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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 717 · 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. 1.0.18 × 13 — where does the decimal point go? (a) 0.234 (b) 23.4 (c) 2.34 (d) 0.0234
  2. 2.0.22 × 0.4 — where does the decimal point go? (a) 0.88 (b) 0.0088 (c) 0.00088 (d) 0.088
  3. 3.1.9 × 3.4 — where does the decimal point go? (a) 0.646 (b) 0.0646 (c) 64.6 (d) 6.46
  4. 4.0.87 × 1.3 — where does the decimal point go? (a) 11.31 (b) 0.1131 (c) 1.131 (d) 0.01131
  5. 5.0.36 × 1.4 — where does the decimal point go? (a) 5.04 (b) 0.00504 (c) 0.0504 (d) 0.504
  6. 6.5.4 × 0.9 — where does the decimal point go? (a) 48.6 (b) 0.486 (c) 0.0486 (d) 4.86
  7. 7.6.9 × 45 — where does the decimal point go? (a) 31.05 (b) 3.105 (c) 310.5 (d) 3105
  8. 8.0.47 × 21 — where does the decimal point go? (a) 0.0987 (b) 98.7 (c) 9.87 (d) 0.987
  9. 9.0.93 × 6 — where does the decimal point go? (a) 55.8 (b) 0.558 (c) 5.58 (d) 0.0558
  10. 10.0.51 × 7 — where does the decimal point go? (a) 0.357 (b) 0.0357 (c) 3.57 (d) 35.7
  11. 11.0.99 × 0.6 — where does the decimal point go? (a) 0.594 (b) 5.94 (c) 0.0594 (d) 0.00594
  12. 12.0.72 × 3 — where does the decimal point go? (a) 2.16 (b) 0.0216 (c) 21.6 (d) 0.216
  13. 13.6.4 × 3 — where does the decimal point go? (a) 192 (b) 19.2 (c) 0.192 (d) 1.92
  14. 14.9.4 × 2.9 — where does the decimal point go? (a) 2.726 (b) 0.2726 (c) 27.26 (d) 272.6
  15. 15.0.42 × 1.9 — where does the decimal point go? (a) 0.798 (b) 0.0798 (c) 7.98 (d) 0.00798
  16. 16.0.77 × 0.5 — where does the decimal point go? (a) 3.85 (b) 0.00385 (c) 0.385 (d) 0.0385
  17. 17.8.3 × 4 — where does the decimal point go? (a) 332 (b) 0.332 (c) 3.32 (d) 33.2
  18. 18.0.97 × 0.2 — where does the decimal point go? (a) 0.0194 (b) 1.94 (c) 0.00194 (d) 0.194
  19. 19.0.12 × 48 — where does the decimal point go? (a) 57.6 (b) 0.0576 (c) 0.576 (d) 5.76
  20. 20.3.9 × 8 — where does the decimal point go? (a) 0.312 (b) 31.2 (c) 312 (d) 3.12
  21. 21.0.84 × 19 — where does the decimal point go? (a) 0.1596 (b) 15.96 (c) 159.6 (d) 1.596
  22. 22.9.2 × 1.1 — where does the decimal point go? (a) 0.1012 (b) 1.012 (c) 10.12 (d) 101.2
  23. 23.3.1 × 8 — where does the decimal point go? (a) 0.248 (b) 2.48 (c) 24.8 (d) 248
  24. 24.8.1 × 6 — where does the decimal point go? (a) 4.86 (b) 48.6 (c) 486 (d) 0.486
  25. 25.8.3 × 42 — where does the decimal point go? (a) 34.86 (b) 348.6 (c) 3.486 (d) 3486
  26. 26.1.7 × 6 — where does the decimal point go? (a) 1.02 (b) 10.2 (c) 0.102 (d) 102
  27. 27.0.72 × 2.9 — where does the decimal point go? (a) 0.02088 (b) 20.88 (c) 2.088 (d) 0.2088
  28. 28.5.1 × 9 — where does the decimal point go? (a) 45.9 (b) 459 (c) 4.59 (d) 0.459
  29. 29.0.78 × 8 — where does the decimal point go? (a) 62.4 (b) 0.0624 (c) 0.624 (d) 6.24
  30. 30.8.4 × 31 — where does the decimal point go? (a) 26.04 (b) 260.4 (c) 2604 (d) 2.604
  31. 31.0.71 × 1.2 — where does the decimal point go? (a) 0.0852 (b) 8.52 (c) 0.852 (d) 0.00852
  32. 32.7.2 × 29 — where does the decimal point go? (a) 2088 (b) 2.088 (c) 20.88 (d) 208.8
  33. 33.0.45 × 0.9 — where does the decimal point go? (a) 0.405 (b) 0.0405 (c) 0.00405 (d) 4.05
  34. 34.6.9 × 5 — where does the decimal point go? (a) 345 (b) 3.45 (c) 34.5 (d) 0.345
  35. 35.2.1 × 24 — where does the decimal point go? (a) 504 (b) 0.504 (c) 50.4 (d) 5.04
  36. 36.5.1 × 2.1 — where does the decimal point go? (a) 1.071 (b) 107.1 (c) 10.71 (d) 0.1071
  37. 37.2.4 × 4 — where does the decimal point go? (a) 96 (b) 0.096 (c) 0.96 (d) 9.6
  38. 38.4.2 × 4.8 — where does the decimal point go? (a) 0.2016 (b) 201.6 (c) 2.016 (d) 20.16
  39. 39.4.4 × 0.2 — where does the decimal point go? (a) 0.0088 (b) 0.088 (c) 0.88 (d) 8.8
  40. 40.0.85 × 0.5 — where does the decimal point go? (a) 4.25 (b) 0.00425 (c) 0.0425 (d) 0.425

Answer key

  1. 2.34
  2. 0.088
  3. 6.46
  4. 1.131
  5. 0.504
  6. 4.86
  7. 310.5
  8. 9.87
  9. 5.58
  10. 3.57
  11. 0.594
  12. 2.16
  13. 19.2
  14. 27.26
  15. 0.798
  16. 0.385
  17. 33.2
  18. 0.194
  19. 5.76
  20. 31.2
  21. 15.96
  22. 10.12
  23. 24.8
  24. 48.6
  25. 348.6
  26. 10.2
  27. 2.088
  28. 45.9
  29. 6.24
  30. 260.4
  31. 0.852
  32. 208.8
  33. 0.405
  34. 34.5
  35. 50.4
  36. 10.71
  37. 9.6
  38. 20.16
  39. 0.88
  40. 0.425

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