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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 517 · 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. 1.8.5 × 25 — where does the decimal point go? (a) 212.5 (b) 21.25 (c) 2125 (d) 2.125
  2. 2.0.69 × 7 — where does the decimal point go? (a) 0.0483 (b) 4.83 (c) 48.3 (d) 0.483
  3. 3.2.8 × 9 — where does the decimal point go? (a) 25.2 (b) 2.52 (c) 0.252 (d) 252
  4. 4.4.8 × 0.9 — where does the decimal point go? (a) 43.2 (b) 0.0432 (c) 4.32 (d) 0.432
  5. 5.5.9 × 1.5 — where does the decimal point go? (a) 0.885 (b) 8.85 (c) 88.5 (d) 0.0885
  6. 6.0.56 × 6 — where does the decimal point go? (a) 0.336 (b) 3.36 (c) 0.0336 (d) 33.6
  7. 7.0.23 × 2.8 — where does the decimal point go? (a) 0.00644 (b) 0.0644 (c) 6.44 (d) 0.644
  8. 8.2.1 × 0.2 — where does the decimal point go? (a) 0.0042 (b) 4.2 (c) 0.42 (d) 0.042
  9. 9.0.31 × 6 — where does the decimal point go? (a) 1.86 (b) 0.0186 (c) 0.186 (d) 18.6
  10. 10.7.4 × 29 — where does the decimal point go? (a) 2.146 (b) 2146 (c) 214.6 (d) 21.46
  11. 11.0.13 × 0.7 — where does the decimal point go? (a) 0.091 (b) 0.91 (c) 0.0091 (d) 0.00091
  12. 12.6.1 × 0.5 — where does the decimal point go? (a) 3.05 (b) 30.5 (c) 0.0305 (d) 0.305
  13. 13.0.97 × 45 — where does the decimal point go? (a) 0.4365 (b) 43.65 (c) 4.365 (d) 436.5
  14. 14.1.8 × 33 — where does the decimal point go? (a) 0.594 (b) 5.94 (c) 594 (d) 59.4
  15. 15.0.74 × 0.3 — where does the decimal point go? (a) 2.22 (b) 0.222 (c) 0.0222 (d) 0.00222
  16. 16.2.1 × 0.6 — where does the decimal point go? (a) 0.126 (b) 12.6 (c) 0.0126 (d) 1.26
  17. 17.2.4 × 33 — where does the decimal point go? (a) 7.92 (b) 0.792 (c) 792 (d) 79.2
  18. 18.4.3 × 0.2 — where does the decimal point go? (a) 0.086 (b) 0.0086 (c) 8.6 (d) 0.86
  19. 19.1.9 × 0.6 — where does the decimal point go? (a) 11.4 (b) 1.14 (c) 0.0114 (d) 0.114
  20. 20.2.2 × 4.1 — where does the decimal point go? (a) 9.02 (b) 0.0902 (c) 0.902 (d) 90.2
  21. 21.2.2 × 0.8 — where does the decimal point go? (a) 0.176 (b) 17.6 (c) 0.0176 (d) 1.76
  22. 22.3.6 × 8 — where does the decimal point go? (a) 28.8 (b) 2.88 (c) 0.288 (d) 288
  23. 23.2.8 × 43 — where does the decimal point go? (a) 120.4 (b) 1.204 (c) 12.04 (d) 1204
  24. 24.6.7 × 0.5 — where does the decimal point go? (a) 0.335 (b) 3.35 (c) 0.0335 (d) 33.5
  25. 25.3.4 × 9 — where does the decimal point go? (a) 306 (b) 3.06 (c) 30.6 (d) 0.306
  26. 26.0.77 × 4 — where does the decimal point go? (a) 3.08 (b) 0.308 (c) 30.8 (d) 0.0308
  27. 27.0.33 × 6 — where does the decimal point go? (a) 1.98 (b) 0.198 (c) 0.0198 (d) 19.8
  28. 28.3.1 × 6 — where does the decimal point go? (a) 0.186 (b) 1.86 (c) 18.6 (d) 186
  29. 29.0.53 × 9 — where does the decimal point go? (a) 4.77 (b) 0.477 (c) 0.0477 (d) 47.7
  30. 30.6.2 × 2 — where does the decimal point go? (a) 1.24 (b) 124 (c) 12.4 (d) 0.124
  31. 31.0.63 × 29 — where does the decimal point go? (a) 1.827 (b) 0.1827 (c) 182.7 (d) 18.27
  32. 32.0.67 × 0.5 — where does the decimal point go? (a) 0.00335 (b) 3.35 (c) 0.335 (d) 0.0335
  33. 33.0.34 × 0.6 — where does the decimal point go? (a) 0.204 (b) 0.0204 (c) 2.04 (d) 0.00204
  34. 34.8.9 × 0.7 — where does the decimal point go? (a) 6.23 (b) 62.3 (c) 0.0623 (d) 0.623
  35. 35.3.5 × 0.3 — where does the decimal point go? (a) 0.105 (b) 0.0105 (c) 10.5 (d) 1.05
  36. 36.8.1 × 7 — where does the decimal point go? (a) 567 (b) 0.567 (c) 56.7 (d) 5.67
  37. 37.1.7 × 2 — where does the decimal point go? (a) 0.34 (b) 34 (c) 3.4 (d) 0.034
  38. 38.4.1 × 17 — where does the decimal point go? (a) 69.7 (b) 0.697 (c) 6.97 (d) 697
  39. 39.9.4 × 1.6 — where does the decimal point go? (a) 150.4 (b) 15.04 (c) 0.1504 (d) 1.504
  40. 40.0.42 × 9 — where does the decimal point go? (a) 0.378 (b) 0.0378 (c) 3.78 (d) 37.8

Answer key

  1. 212.5
  2. 4.83
  3. 25.2
  4. 4.32
  5. 8.85
  6. 3.36
  7. 0.644
  8. 0.42
  9. 1.86
  10. 214.6
  11. 0.091
  12. 3.05
  13. 43.65
  14. 59.4
  15. 0.222
  16. 1.26
  17. 79.2
  18. 0.86
  19. 1.14
  20. 9.02
  21. 1.76
  22. 28.8
  23. 120.4
  24. 3.35
  25. 30.6
  26. 3.08
  27. 1.98
  28. 18.6
  29. 4.77
  30. 12.4
  31. 18.27
  32. 0.335
  33. 0.204
  34. 6.23
  35. 1.05
  36. 56.7
  37. 3.4
  38. 69.7
  39. 15.04
  40. 3.78

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