 0.581
  15. 15.7.2 × 2 — where does the decimal point go? (a) 1.44 (b) 144 (c) 0.144 (d) 14.4
  16. 16.0.44 × 3 — where does the decimal point go? (a) 0.0132 (b) 1.32 (c) 13.2 (d) 0.132
  17. 17.0.64 × 0.3 — where does the decimal point go? (a) 1.92 (b) 0.192 (c) 0.00192 (d) 0.0192
  18. 18.0.15 × 0.5 — where does the decimal point go? (a) 0.075 (b) 0.75 (c) 0.00075 (d) 0.0075
  19. 19.4.4 × 0.3 — where does the decimal point go? (a) 1.32 (b) 0.0132 (c) 0.132 (d) 13.2
  20. 20.0.73 × 6 — where does the decimal point go? (a) 43.8 (b) 0.0438 (c) 4.38 (d) 0.438
  21. 21.0.57 × 26 — where does the decimal point go? (a) 1.482 (b) 14.82 (c) 0.1482 (d) 148.2
  22. 22.3.8 × 2.1 — where does the decimal point go? (a) 0.0798 (b) 0.798 (c) 79.8 (d) 7.98
  23. 23.0.23 × 9 — where does the decimal point go? (a) 0.0207 (b) 2.07 (c) 20.7 (d) 0.207
  24. 24.0.29 × 2 — where does the decimal point go? (a) 0.58 (b) 0.058 (c) 5.8 (d) 0.0058
  25. 25.0.53 × 3.8 — where does the decimal point go? (a) 20.14 (b) 2.014 (c) 0.2014 (d) 0.02014
  26. 26.2.6 × 3 — where does the decimal point go? (a) 7.8 (b) 0.078 (c) 78 (d) 0.78
  27. 27.0.99 × 0.4 — where does the decimal point go? (a) 0.0396 (b) 0.00396 (c) 0.396 (d) 3.96
  28. 28.7.8 × 1.8 — where does the decimal point go? (a) 14.04 (b) 0.1404 (c) 140.4 (d) 1.404
  29. 29.0.99 × 3.7 — where does the decimal point go? (a) 3.663 (b) 0.3663 (c) 0.03663 (d) 36.63
  30. 30.4.4 × 16 — where does the decimal point go? (a) 70.4 (b) 0.704 (c) 7.04 (d) 704
  31. 31.9.1 × 7 — where does the decimal point go? (a) 637 (b) 6.37 (c) 0.637 (d) 63.7
  32. 32.0.86 × 1.7 — where does the decimal point go? (a) 1.462 (b) 0.1462 (c) 14.62 (d) 0.01462
  33. 33.0.24 × 39 — where does the decimal point go? (a) 93.6 (b) 0.936 (c) 0.0936 (d) 9.36
  34. 34.0.29 × 0.8 — where does the decimal point go? (a) 0.232 (b) 0.00232 (c) 2.32 (d) 0.0232
  35. 35.5.9 × 5 — where does the decimal point go? (a) 29.5 (b) 2.95 (c) 0.295 (d) 295
  36. 36.4.9 × 7 — where does the decimal point go? (a) 34.3 (b) 0.343 (c) 343 (d) 3.43
  37. 37.1.6 × 42 — where does the decimal point go? (a) 0.672 (b) 6.72 (c) 672 (d) 67.2
  38. 38.1.6 × 0.6 — where does the decimal point go? (a) 9.6 (b) 0.0096 (c) 0.96 (d) 0.096
  39. 39.0.79 × 5 — where does the decimal point go? (a) 0.0395 (b) 39.5 (c) 3.95 (d) 0.395
  40. 40.9.4 × 2.2 — where does the decimal point go? (a) 0.2068 (b) 206.8 (c) 2.068 (d) 20.68

Answer key

  1. 365.4
  2. 9.6
  3. 22.33
  4. 0.94
  5. 4.69
  6. 0.147
  7. 0.108
  8. 3.65
  9. 0.324
  10. 14.24
  11. 6.72
  12. 0.714
  13. 89.3
  14. 5.81
  15. 14.4
  16. 1.32
  17. 0.192
  18. 0.075
  19. 1.32
  20. 4.38
  21. 14.82
  22. 7.98
  23. 2.07
  24. 0.58
  25. 2.014
  26. 7.8
  27. 0.396
  28. 14.04
  29. 3.663
  30. 70.4
  31. 63.7
  32. 1.462
  33. 9.36
  34. 0.232
  35. 29.5
  36. 34.3
  37. 67.2
  38. 0.96
  39. 3.95
  40. 20.68

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