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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 783 · 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 × 0.6 — where does the decimal point go? (a) 31.2 (b) 0.312 (c) 3.12 (d) 0.0312
  2. 2.4.3 × 0.3 — where does the decimal point go? (a) 0.129 (b) 0.0129 (c) 1.29 (d) 12.9
  3. 3.4.6 × 7 — where does the decimal point go? (a) 3.22 (b) 32.2 (c) 0.322 (d) 322
  4. 4.0.45 × 23 — where does the decimal point go? (a) 1.035 (b) 0.1035 (c) 10.35 (d) 103.5
  5. 5.1.6 × 19 — where does the decimal point go? (a) 0.304 (b) 30.4 (c) 3.04 (d) 304
  6. 6.0.69 × 0.3 — where does the decimal point go? (a) 2.07 (b) 0.0207 (c) 0.00207 (d) 0.207
  7. 7.7.1 × 21 — where does the decimal point go? (a) 149.1 (b) 1491 (c) 14.91 (d) 1.491
  8. 8.0.62 × 1.1 — where does the decimal point go? (a) 0.682 (b) 0.00682 (c) 0.0682 (d) 6.82
  9. 9.0.28 × 26 — where does the decimal point go? (a) 7.28 (b) 0.728 (c) 0.0728 (d) 72.8
  10. 10.8.1 × 35 — where does the decimal point go? (a) 28.35 (b) 2835 (c) 283.5 (d) 2.835
  11. 11.0.23 × 3.7 — where does the decimal point go? (a) 0.00851 (b) 0.0851 (c) 0.851 (d) 8.51
  12. 12.7.1 × 4.7 — where does the decimal point go? (a) 3.337 (b) 0.3337 (c) 33.37 (d) 333.7
  13. 13.1.6 × 8 — where does the decimal point go? (a) 12.8 (b) 1.28 (c) 128 (d) 0.128
  14. 14.0.39 × 6 — where does the decimal point go? (a) 23.4 (b) 0.234 (c) 2.34 (d) 0.0234
  15. 15.0.83 × 2 — where does the decimal point go? (a) 0.0166 (b) 0.166 (c) 16.6 (d) 1.66
  16. 16.0.79 × 9 — where does the decimal point go? (a) 7.11 (b) 0.711 (c) 71.1 (d) 0.0711
  17. 17.5.4 × 1.9 — where does the decimal point go? (a) 10.26 (b) 1.026 (c) 0.1026 (d) 102.6
  18. 18.2.1 × 18 — where does the decimal point go? (a) 3.78 (b) 378 (c) 37.8 (d) 0.378
  19. 19.0.21 × 0.5 — where does the decimal point go? (a) 1.05 (b) 0.00105 (c) 0.105 (d) 0.0105
  20. 20.2.4 × 0.3 — where does the decimal point go? (a) 0.0072 (b) 7.2 (c) 0.072 (d) 0.72
  21. 21.0.28 × 4.2 — where does the decimal point go? (a) 0.1176 (b) 1.176 (c) 11.76 (d) 0.01176
  22. 22.5.5 × 7 — where does the decimal point go? (a) 385 (b) 38.5 (c) 3.85 (d) 0.385
  23. 23.9.7 × 35 — where does the decimal point go? (a) 33.95 (b) 3395 (c) 339.5 (d) 3.395
  24. 24.0.25 × 5 — where does the decimal point go? (a) 1.25 (b) 0.0125 (c) 12.5 (d) 0.125
  25. 25.5.6 × 42 — where does the decimal point go? (a) 2.352 (b) 23.52 (c) 2352 (d) 235.2
  26. 26.0.32 × 2.6 — where does the decimal point go? (a) 8.32 (b) 0.832 (c) 0.00832 (d) 0.0832
  27. 27.3.6 × 4.2 — where does the decimal point go? (a) 15.12 (b) 151.2 (c) 1.512 (d) 0.1512
  28. 28.0.31 × 4.8 — where does the decimal point go? (a) 0.01488 (b) 0.1488 (c) 14.88 (d) 1.488
  29. 29.6.1 × 7 — where does the decimal point go? (a) 4.27 (b) 0.427 (c) 42.7 (d) 427
  30. 30.0.86 × 8 — where does the decimal point go? (a) 0.688 (b) 6.88 (c) 68.8 (d) 0.0688
  31. 31.0.72 × 8 — where does the decimal point go? (a) 0.0576 (b) 5.76 (c) 0.576 (d) 57.6
  32. 32.0.83 × 4.9 — where does the decimal point go? (a) 0.04067 (b) 0.4067 (c) 4.067 (d) 40.67
  33. 33.0.43 × 1.9 — where does the decimal point go? (a) 8.17 (b) 0.0817 (c) 0.817 (d) 0.00817
  34. 34.0.49 × 0.8 — where does the decimal point go? (a) 0.392 (b) 0.0392 (c) 3.92 (d) 0.00392
  35. 35.2.5 × 2.5 — where does the decimal point go? (a) 6.25 (b) 62.5 (c) 0.625 (d) 0.0625
  36. 36.5.6 × 0.3 — where does the decimal point go? (a) 1.68 (b) 16.8 (c) 0.0168 (d) 0.168
  37. 37.0.17 × 25 — where does the decimal point go? (a) 4.25 (b) 0.0425 (c) 42.5 (d) 0.425
  38. 38.0.63 × 0.7 — where does the decimal point go? (a) 0.00441 (b) 0.0441 (c) 0.441 (d) 4.41
  39. 39.0.15 × 17 — where does the decimal point go? (a) 0.255 (b) 2.55 (c) 25.5 (d) 0.0255
  40. 40.0.12 × 0.9 — where does the decimal point go? (a) 0.0108 (b) 0.108 (c) 1.08 (d) 0.00108

Answer key

  1. 3.12
  2. 1.29
  3. 32.2
  4. 10.35
  5. 30.4
  6. 0.207
  7. 149.1
  8. 0.682
  9. 7.28
  10. 283.5
  11. 0.851
  12. 33.37
  13. 12.8
  14. 2.34
  15. 1.66
  16. 7.11
  17. 10.26
  18. 37.8
  19. 0.105
  20. 0.72
  21. 1.176
  22. 38.5
  23. 339.5
  24. 1.25
  25. 235.2
  26. 0.832
  27. 15.12
  28. 1.488
  29. 42.7
  30. 6.88
  31. 5.76
  32. 4.067
  33. 0.817
  34. 0.392
  35. 6.25
  36. 1.68
  37. 4.25
  38. 0.441
  39. 2.55
  40. 0.108

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