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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 242 · 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. 1.0.24 × 43 — where does the decimal point go? (a) 103.2 (b) 1.032 (c) 0.1032 (d) 10.32
  2. 2.7.4 × 4.4 — where does the decimal point go? (a) 3.256 (b) 0.3256 (c) 325.6 (d) 32.56
  3. 3.7.9 × 9 — where does the decimal point go? (a) 711 (b) 0.711 (c) 7.11 (d) 71.1
  4. 4.1.3 × 13 — where does the decimal point go? (a) 0.169 (b) 16.9 (c) 169 (d) 1.69
  5. 5.0.64 × 9 — where does the decimal point go? (a) 0.576 (b) 0.0576 (c) 5.76 (d) 57.6
  6. 6.0.72 × 3 — where does the decimal point go? (a) 0.0216 (b) 21.6 (c) 2.16 (d) 0.216
  7. 7.5.7 × 43 — where does the decimal point go? (a) 245.1 (b) 24.51 (c) 2.451 (d) 2451
  8. 8.0.18 × 4.8 — where does the decimal point go? (a) 8.64 (b) 0.00864 (c) 0.0864 (d) 0.864
  9. 9.8.9 × 42 — where does the decimal point go? (a) 37.38 (b) 373.8 (c) 3738 (d) 3.738
  10. 10.0.63 × 2.1 — where does the decimal point go? (a) 0.01323 (b) 0.1323 (c) 1.323 (d) 13.23
  11. 11.0.38 × 3 — where does the decimal point go? (a) 0.0114 (b) 1.14 (c) 11.4 (d) 0.114
  12. 12.0.92 × 46 — where does the decimal point go? (a) 423.2 (b) 42.32 (c) 4.232 (d) 0.4232
  13. 13.0.97 × 3 — where does the decimal point go? (a) 2.91 (b) 0.291 (c) 0.0291 (d) 29.1
  14. 14.3.3 × 2 — where does the decimal point go? (a) 0.66 (b) 6.6 (c) 66 (d) 0.066
  15. 15.8.4 × 1.7 — where does the decimal point go? (a) 0.1428 (b) 14.28 (c) 1.428 (d) 142.8
  16. 16.4.1 × 0.4 — where does the decimal point go? (a) 1.64 (b) 16.4 (c) 0.0164 (d) 0.164
  17. 17.2.7 × 3.4 — where does the decimal point go? (a) 0.918 (b) 91.8 (c) 0.0918 (d) 9.18
  18. 18.6.3 × 24 — where does the decimal point go? (a) 1512 (b) 15.12 (c) 151.2 (d) 1.512
  19. 19.3.1 × 0.2 — where does the decimal point go? (a) 0.62 (b) 0.062 (c) 6.2 (d) 0.0062
  20. 20.8.8 × 9 — where does the decimal point go? (a) 79.2 (b) 792 (c) 0.792 (d) 7.92
  21. 21.1.9 × 18 — where does the decimal point go? (a) 3.42 (b) 34.2 (c) 0.342 (d) 342
  22. 22.7.1 × 0.4 — where does the decimal point go? (a) 0.0284 (b) 28.4 (c) 0.284 (d) 2.84
  23. 23.5.1 × 0.8 — where does the decimal point go? (a) 40.8 (b) 4.08 (c) 0.0408 (d) 0.408
  24. 24.0.36 × 0.6 — where does the decimal point go? (a) 0.00216 (b) 2.16 (c) 0.216 (d) 0.0216
  25. 25.0.79 × 44 — where does the decimal point go? (a) 3.476 (b) 347.6 (c) 34.76 (d) 0.3476
  26. 26.9.7 × 0.2 — where does the decimal point go? (a) 19.4 (b) 0.194 (c) 0.0194 (d) 1.94
  27. 27.1.3 × 0.2 — where does the decimal point go? (a) 2.6 (b) 0.0026 (c) 0.26 (d) 0.026
  28. 28.8.6 × 0.9 — where does the decimal point go? (a) 0.774 (b) 77.4 (c) 7.74 (d) 0.0774
  29. 29.9.2 × 36 — where does the decimal point go? (a) 331.2 (b) 33.12 (c) 3.312 (d) 3312
  30. 30.9.5 × 0.3 — where does the decimal point go? (a) 0.0285 (b) 0.285 (c) 28.5 (d) 2.85
  31. 31.0.43 × 9 — where does the decimal point go? (a) 3.87 (b) 0.387 (c) 0.0387 (d) 38.7
  32. 32.0.75 × 1.3 — where does the decimal point go? (a) 9.75 (b) 0.975 (c) 0.00975 (d) 0.0975
  33. 33.0.91 × 41 — where does the decimal point go? (a) 0.3731 (b) 373.1 (c) 3.731 (d) 37.31
  34. 34.0.91 × 27 — where does the decimal point go? (a) 0.2457 (b) 2.457 (c) 24.57 (d) 245.7
  35. 35.0.85 × 0.3 — where does the decimal point go? (a) 2.55 (b) 0.00255 (c) 0.255 (d) 0.0255
  36. 36.0.62 × 3 — where does the decimal point go? (a) 0.186 (b) 18.6 (c) 1.86 (d) 0.0186
  37. 37.0.71 × 49 — where does the decimal point go? (a) 3.479 (b) 0.3479 (c) 34.79 (d) 347.9
  38. 38.2.2 × 3.6 — where does the decimal point go? (a) 79.2 (b) 0.792 (c) 0.0792 (d) 7.92
  39. 39.0.29 × 2 — where does the decimal point go? (a) 0.0058 (b) 0.058 (c) 5.8 (d) 0.58
  40. 40.0.77 × 0.9 — where does the decimal point go? (a) 6.93 (b) 0.693 (c) 0.0693 (d) 0.00693

Answer key

  1. 10.32
  2. 32.56
  3. 71.1
  4. 16.9
  5. 5.76
  6. 2.16
  7. 245.1
  8. 0.864
  9. 373.8
  10. 1.323
  11. 1.14
  12. 42.32
  13. 2.91
  14. 6.6
  15. 14.28
  16. 1.64
  17. 9.18
  18. 151.2
  19. 0.62
  20. 79.2
  21. 34.2
  22. 2.84
  23. 4.08
  24. 0.216
  25. 34.76
  26. 1.94
  27. 0.26
  28. 7.74
  29. 331.2
  30. 2.85
  31. 3.87
  32. 0.975
  33. 37.31
  34. 24.57
  35. 0.255
  36. 1.86
  37. 34.79
  38. 7.92
  39. 0.58
  40. 0.693

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