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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 806 · 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. 1.5.9 × 29 — where does the decimal point go? (a) 171.1 (b) 1.711 (c) 1711 (d) 17.11
  2. 2.8.8 × 4 — where does the decimal point go? (a) 35.2 (b) 3.52 (c) 352 (d) 0.352
  3. 3.4.2 × 36 — where does the decimal point go? (a) 15.12 (b) 1512 (c) 1.512 (d) 151.2
  4. 4.0.61 × 3 — where does the decimal point go? (a) 1.83 (b) 0.0183 (c) 18.3 (d) 0.183
  5. 5.3.5 × 3 — where does the decimal point go? (a) 0.105 (b) 1.05 (c) 105 (d) 10.5
  6. 6.6.1 × 0.8 — where does the decimal point go? (a) 4.88 (b) 48.8 (c) 0.488 (d) 0.0488
  7. 7.0.65 × 0.7 — where does the decimal point go? (a) 0.455 (b) 0.00455 (c) 4.55 (d) 0.0455
  8. 8.0.35 × 29 — where does the decimal point go? (a) 0.1015 (b) 10.15 (c) 101.5 (d) 1.015
  9. 9.7.4 × 0.2 — where does the decimal point go? (a) 0.0148 (b) 14.8 (c) 1.48 (d) 0.148
  10. 10.2.3 × 2 — where does the decimal point go? (a) 4.6 (b) 0.046 (c) 0.46 (d) 46
  11. 11.8.1 × 11 — where does the decimal point go? (a) 8.91 (b) 891 (c) 0.891 (d) 89.1
  12. 12.0.93 × 0.3 — where does the decimal point go? (a) 0.0279 (b) 0.00279 (c) 0.279 (d) 2.79
  13. 13.1.4 × 2.9 — where does the decimal point go? (a) 0.0406 (b) 40.6 (c) 4.06 (d) 0.406
  14. 14.1.2 × 3 — where does the decimal point go? (a) 3.6 (b) 36 (c) 0.36 (d) 0.036
  15. 15.8.6 × 4 — where does the decimal point go? (a) 34.4 (b) 3.44 (c) 344 (d) 0.344
  16. 16.3.7 × 0.9 — where does the decimal point go? (a) 0.0333 (b) 33.3 (c) 3.33 (d) 0.333
  17. 17.0.41 × 27 — where does the decimal point go? (a) 11.07 (b) 110.7 (c) 1.107 (d) 0.1107
  18. 18.0.99 × 3.1 — where does the decimal point go? (a) 0.3069 (b) 0.03069 (c) 3.069 (d) 30.69
  19. 19.6.3 × 1.4 — where does the decimal point go? (a) 88.2 (b) 0.882 (c) 8.82 (d) 0.0882
  20. 20.2.6 × 4.4 — where does the decimal point go? (a) 114.4 (b) 0.1144 (c) 1.144 (d) 11.44
  21. 21.0.93 × 5 — where does the decimal point go? (a) 4.65 (b) 0.0465 (c) 0.465 (d) 46.5
  22. 22.0.79 × 0.4 — where does the decimal point go? (a) 0.00316 (b) 0.0316 (c) 0.316 (d) 3.16
  23. 23.0.31 × 1.9 — where does the decimal point go? (a) 0.589 (b) 0.00589 (c) 5.89 (d) 0.0589
  24. 24.0.43 × 36 — where does the decimal point go? (a) 154.8 (b) 0.1548 (c) 15.48 (d) 1.548
  25. 25.0.84 × 6 — where does the decimal point go? (a) 0.0504 (b) 5.04 (c) 0.504 (d) 50.4
  26. 26.1.7 × 43 — where does the decimal point go? (a) 7.31 (b) 73.1 (c) 0.731 (d) 731
  27. 27.0.55 × 3 — where does the decimal point go? (a) 0.165 (b) 16.5 (c) 1.65 (d) 0.0165
  28. 28.5.6 × 8 — where does the decimal point go? (a) 4.48 (b) 44.8 (c) 448 (d) 0.448
  29. 29.0.75 × 3 — where does the decimal point go? (a) 2.25 (b) 0.225 (c) 0.0225 (d) 22.5
  30. 30.3.2 × 0.3 — where does the decimal point go? (a) 0.96 (b) 0.0096 (c) 9.6 (d) 0.096
  31. 31.5.7 × 1.8 — where does the decimal point go? (a) 1.026 (b) 0.1026 (c) 10.26 (d) 102.6
  32. 32.8.7 × 1.8 — where does the decimal point go? (a) 1.566 (b) 0.1566 (c) 15.66 (d) 156.6
  33. 33.8.6 × 0.8 — where does the decimal point go? (a) 0.0688 (b) 0.688 (c) 68.8 (d) 6.88
  34. 34.3.7 × 2.4 — where does the decimal point go? (a) 8.88 (b) 0.888 (c) 0.0888 (d) 88.8
  35. 35.5.8 × 44 — where does the decimal point go? (a) 25.52 (b) 255.2 (c) 2552 (d) 2.552
  36. 36.0.61 × 4.7 — where does the decimal point go? (a) 2.867 (b) 28.67 (c) 0.02867 (d) 0.2867
  37. 37.3.6 × 0.2 — where does the decimal point go? (a) 0.072 (b) 0.72 (c) 0.0072 (d) 7.2
  38. 38.1.9 × 2.6 — where does the decimal point go? (a) 0.0494 (b) 4.94 (c) 0.494 (d) 49.4
  39. 39.9.4 × 1.4 — where does the decimal point go? (a) 131.6 (b) 0.1316 (c) 1.316 (d) 13.16
  40. 40.6.4 × 2 — where does the decimal point go? (a) 128 (b) 0.128 (c) 1.28 (d) 12.8

Answer key

  1. 171.1
  2. 35.2
  3. 151.2
  4. 1.83
  5. 10.5
  6. 4.88
  7. 0.455
  8. 10.15
  9. 1.48
  10. 4.6
  11. 89.1
  12. 0.279
  13. 4.06
  14. 3.6
  15. 34.4
  16. 3.33
  17. 11.07
  18. 3.069
  19. 8.82
  20. 11.44
  21. 4.65
  22. 0.316
  23. 0.589
  24. 15.48
  25. 5.04
  26. 73.1
  27. 1.65
  28. 44.8
  29. 2.25
  30. 0.96
  31. 10.26
  32. 15.66
  33. 6.88
  34. 8.88
  35. 255.2
  36. 2.867
  37. 0.72
  38. 4.94
  39. 13.16
  40. 12.8

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