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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 990 · 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. 1.0.34 × 9 — where does the decimal point go? (a) 0.0306 (b) 0.306 (c) 3.06 (d) 30.6
  2. 2.3.7 × 4.2 — where does the decimal point go? (a) 155.4 (b) 1.554 (c) 0.1554 (d) 15.54
  3. 3.9.2 × 4.7 — where does the decimal point go? (a) 4.324 (b) 0.4324 (c) 432.4 (d) 43.24
  4. 4.5.4 × 0.9 — where does the decimal point go? (a) 48.6 (b) 4.86 (c) 0.486 (d) 0.0486
  5. 5.1.2 × 0.2 — where does the decimal point go? (a) 0.24 (b) 0.024 (c) 0.0024 (d) 2.4
  6. 6.0.91 × 0.8 — where does the decimal point go? (a) 0.0728 (b) 0.728 (c) 7.28 (d) 0.00728
  7. 7.0.81 × 0.7 — where does the decimal point go? (a) 0.0567 (b) 0.00567 (c) 0.567 (d) 5.67
  8. 8.1.5 × 9 — where does the decimal point go? (a) 13.5 (b) 135 (c) 1.35 (d) 0.135
  9. 9.0.47 × 1.6 — where does the decimal point go? (a) 7.52 (b) 0.00752 (c) 0.0752 (d) 0.752
  10. 10.0.87 × 0.6 — where does the decimal point go? (a) 0.0522 (b) 5.22 (c) 0.00522 (d) 0.522
  11. 11.1.4 × 8 — where does the decimal point go? (a) 1.12 (b) 11.2 (c) 0.112 (d) 112
  12. 12.0.65 × 0.3 — where does the decimal point go? (a) 0.195 (b) 0.0195 (c) 0.00195 (d) 1.95
  13. 13.3.4 × 0.3 — where does the decimal point go? (a) 0.102 (b) 10.2 (c) 0.0102 (d) 1.02
  14. 14.0.61 × 7 — where does the decimal point go? (a) 0.427 (b) 42.7 (c) 4.27 (d) 0.0427
  15. 15.0.91 × 4.3 — where does the decimal point go? (a) 0.3913 (b) 3.913 (c) 0.03913 (d) 39.13
  16. 16.1.9 × 0.4 — where does the decimal point go? (a) 0.076 (b) 0.76 (c) 7.6 (d) 0.0076
  17. 17.0.69 × 0.3 — where does the decimal point go? (a) 0.207 (b) 0.0207 (c) 0.00207 (d) 2.07
  18. 18.4.1 × 4.6 — where does the decimal point go? (a) 1.886 (b) 18.86 (c) 188.6 (d) 0.1886
  19. 19.5.3 × 0.9 — where does the decimal point go? (a) 4.77 (b) 47.7 (c) 0.477 (d) 0.0477
  20. 20.0.67 × 32 — where does the decimal point go? (a) 2.144 (b) 21.44 (c) 214.4 (d) 0.2144
  21. 21.7.3 × 4 — where does the decimal point go? (a) 0.292 (b) 292 (c) 2.92 (d) 29.2
  22. 22.4.1 × 1.8 — where does the decimal point go? (a) 7.38 (b) 0.738 (c) 0.0738 (d) 73.8
  23. 23.0.25 × 0.5 — where does the decimal point go? (a) 0.00125 (b) 0.0125 (c) 0.125 (d) 1.25
  24. 24.0.26 × 0.8 — where does the decimal point go? (a) 0.208 (b) 0.0208 (c) 0.00208 (d) 2.08
  25. 25.0.13 × 2.3 — where does the decimal point go? (a) 0.0299 (b) 0.299 (c) 2.99 (d) 0.00299
  26. 26.6.6 × 4 — where does the decimal point go? (a) 0.264 (b) 264 (c) 2.64 (d) 26.4
  27. 27.0.79 × 3.5 — where does the decimal point go? (a) 0.02765 (b) 2.765 (c) 27.65 (d) 0.2765
  28. 28.7.9 × 0.3 — where does the decimal point go? (a) 2.37 (b) 0.237 (c) 23.7 (d) 0.0237
  29. 29.3.1 × 4 — where does the decimal point go? (a) 12.4 (b) 1.24 (c) 0.124 (d) 124
  30. 30.3.6 × 12 — where does the decimal point go? (a) 0.432 (b) 4.32 (c) 432 (d) 43.2
  31. 31.1.3 × 0.2 — where does the decimal point go? (a) 2.6 (b) 0.026 (c) 0.26 (d) 0.0026
  32. 32.0.89 × 7 — where does the decimal point go? (a) 6.23 (b) 62.3 (c) 0.623 (d) 0.0623
  33. 33.2.1 × 1.5 — where does the decimal point go? (a) 31.5 (b) 3.15 (c) 0.315 (d) 0.0315
  34. 34.0.56 × 48 — where does the decimal point go? (a) 268.8 (b) 2.688 (c) 0.2688 (d) 26.88
  35. 35.2.9 × 19 — where does the decimal point go? (a) 0.551 (b) 551 (c) 5.51 (d) 55.1
  36. 36.0.49 × 2 — where does the decimal point go? (a) 0.098 (b) 9.8 (c) 0.98 (d) 0.0098
  37. 37.0.67 × 9 — where does the decimal point go? (a) 0.603 (b) 60.3 (c) 0.0603 (d) 6.03
  38. 38.2.9 × 3 — where does the decimal point go? (a) 87 (b) 0.87 (c) 0.087 (d) 8.7
  39. 39.8.1 × 8 — where does the decimal point go? (a) 6.48 (b) 648 (c) 64.8 (d) 0.648
  40. 40.1.9 × 0.9 — where does the decimal point go? (a) 0.171 (b) 1.71 (c) 0.0171 (d) 17.1

Answer key

  1. 3.06
  2. 15.54
  3. 43.24
  4. 4.86
  5. 0.24
  6. 0.728
  7. 0.567
  8. 13.5
  9. 0.752
  10. 0.522
  11. 11.2
  12. 0.195
  13. 1.02
  14. 4.27
  15. 3.913
  16. 0.76
  17. 0.207
  18. 18.86
  19. 4.77
  20. 21.44
  21. 29.2
  22. 7.38
  23. 0.125
  24. 0.208
  25. 0.299
  26. 26.4
  27. 2.765
  28. 2.37
  29. 12.4
  30. 43.2
  31. 0.26
  32. 6.23
  33. 3.15
  34. 26.88
  35. 55.1
  36. 0.98
  37. 6.03
  38. 8.7
  39. 64.8
  40. 1.71

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