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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 293 · 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. 1.5.2 × 4 — where does the decimal point go? (a) 2.08 (b) 208 (c) 0.208 (d) 20.8
  2. 2.8.1 × 5 — where does the decimal point go? (a) 405 (b) 40.5 (c) 4.05 (d) 0.405
  3. 3.0.94 × 2.2 — where does the decimal point go? (a) 0.2068 (b) 20.68 (c) 2.068 (d) 0.02068
  4. 4.0.32 × 9 — where does the decimal point go? (a) 28.8 (b) 0.0288 (c) 0.288 (d) 2.88
  5. 5.3.3 × 3 — where does the decimal point go? (a) 9.9 (b) 0.099 (c) 0.99 (d) 99
  6. 6.0.89 × 2 — where does the decimal point go? (a) 0.0178 (b) 1.78 (c) 17.8 (d) 0.178
  7. 7.2.3 × 44 — where does the decimal point go? (a) 1.012 (b) 101.2 (c) 1012 (d) 10.12
  8. 8.7.3 × 8 — where does the decimal point go? (a) 58.4 (b) 5.84 (c) 0.584 (d) 584
  9. 9.0.86 × 0.6 — where does the decimal point go? (a) 5.16 (b) 0.516 (c) 0.0516 (d) 0.00516
  10. 10.5.8 × 0.7 — where does the decimal point go? (a) 0.0406 (b) 4.06 (c) 40.6 (d) 0.406
  11. 11.5.1 × 47 — where does the decimal point go? (a) 2397 (b) 2.397 (c) 239.7 (d) 23.97
  12. 12.2.3 × 0.7 — where does the decimal point go? (a) 0.161 (b) 16.1 (c) 1.61 (d) 0.0161
  13. 13.0.23 × 19 — where does the decimal point go? (a) 0.0437 (b) 43.7 (c) 0.437 (d) 4.37
  14. 14.9.8 × 9 — where does the decimal point go? (a) 8.82 (b) 882 (c) 0.882 (d) 88.2
  15. 15.0.96 × 2 — where does the decimal point go? (a) 1.92 (b) 0.0192 (c) 0.192 (d) 19.2
  16. 16.0.58 × 8 — where does the decimal point go? (a) 0.464 (b) 0.0464 (c) 46.4 (d) 4.64
  17. 17.3.2 × 3 — where does the decimal point go? (a) 96 (b) 0.96 (c) 0.096 (d) 9.6
  18. 18.1.2 × 2.2 — where does the decimal point go? (a) 26.4 (b) 0.264 (c) 2.64 (d) 0.0264
  19. 19.7.1 × 49 — where does the decimal point go? (a) 34.79 (b) 347.9 (c) 3479 (d) 3.479
  20. 20.1.6 × 3 — where does the decimal point go? (a) 48 (b) 0.48 (c) 4.8 (d) 0.048
  21. 21.8.1 × 0.6 — where does the decimal point go? (a) 0.0486 (b) 4.86 (c) 0.486 (d) 48.6
  22. 22.0.51 × 2.1 — where does the decimal point go? (a) 0.01071 (b) 1.071 (c) 0.1071 (d) 10.71
  23. 23.4.2 × 2.2 — where does the decimal point go? (a) 92.4 (b) 0.0924 (c) 0.924 (d) 9.24
  24. 24.0.46 × 13 — where does the decimal point go? (a) 0.0598 (b) 59.8 (c) 0.598 (d) 5.98
  25. 25.0.94 × 2.1 — where does the decimal point go? (a) 1.974 (b) 0.1974 (c) 19.74 (d) 0.01974
  26. 26.3.5 × 0.3 — where does the decimal point go? (a) 10.5 (b) 1.05 (c) 0.105 (d) 0.0105
  27. 27.0.78 × 24 — where does the decimal point go? (a) 187.2 (b) 1.872 (c) 18.72 (d) 0.1872
  28. 28.0.86 × 32 — where does the decimal point go? (a) 275.2 (b) 27.52 (c) 2.752 (d) 0.2752
  29. 29.8.9 × 3 — where does the decimal point go? (a) 0.267 (b) 2.67 (c) 267 (d) 26.7
  30. 30.0.42 × 9 — where does the decimal point go? (a) 3.78 (b) 0.378 (c) 0.0378 (d) 37.8
  31. 31.8.4 × 2.3 — where does the decimal point go? (a) 1.932 (b) 0.1932 (c) 19.32 (d) 193.2
  32. 32.2.2 × 4 — where does the decimal point go? (a) 0.088 (b) 0.88 (c) 8.8 (d) 88
  33. 33.0.61 × 39 — where does the decimal point go? (a) 237.9 (b) 0.2379 (c) 23.79 (d) 2.379
  34. 34.3.1 × 4.6 — where does the decimal point go? (a) 142.6 (b) 1.426 (c) 0.1426 (d) 14.26
  35. 35.0.62 × 0.8 — where does the decimal point go? (a) 0.00496 (b) 0.0496 (c) 4.96 (d) 0.496
  36. 36.9.1 × 36 — where does the decimal point go? (a) 327.6 (b) 32.76 (c) 3276 (d) 3.276
  37. 37.2.1 × 4.9 — where does the decimal point go? (a) 0.1029 (b) 10.29 (c) 1.029 (d) 102.9
  38. 38.7.9 × 21 — where does the decimal point go? (a) 165.9 (b) 1.659 (c) 1659 (d) 16.59
  39. 39.0.59 × 9 — where does the decimal point go? (a) 0.531 (b) 5.31 (c) 0.0531 (d) 53.1
  40. 40.5.9 × 1.1 — where does the decimal point go? (a) 0.649 (b) 0.0649 (c) 64.9 (d) 6.49

Answer key

  1. 20.8
  2. 40.5
  3. 2.068
  4. 2.88
  5. 9.9
  6. 1.78
  7. 101.2
  8. 58.4
  9. 0.516
  10. 4.06
  11. 239.7
  12. 1.61
  13. 4.37
  14. 88.2
  15. 1.92
  16. 4.64
  17. 9.6
  18. 2.64
  19. 347.9
  20. 4.8
  21. 4.86
  22. 1.071
  23. 9.24
  24. 5.98
  25. 1.974
  26. 1.05
  27. 18.72
  28. 27.52
  29. 26.7
  30. 3.78
  31. 19.32
  32. 8.8
  33. 23.79
  34. 14.26
  35. 0.496
  36. 327.6
  37. 10.29
  38. 165.9
  39. 5.31
  40. 6.49

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