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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 863 · 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. 1.0.84 × 3 — where does the decimal point go? (a) 25.2 (b) 2.52 (c) 0.0252 (d) 0.252
  2. 2.0.16 × 29 — where does the decimal point go? (a) 0.464 (b) 0.0464 (c) 4.64 (d) 46.4
  3. 3.0.92 × 34 — where does the decimal point go? (a) 31.28 (b) 3.128 (c) 312.8 (d) 0.3128
  4. 4.9.1 × 19 — where does the decimal point go? (a) 17.29 (b) 1729 (c) 1.729 (d) 172.9
  5. 5.0.31 × 0.6 — where does the decimal point go? (a) 1.86 (b) 0.00186 (c) 0.186 (d) 0.0186
  6. 6.9.9 × 16 — where does the decimal point go? (a) 158.4 (b) 15.84 (c) 1.584 (d) 1584
  7. 7.0.37 × 0.3 — where does the decimal point go? (a) 0.00111 (b) 1.11 (c) 0.0111 (d) 0.111
  8. 8.0.49 × 2.3 — where does the decimal point go? (a) 1.127 (b) 0.1127 (c) 0.01127 (d) 11.27
  9. 9.0.89 × 1.7 — where does the decimal point go? (a) 0.1513 (b) 1.513 (c) 15.13 (d) 0.01513
  10. 10.0.75 × 41 — where does the decimal point go? (a) 0.3075 (b) 3.075 (c) 30.75 (d) 307.5
  11. 11.4.6 × 3.6 — where does the decimal point go? (a) 16.56 (b) 165.6 (c) 0.1656 (d) 1.656
  12. 12.0.89 × 0.5 — where does the decimal point go? (a) 0.445 (b) 4.45 (c) 0.0445 (d) 0.00445
  13. 13.4.2 × 1.4 — where does the decimal point go? (a) 0.0588 (b) 58.8 (c) 0.588 (d) 5.88
  14. 14.3.3 × 6 — where does the decimal point go? (a) 1.98 (b) 0.198 (c) 198 (d) 19.8
  15. 15.3.6 × 4 — where does the decimal point go? (a) 144 (b) 0.144 (c) 1.44 (d) 14.4
  16. 16.7.2 × 4.7 — where does the decimal point go? (a) 3.384 (b) 0.3384 (c) 338.4 (d) 33.84
  17. 17.2.2 × 3 — where does the decimal point go? (a) 6.6 (b) 66 (c) 0.066 (d) 0.66
  18. 18.3.1 × 5 — where does the decimal point go? (a) 1.55 (b) 155 (c) 15.5 (d) 0.155
  19. 19.4.8 × 37 — where does the decimal point go? (a) 177.6 (b) 1776 (c) 17.76 (d) 1.776
  20. 20.3.1 × 22 — where does the decimal point go? (a) 682 (b) 0.682 (c) 6.82 (d) 68.2
  21. 21.2.1 × 2 — where does the decimal point go? (a) 4.2 (b) 0.042 (c) 42 (d) 0.42
  22. 22.6.3 × 9 — where does the decimal point go? (a) 56.7 (b) 5.67 (c) 567 (d) 0.567
  23. 23.2.6 × 32 — where does the decimal point go? (a) 8.32 (b) 83.2 (c) 0.832 (d) 832
  24. 24.0.23 × 8 — where does the decimal point go? (a) 1.84 (b) 0.184 (c) 0.0184 (d) 18.4
  25. 25.3.7 × 8 — where does the decimal point go? (a) 296 (b) 0.296 (c) 2.96 (d) 29.6
  26. 26.0.16 × 8 — where does the decimal point go? (a) 1.28 (b) 12.8 (c) 0.128 (d) 0.0128
  27. 27.5.9 × 0.8 — where does the decimal point go? (a) 4.72 (b) 0.472 (c) 0.0472 (d) 47.2
  28. 28.8.2 × 0.7 — where does the decimal point go? (a) 0.574 (b) 0.0574 (c) 5.74 (d) 57.4
  29. 29.0.48 × 2.4 — where does the decimal point go? (a) 0.1152 (b) 11.52 (c) 1.152 (d) 0.01152
  30. 30.0.72 × 3.8 — where does the decimal point go? (a) 0.2736 (b) 27.36 (c) 0.02736 (d) 2.736
  31. 31.6.3 × 6 — where does the decimal point go? (a) 3.78 (b) 378 (c) 37.8 (d) 0.378
  32. 32.2.7 × 2.4 — where does the decimal point go? (a) 64.8 (b) 0.648 (c) 0.0648 (d) 6.48
  33. 33.3.8 × 31 — where does the decimal point go? (a) 11.78 (b) 117.8 (c) 1178 (d) 1.178
  34. 34.5.4 × 0.9 — where does the decimal point go? (a) 0.0486 (b) 48.6 (c) 4.86 (d) 0.486
  35. 35.2.9 × 2 — where does the decimal point go? (a) 0.058 (b) 58 (c) 5.8 (d) 0.58
  36. 36.0.32 × 4.2 — where does the decimal point go? (a) 13.44 (b) 1.344 (c) 0.1344 (d) 0.01344
  37. 37.7.9 × 1.4 — where does the decimal point go? (a) 0.1106 (b) 1.106 (c) 11.06 (d) 110.6
  38. 38.9.3 × 2 — where does the decimal point go? (a) 18.6 (b) 186 (c) 1.86 (d) 0.186
  39. 39.8.2 × 0.4 — where does the decimal point go? (a) 3.28 (b) 0.328 (c) 0.0328 (d) 32.8
  40. 40.3.2 × 0.6 — where does the decimal point go? (a) 1.92 (b) 0.0192 (c) 19.2 (d) 0.192

Answer key

  1. 2.52
  2. 4.64
  3. 31.28
  4. 172.9
  5. 0.186
  6. 158.4
  7. 0.111
  8. 1.127
  9. 1.513
  10. 30.75
  11. 16.56
  12. 0.445
  13. 5.88
  14. 19.8
  15. 14.4
  16. 33.84
  17. 6.6
  18. 15.5
  19. 177.6
  20. 68.2
  21. 4.2
  22. 56.7
  23. 83.2
  24. 1.84
  25. 29.6
  26. 1.28
  27. 4.72
  28. 5.74
  29. 1.152
  30. 2.736
  31. 37.8
  32. 6.48
  33. 117.8
  34. 4.86
  35. 5.8
  36. 1.344
  37. 11.06
  38. 18.6
  39. 3.28
  40. 1.92

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