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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 551 · 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. 1.0.28 × 0.7 — where does the decimal point go? (a) 1.96 (b) 0.0196 (c) 0.00196 (d) 0.196
  2. 2.2.7 × 0.9 — where does the decimal point go? (a) 0.243 (b) 2.43 (c) 0.0243 (d) 24.3
  3. 3.3.9 × 0.8 — where does the decimal point go? (a) 31.2 (b) 0.312 (c) 0.0312 (d) 3.12
  4. 4.0.45 × 3 — where does the decimal point go? (a) 0.135 (b) 13.5 (c) 0.0135 (d) 1.35
  5. 5.2.1 × 6 — where does the decimal point go? (a) 1.26 (b) 126 (c) 0.126 (d) 12.6
  6. 6.0.56 × 3.7 — where does the decimal point go? (a) 20.72 (b) 0.02072 (c) 2.072 (d) 0.2072
  7. 7.6.7 × 47 — where does the decimal point go? (a) 314.9 (b) 3149 (c) 3.149 (d) 31.49
  8. 8.0.63 × 2 — where does the decimal point go? (a) 0.0126 (b) 0.126 (c) 1.26 (d) 12.6
  9. 9.8.4 × 4 — where does the decimal point go? (a) 3.36 (b) 0.336 (c) 336 (d) 33.6
  10. 10.2.4 × 0.6 — where does the decimal point go? (a) 0.0144 (b) 0.144 (c) 14.4 (d) 1.44
  11. 11.0.78 × 3.7 — where does the decimal point go? (a) 0.2886 (b) 28.86 (c) 0.02886 (d) 2.886
  12. 12.0.72 × 2 — where does the decimal point go? (a) 0.0144 (b) 0.144 (c) 1.44 (d) 14.4
  13. 13.6.9 × 6 — where does the decimal point go? (a) 414 (b) 4.14 (c) 41.4 (d) 0.414
  14. 14.1.8 × 1.8 — where does the decimal point go? (a) 32.4 (b) 0.324 (c) 0.0324 (d) 3.24
  15. 15.0.29 × 11 — where does the decimal point go? (a) 3.19 (b) 0.319 (c) 31.9 (d) 0.0319
  16. 16.0.24 × 0.3 — where does the decimal point go? (a) 0.072 (b) 0.0072 (c) 0.00072 (d) 0.72
  17. 17.7.1 × 1.7 — where does the decimal point go? (a) 0.1207 (b) 12.07 (c) 1.207 (d) 120.7
  18. 18.4.9 × 0.9 — where does the decimal point go? (a) 0.0441 (b) 44.1 (c) 0.441 (d) 4.41
  19. 19.0.97 × 3 — where does the decimal point go? (a) 29.1 (b) 0.0291 (c) 0.291 (d) 2.91
  20. 20.9.8 × 2 — where does the decimal point go? (a) 19.6 (b) 1.96 (c) 0.196 (d) 196
  21. 21.7.1 × 44 — where does the decimal point go? (a) 312.4 (b) 3.124 (c) 3124 (d) 31.24
  22. 22.1.5 × 25 — where does the decimal point go? (a) 0.375 (b) 37.5 (c) 3.75 (d) 375
  23. 23.1.5 × 23 — where does the decimal point go? (a) 34.5 (b) 3.45 (c) 345 (d) 0.345
  24. 24.0.28 × 0.6 — where does the decimal point go? (a) 0.168 (b) 0.0168 (c) 0.00168 (d) 1.68
  25. 25.0.41 × 0.4 — where does the decimal point go? (a) 0.0164 (b) 0.00164 (c) 1.64 (d) 0.164
  26. 26.0.13 × 0.3 — where does the decimal point go? (a) 0.00039 (b) 0.039 (c) 0.0039 (d) 0.39
  27. 27.0.89 × 3.5 — where does the decimal point go? (a) 0.3115 (b) 31.15 (c) 0.03115 (d) 3.115
  28. 28.0.23 × 47 — where does the decimal point go? (a) 108.1 (b) 1.081 (c) 0.1081 (d) 10.81
  29. 29.7.6 × 6 — where does the decimal point go? (a) 45.6 (b) 4.56 (c) 0.456 (d) 456
  30. 30.0.16 × 41 — where does the decimal point go? (a) 0.0656 (b) 65.6 (c) 6.56 (d) 0.656
  31. 31.4.1 × 3.7 — where does the decimal point go? (a) 151.7 (b) 1.517 (c) 15.17 (d) 0.1517
  32. 32.8.9 × 3 — where does the decimal point go? (a) 0.267 (b) 2.67 (c) 267 (d) 26.7
  33. 33.6.4 × 16 — where does the decimal point go? (a) 10.24 (b) 1024 (c) 1.024 (d) 102.4
  34. 34.0.77 × 31 — where does the decimal point go? (a) 238.7 (b) 0.2387 (c) 2.387 (d) 23.87
  35. 35.2.6 × 2.3 — where does the decimal point go? (a) 0.598 (b) 5.98 (c) 0.0598 (d) 59.8
  36. 36.0.36 × 8 — where does the decimal point go? (a) 2.88 (b) 0.0288 (c) 28.8 (d) 0.288
  37. 37.0.96 × 6 — where does the decimal point go? (a) 0.576 (b) 5.76 (c) 0.0576 (d) 57.6
  38. 38.1.9 × 35 — where does the decimal point go? (a) 66.5 (b) 665 (c) 6.65 (d) 0.665
  39. 39.6.8 × 34 — where does the decimal point go? (a) 2312 (b) 231.2 (c) 23.12 (d) 2.312
  40. 40.7.1 × 2 — where does the decimal point go? (a) 0.142 (b) 142 (c) 1.42 (d) 14.2

Answer key

  1. 0.196
  2. 2.43
  3. 3.12
  4. 1.35
  5. 12.6
  6. 2.072
  7. 314.9
  8. 1.26
  9. 33.6
  10. 1.44
  11. 2.886
  12. 1.44
  13. 41.4
  14. 3.24
  15. 3.19
  16. 0.072
  17. 12.07
  18. 4.41
  19. 2.91
  20. 19.6
  21. 312.4
  22. 37.5
  23. 34.5
  24. 0.168
  25. 0.164
  26. 0.039
  27. 3.115
  28. 10.81
  29. 45.6
  30. 6.56
  31. 15.17
  32. 26.7
  33. 102.4
  34. 23.87
  35. 5.98
  36. 2.88
  37. 5.76
  38. 66.5
  39. 231.2
  40. 14.2

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