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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 310 · 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. 1.0.69 × 15 — where does the decimal point go? (a) 0.1035 (b) 10.35 (c) 103.5 (d) 1.035
  2. 2.0.91 × 3.4 — where does the decimal point go? (a) 30.94 (b) 0.03094 (c) 0.3094 (d) 3.094
  3. 3.6.1 × 41 — where does the decimal point go? (a) 250.1 (b) 25.01 (c) 2501 (d) 2.501
  4. 4.0.52 × 0.4 — where does the decimal point go? (a) 0.208 (b) 0.0208 (c) 0.00208 (d) 2.08
  5. 5.0.89 × 7 — where does the decimal point go? (a) 0.0623 (b) 62.3 (c) 6.23 (d) 0.623
  6. 6.9.3 × 6 — where does the decimal point go? (a) 0.558 (b) 5.58 (c) 558 (d) 55.8
  7. 7.4.2 × 3 — where does the decimal point go? (a) 12.6 (b) 126 (c) 0.126 (d) 1.26
  8. 8.7.8 × 6 — where does the decimal point go? (a) 0.468 (b) 4.68 (c) 468 (d) 46.8
  9. 9.2.9 × 5 — where does the decimal point go? (a) 14.5 (b) 1.45 (c) 145 (d) 0.145
  10. 10.0.57 × 2.7 — where does the decimal point go? (a) 0.01539 (b) 15.39 (c) 1.539 (d) 0.1539
  11. 11.5.8 × 37 — where does the decimal point go? (a) 21.46 (b) 2.146 (c) 2146 (d) 214.6
  12. 12.0.56 × 37 — where does the decimal point go? (a) 20.72 (b) 2.072 (c) 0.2072 (d) 207.2
  13. 13.6.7 × 0.9 — where does the decimal point go? (a) 6.03 (b) 0.0603 (c) 60.3 (d) 0.603
  14. 14.1.9 × 0.9 — where does the decimal point go? (a) 17.1 (b) 0.171 (c) 1.71 (d) 0.0171
  15. 15.3.7 × 3 — where does the decimal point go? (a) 1.11 (b) 0.111 (c) 11.1 (d) 111
  16. 16.7.1 × 5 — where does the decimal point go? (a) 35.5 (b) 0.355 (c) 3.55 (d) 355
  17. 17.0.12 × 7 — where does the decimal point go? (a) 0.84 (b) 0.0084 (c) 8.4 (d) 0.084
  18. 18.5.3 × 2 — where does the decimal point go? (a) 106 (b) 0.106 (c) 1.06 (d) 10.6
  19. 19.3.4 × 0.9 — where does the decimal point go? (a) 30.6 (b) 3.06 (c) 0.0306 (d) 0.306
  20. 20.0.96 × 0.8 — where does the decimal point go? (a) 0.00768 (b) 0.0768 (c) 0.768 (d) 7.68
  21. 21.9.7 × 4 — where does the decimal point go? (a) 3.88 (b) 388 (c) 38.8 (d) 0.388
  22. 22.0.79 × 5 — where does the decimal point go? (a) 0.395 (b) 39.5 (c) 3.95 (d) 0.0395
  23. 23.1.9 × 7 — where does the decimal point go? (a) 0.133 (b) 1.33 (c) 13.3 (d) 133
  24. 24.0.67 × 2 — where does the decimal point go? (a) 0.134 (b) 0.0134 (c) 13.4 (d) 1.34
  25. 25.9.4 × 1.1 — where does the decimal point go? (a) 103.4 (b) 1.034 (c) 10.34 (d) 0.1034
  26. 26.3.6 × 3.6 — where does the decimal point go? (a) 0.1296 (b) 129.6 (c) 1.296 (d) 12.96
  27. 27.0.19 × 3.4 — where does the decimal point go? (a) 0.0646 (b) 6.46 (c) 0.00646 (d) 0.646
  28. 28.3.1 × 0.3 — where does the decimal point go? (a) 9.3 (b) 0.0093 (c) 0.93 (d) 0.093
  29. 29.0.36 × 3.4 — where does the decimal point go? (a) 0.1224 (b) 12.24 (c) 1.224 (d) 0.01224
  30. 30.3.7 × 4.7 — where does the decimal point go? (a) 17.39 (b) 0.1739 (c) 173.9 (d) 1.739
  31. 31.0.14 × 2.8 — where does the decimal point go? (a) 0.392 (b) 0.00392 (c) 0.0392 (d) 3.92
  32. 32.2.3 × 5 — where does the decimal point go? (a) 11.5 (b) 1.15 (c) 115 (d) 0.115
  33. 33.4.7 × 6 — where does the decimal point go? (a) 282 (b) 0.282 (c) 2.82 (d) 28.2
  34. 34.0.79 × 1.8 — where does the decimal point go? (a) 0.01422 (b) 14.22 (c) 1.422 (d) 0.1422
  35. 35.3.3 × 29 — where does the decimal point go? (a) 9.57 (b) 95.7 (c) 0.957 (d) 957
  36. 36.0.35 × 7 — where does the decimal point go? (a) 0.245 (b) 0.0245 (c) 24.5 (d) 2.45
  37. 37.7.7 × 3 — where does the decimal point go? (a) 23.1 (b) 231 (c) 0.231 (d) 2.31
  38. 38.1.7 × 0.9 — where does the decimal point go? (a) 1.53 (b) 0.0153 (c) 0.153 (d) 15.3
  39. 39.2.3 × 4 — where does the decimal point go? (a) 0.92 (b) 92 (c) 9.2 (d) 0.092
  40. 40.0.28 × 3.4 — where does the decimal point go? (a) 9.52 (b) 0.952 (c) 0.00952 (d) 0.0952

Answer key

  1. 10.35
  2. 3.094
  3. 250.1
  4. 0.208
  5. 6.23
  6. 55.8
  7. 12.6
  8. 46.8
  9. 14.5
  10. 1.539
  11. 214.6
  12. 20.72
  13. 6.03
  14. 1.71
  15. 11.1
  16. 35.5
  17. 0.84
  18. 10.6
  19. 3.06
  20. 0.768
  21. 38.8
  22. 3.95
  23. 13.3
  24. 1.34
  25. 10.34
  26. 12.96
  27. 0.646
  28. 0.93
  29. 1.224
  30. 17.39
  31. 0.392
  32. 11.5
  33. 28.2
  34. 1.422
  35. 95.7
  36. 2.45
  37. 23.1
  38. 1.53
  39. 9.2
  40. 0.952

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