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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 89 · 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. 1.8.4 × 0.8 — where does the decimal point go? (a) 6.72 (b) 0.672 (c) 67.2 (d) 0.0672
  2. 2.1.9 × 4 — where does the decimal point go? (a) 0.76 (b) 76 (c) 7.6 (d) 0.076
  3. 3.0.32 × 11 — where does the decimal point go? (a) 0.352 (b) 0.0352 (c) 35.2 (d) 3.52
  4. 4.3.8 × 2 — where does the decimal point go? (a) 7.6 (b) 0.076 (c) 0.76 (d) 76
  5. 5.7.4 × 22 — where does the decimal point go? (a) 16.28 (b) 1.628 (c) 1628 (d) 162.8
  6. 6.1.2 × 4.3 — where does the decimal point go? (a) 0.0516 (b) 5.16 (c) 0.516 (d) 51.6
  7. 7.1.6 × 12 — where does the decimal point go? (a) 0.192 (b) 192 (c) 19.2 (d) 1.92
  8. 8.9.8 × 34 — where does the decimal point go? (a) 333.2 (b) 3332 (c) 3.332 (d) 33.32
  9. 9.2.4 × 1.8 — where does the decimal point go? (a) 0.0432 (b) 43.2 (c) 4.32 (d) 0.432
  10. 10.6.8 × 0.4 — where does the decimal point go? (a) 2.72 (b) 27.2 (c) 0.0272 (d) 0.272
  11. 11.2.2 × 29 — where does the decimal point go? (a) 638 (b) 6.38 (c) 63.8 (d) 0.638
  12. 12.0.16 × 0.3 — where does the decimal point go? (a) 0.048 (b) 0.48 (c) 0.00048 (d) 0.0048
  13. 13.5.3 × 33 — where does the decimal point go? (a) 174.9 (b) 1749 (c) 1.749 (d) 17.49
  14. 14.5.8 × 3 — where does the decimal point go? (a) 0.174 (b) 1.74 (c) 174 (d) 17.4
  15. 15.0.63 × 46 — where does the decimal point go? (a) 0.2898 (b) 2.898 (c) 289.8 (d) 28.98
  16. 16.0.62 × 16 — where does the decimal point go? (a) 0.992 (b) 9.92 (c) 99.2 (d) 0.0992
  17. 17.3.1 × 5 — where does the decimal point go? (a) 0.155 (b) 15.5 (c) 1.55 (d) 155
  18. 18.0.63 × 15 — where does the decimal point go? (a) 0.945 (b) 9.45 (c) 94.5 (d) 0.0945
  19. 19.0.23 × 47 — where does the decimal point go? (a) 10.81 (b) 1.081 (c) 0.1081 (d) 108.1
  20. 20.8.2 × 12 — where does the decimal point go? (a) 9.84 (b) 984 (c) 98.4 (d) 0.984
  21. 21.0.66 × 6 — where does the decimal point go? (a) 0.396 (b) 0.0396 (c) 3.96 (d) 39.6
  22. 22.1.6 × 38 — where does the decimal point go? (a) 60.8 (b) 0.608 (c) 6.08 (d) 608
  23. 23.0.64 × 0.7 — where does the decimal point go? (a) 0.0448 (b) 0.00448 (c) 0.448 (d) 4.48
  24. 24.0.31 × 0.6 — where does the decimal point go? (a) 1.86 (b) 0.0186 (c) 0.00186 (d) 0.186
  25. 25.0.55 × 0.3 — where does the decimal point go? (a) 0.0165 (b) 0.165 (c) 0.00165 (d) 1.65
  26. 26.9.2 × 0.6 — where does the decimal point go? (a) 0.552 (b) 55.2 (c) 0.0552 (d) 5.52
  27. 27.8.6 × 0.8 — where does the decimal point go? (a) 0.0688 (b) 68.8 (c) 0.688 (d) 6.88
  28. 28.4.3 × 3.1 — where does the decimal point go? (a) 1.333 (b) 13.33 (c) 0.1333 (d) 133.3
  29. 29.8.8 × 9 — where does the decimal point go? (a) 0.792 (b) 79.2 (c) 7.92 (d) 792
  30. 30.5.5 × 3 — where does the decimal point go? (a) 0.165 (b) 165 (c) 1.65 (d) 16.5
  31. 31.6.3 × 4 — where does the decimal point go? (a) 2.52 (b) 0.252 (c) 25.2 (d) 252
  32. 32.2.9 × 0.2 — where does the decimal point go? (a) 5.8 (b) 0.0058 (c) 0.58 (d) 0.058
  33. 33.3.1 × 33 — where does the decimal point go? (a) 10.23 (b) 1023 (c) 1.023 (d) 102.3
  34. 34.8.1 × 1.9 — where does the decimal point go? (a) 15.39 (b) 0.1539 (c) 153.9 (d) 1.539
  35. 35.0.69 × 0.7 — where does the decimal point go? (a) 0.0483 (b) 4.83 (c) 0.00483 (d) 0.483
  36. 36.0.18 × 29 — where does the decimal point go? (a) 0.0522 (b) 5.22 (c) 52.2 (d) 0.522
  37. 37.0.98 × 1.1 — where does the decimal point go? (a) 0.01078 (b) 10.78 (c) 0.1078 (d) 1.078
  38. 38.0.25 × 27 — where does the decimal point go? (a) 6.75 (b) 0.0675 (c) 0.675 (d) 67.5
  39. 39.3.9 × 8 — where does the decimal point go? (a) 3.12 (b) 312 (c) 0.312 (d) 31.2
  40. 40.0.37 × 0.6 — where does the decimal point go? (a) 0.222 (b) 0.00222 (c) 2.22 (d) 0.0222

Answer key

  1. 6.72
  2. 7.6
  3. 3.52
  4. 7.6
  5. 162.8
  6. 5.16
  7. 19.2
  8. 333.2
  9. 4.32
  10. 2.72
  11. 63.8
  12. 0.048
  13. 174.9
  14. 17.4
  15. 28.98
  16. 9.92
  17. 15.5
  18. 9.45
  19. 10.81
  20. 98.4
  21. 3.96
  22. 60.8
  23. 0.448
  24. 0.186
  25. 0.165
  26. 5.52
  27. 6.88
  28. 13.33
  29. 79.2
  30. 16.5
  31. 25.2
  32. 0.58
  33. 102.3
  34. 15.39
  35. 0.483
  36. 5.22
  37. 1.078
  38. 6.75
  39. 31.2
  40. 0.222

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