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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 948 · 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. 1.2.9 × 11 — where does the decimal point go? (a) 31.9 (b) 3.19 (c) 0.319 (d) 319
  2. 2.0.17 × 0.4 — where does the decimal point go? (a) 0.00068 (b) 0.68 (c) 0.068 (d) 0.0068
  3. 3.5.7 × 4.9 — where does the decimal point go? (a) 2.793 (b) 0.2793 (c) 279.3 (d) 27.93
  4. 4.9.6 × 4.4 — where does the decimal point go? (a) 42.24 (b) 0.4224 (c) 4.224 (d) 422.4
  5. 5.0.88 × 0.2 — where does the decimal point go? (a) 0.00176 (b) 1.76 (c) 0.176 (d) 0.0176
  6. 6.3.5 × 3 — where does the decimal point go? (a) 1.05 (b) 105 (c) 0.105 (d) 10.5
  7. 7.3.2 × 1.2 — where does the decimal point go? (a) 0.384 (b) 38.4 (c) 3.84 (d) 0.0384
  8. 8.0.16 × 2 — where does the decimal point go? (a) 3.2 (b) 0.032 (c) 0.32 (d) 0.0032
  9. 9.0.71 × 4.5 — where does the decimal point go? (a) 0.03195 (b) 31.95 (c) 0.3195 (d) 3.195
  10. 10.0.86 × 22 — where does the decimal point go? (a) 1.892 (b) 18.92 (c) 189.2 (d) 0.1892
  11. 11.0.16 × 0.3 — where does the decimal point go? (a) 0.048 (b) 0.0048 (c) 0.00048 (d) 0.48
  12. 12.8.6 × 0.3 — where does the decimal point go? (a) 2.58 (b) 0.258 (c) 0.0258 (d) 25.8
  13. 13.9.7 × 29 — where does the decimal point go? (a) 2.813 (b) 281.3 (c) 2813 (d) 28.13
  14. 14.5.9 × 3.9 — where does the decimal point go? (a) 230.1 (b) 0.2301 (c) 2.301 (d) 23.01
  15. 15.0.46 × 0.3 — where does the decimal point go? (a) 0.00138 (b) 0.0138 (c) 1.38 (d) 0.138
  16. 16.0.26 × 4.1 — where does the decimal point go? (a) 10.66 (b) 1.066 (c) 0.1066 (d) 0.01066
  17. 17.4.2 × 0.7 — where does the decimal point go? (a) 29.4 (b) 0.294 (c) 2.94 (d) 0.0294
  18. 18.3.2 × 4.1 — where does the decimal point go? (a) 13.12 (b) 1.312 (c) 0.1312 (d) 131.2
  19. 19.9.8 × 8 — where does the decimal point go? (a) 784 (b) 7.84 (c) 0.784 (d) 78.4
  20. 20.2.3 × 4 — where does the decimal point go? (a) 0.092 (b) 9.2 (c) 0.92 (d) 92
  21. 21.0.41 × 2.6 — where does the decimal point go? (a) 10.66 (b) 0.01066 (c) 1.066 (d) 0.1066
  22. 22.0.56 × 0.7 — where does the decimal point go? (a) 0.00392 (b) 0.392 (c) 0.0392 (d) 3.92
  23. 23.0.54 × 4.4 — where does the decimal point go? (a) 23.76 (b) 0.2376 (c) 2.376 (d) 0.02376
  24. 24.4.6 × 9 — where does the decimal point go? (a) 414 (b) 4.14 (c) 0.414 (d) 41.4
  25. 25.6.8 × 6 — where does the decimal point go? (a) 408 (b) 0.408 (c) 4.08 (d) 40.8
  26. 26.5.6 × 9 — where does the decimal point go? (a) 504 (b) 0.504 (c) 5.04 (d) 50.4
  27. 27.8.9 × 0.3 — where does the decimal point go? (a) 0.0267 (b) 0.267 (c) 26.7 (d) 2.67
  28. 28.2.9 × 32 — where does the decimal point go? (a) 0.928 (b) 92.8 (c) 9.28 (d) 928
  29. 29.3.3 × 9 — where does the decimal point go? (a) 2.97 (b) 29.7 (c) 297 (d) 0.297
  30. 30.0.16 × 0.8 — where does the decimal point go? (a) 0.128 (b) 1.28 (c) 0.00128 (d) 0.0128
  31. 31.0.26 × 17 — where does the decimal point go? (a) 0.442 (b) 4.42 (c) 0.0442 (d) 44.2
  32. 32.0.88 × 4 — where does the decimal point go? (a) 0.352 (b) 0.0352 (c) 35.2 (d) 3.52
  33. 33.0.68 × 3 — where does the decimal point go? (a) 20.4 (b) 0.204 (c) 0.0204 (d) 2.04
  34. 34.0.99 × 1.9 — where does the decimal point go? (a) 0.01881 (b) 0.1881 (c) 1.881 (d) 18.81
  35. 35.8.6 × 7 — where does the decimal point go? (a) 6.02 (b) 60.2 (c) 0.602 (d) 602
  36. 36.1.4 × 9 — where does the decimal point go? (a) 12.6 (b) 1.26 (c) 126 (d) 0.126
  37. 37.0.19 × 41 — where does the decimal point go? (a) 0.779 (b) 77.9 (c) 0.0779 (d) 7.79
  38. 38.0.85 × 3 — where does the decimal point go? (a) 2.55 (b) 0.255 (c) 0.0255 (d) 25.5
  39. 39.1.3 × 32 — where does the decimal point go? (a) 4.16 (b) 41.6 (c) 0.416 (d) 416
  40. 40.9.1 × 0.3 — where does the decimal point go? (a) 0.273 (b) 0.0273 (c) 27.3 (d) 2.73

Answer key

  1. 31.9
  2. 0.068
  3. 27.93
  4. 42.24
  5. 0.176
  6. 10.5
  7. 3.84
  8. 0.32
  9. 3.195
  10. 18.92
  11. 0.048
  12. 2.58
  13. 281.3
  14. 23.01
  15. 0.138
  16. 1.066
  17. 2.94
  18. 13.12
  19. 78.4
  20. 9.2
  21. 1.066
  22. 0.392
  23. 2.376
  24. 41.4
  25. 40.8
  26. 50.4
  27. 2.67
  28. 92.8
  29. 29.7
  30. 0.128
  31. 4.42
  32. 3.52
  33. 2.04
  34. 1.881
  35. 60.2
  36. 12.6
  37. 7.79
  38. 2.55
  39. 41.6
  40. 2.73

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