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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 814 · 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. 1.6.4 × 18 — where does the decimal point go? (a) 11.52 (b) 1152 (c) 1.152 (d) 115.2
  2. 2.9.9 × 2 — where does the decimal point go? (a) 198 (b) 0.198 (c) 19.8 (d) 1.98
  3. 3.0.88 × 0.7 — where does the decimal point go? (a) 0.616 (b) 6.16 (c) 0.0616 (d) 0.00616
  4. 4.0.12 × 6 — where does the decimal point go? (a) 0.72 (b) 0.072 (c) 0.0072 (d) 7.2
  5. 5.0.55 × 5 — where does the decimal point go? (a) 2.75 (b) 27.5 (c) 0.0275 (d) 0.275
  6. 6.6.8 × 34 — where does the decimal point go? (a) 2.312 (b) 23.12 (c) 2312 (d) 231.2
  7. 7.3.4 × 0.9 — where does the decimal point go? (a) 3.06 (b) 0.0306 (c) 0.306 (d) 30.6
  8. 8.0.35 × 0.5 — where does the decimal point go? (a) 1.75 (b) 0.0175 (c) 0.175 (d) 0.00175
  9. 9.4.8 × 2 — where does the decimal point go? (a) 0.96 (b) 0.096 (c) 96 (d) 9.6
  10. 10.8.3 × 3.9 — where does the decimal point go? (a) 0.3237 (b) 323.7 (c) 32.37 (d) 3.237
  11. 11.0.13 × 1.2 — where does the decimal point go? (a) 0.00156 (b) 0.0156 (c) 0.156 (d) 1.56
  12. 12.4.5 × 11 — where does the decimal point go? (a) 0.495 (b) 49.5 (c) 495 (d) 4.95
  13. 13.1.9 × 41 — where does the decimal point go? (a) 77.9 (b) 7.79 (c) 0.779 (d) 779
  14. 14.3.2 × 2 — where does the decimal point go? (a) 6.4 (b) 0.64 (c) 64 (d) 0.064
  15. 15.0.37 × 1.6 — where does the decimal point go? (a) 0.00592 (b) 5.92 (c) 0.592 (d) 0.0592
  16. 16.0.29 × 0.8 — where does the decimal point go? (a) 0.00232 (b) 0.232 (c) 2.32 (d) 0.0232
  17. 17.2.6 × 43 — where does the decimal point go? (a) 111.8 (b) 11.18 (c) 1.118 (d) 1118
  18. 18.3.6 × 1.7 — where does the decimal point go? (a) 0.0612 (b) 6.12 (c) 0.612 (d) 61.2
  19. 19.1.7 × 24 — where does the decimal point go? (a) 0.408 (b) 40.8 (c) 4.08 (d) 408
  20. 20.5.4 × 0.4 — where does the decimal point go? (a) 0.0216 (b) 21.6 (c) 0.216 (d) 2.16
  21. 21.9.7 × 0.4 — where does the decimal point go? (a) 0.388 (b) 3.88 (c) 38.8 (d) 0.0388
  22. 22.4.4 × 22 — where does the decimal point go? (a) 968 (b) 9.68 (c) 0.968 (d) 96.8
  23. 23.0.87 × 23 — where does the decimal point go? (a) 0.2001 (b) 200.1 (c) 20.01 (d) 2.001
  24. 24.4.4 × 2.2 — where does the decimal point go? (a) 0.0968 (b) 0.968 (c) 9.68 (d) 96.8
  25. 25.0.22 × 4 — where does the decimal point go? (a) 0.088 (b) 0.0088 (c) 8.8 (d) 0.88
  26. 26.0.44 × 9 — where does the decimal point go? (a) 0.0396 (b) 3.96 (c) 0.396 (d) 39.6
  27. 27.0.42 × 0.9 — where does the decimal point go? (a) 0.0378 (b) 0.378 (c) 0.00378 (d) 3.78
  28. 28.0.79 × 4 — where does the decimal point go? (a) 0.0316 (b) 0.316 (c) 3.16 (d) 31.6
  29. 29.6.6 × 0.7 — where does the decimal point go? (a) 46.2 (b) 0.462 (c) 4.62 (d) 0.0462
  30. 30.0.71 × 3.5 — where does the decimal point go? (a) 0.02485 (b) 24.85 (c) 0.2485 (d) 2.485
  31. 31.7.2 × 7 — where does the decimal point go? (a) 50.4 (b) 5.04 (c) 0.504 (d) 504
  32. 32.0.26 × 6 — where does the decimal point go? (a) 0.0156 (b) 15.6 (c) 0.156 (d) 1.56
  33. 33.0.26 × 24 — where does the decimal point go? (a) 0.0624 (b) 62.4 (c) 6.24 (d) 0.624
  34. 34.0.97 × 34 — where does the decimal point go? (a) 3.298 (b) 329.8 (c) 32.98 (d) 0.3298
  35. 35.0.46 × 31 — where does the decimal point go? (a) 0.1426 (b) 1.426 (c) 14.26 (d) 142.6
  36. 36.9.8 × 2 — where does the decimal point go? (a) 19.6 (b) 196 (c) 1.96 (d) 0.196
  37. 37.0.96 × 16 — where does the decimal point go? (a) 0.1536 (b) 15.36 (c) 153.6 (d) 1.536
  38. 38.4.1 × 2 — where does the decimal point go? (a) 0.82 (b) 8.2 (c) 82 (d) 0.082
  39. 39.8.9 × 2.8 — where does the decimal point go? (a) 249.2 (b) 0.2492 (c) 2.492 (d) 24.92
  40. 40.9.2 × 1.4 — where does the decimal point go? (a) 0.1288 (b) 128.8 (c) 12.88 (d) 1.288

Answer key

  1. 115.2
  2. 19.8
  3. 0.616
  4. 0.72
  5. 2.75
  6. 231.2
  7. 3.06
  8. 0.175
  9. 9.6
  10. 32.37
  11. 0.156
  12. 49.5
  13. 77.9
  14. 6.4
  15. 0.592
  16. 0.232
  17. 111.8
  18. 6.12
  19. 40.8
  20. 2.16
  21. 3.88
  22. 96.8
  23. 20.01
  24. 9.68
  25. 0.88
  26. 3.96
  27. 0.378
  28. 3.16
  29. 4.62
  30. 2.485
  31. 50.4
  32. 1.56
  33. 6.24
  34. 32.98
  35. 14.26
  36. 19.6
  37. 15.36
  38. 8.2
  39. 24.92
  40. 12.88

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