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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 420 · 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. 1.7.6 × 0.7 — where does the decimal point go? (a) 0.532 (b) 0.0532 (c) 53.2 (d) 5.32
  2. 2.0.22 × 3.6 — where does the decimal point go? (a) 0.792 (b) 0.00792 (c) 0.0792 (d) 7.92
  3. 3.3.3 × 3 — where does the decimal point go? (a) 0.99 (b) 0.099 (c) 9.9 (d) 99
  4. 4.0.39 × 7 — where does the decimal point go? (a) 2.73 (b) 0.0273 (c) 0.273 (d) 27.3
  5. 5.0.71 × 3 — where does the decimal point go? (a) 0.213 (b) 21.3 (c) 2.13 (d) 0.0213
  6. 6.0.31 × 27 — where does the decimal point go? (a) 0.837 (b) 83.7 (c) 0.0837 (d) 8.37
  7. 7.0.51 × 39 — where does the decimal point go? (a) 0.1989 (b) 19.89 (c) 198.9 (d) 1.989
  8. 8.3.2 × 6 — where does the decimal point go? (a) 192 (b) 1.92 (c) 0.192 (d) 19.2
  9. 9.9.4 × 4 — where does the decimal point go? (a) 376 (b) 37.6 (c) 0.376 (d) 3.76
  10. 10.4.3 × 47 — where does the decimal point go? (a) 20.21 (b) 2021 (c) 2.021 (d) 202.1
  11. 11.0.41 × 22 — where does the decimal point go? (a) 90.2 (b) 0.902 (c) 9.02 (d) 0.0902
  12. 12.7.9 × 49 — where does the decimal point go? (a) 3871 (b) 387.1 (c) 38.71 (d) 3.871
  13. 13.0.46 × 4.9 — where does the decimal point go? (a) 22.54 (b) 2.254 (c) 0.2254 (d) 0.02254
  14. 14.3.7 × 9 — where does the decimal point go? (a) 3.33 (b) 33.3 (c) 333 (d) 0.333
  15. 15.0.98 × 0.6 — where does the decimal point go? (a) 0.588 (b) 5.88 (c) 0.0588 (d) 0.00588
  16. 16.0.94 × 0.4 — where does the decimal point go? (a) 3.76 (b) 0.376 (c) 0.00376 (d) 0.0376
  17. 17.2.9 × 0.2 — where does the decimal point go? (a) 0.0058 (b) 0.58 (c) 0.058 (d) 5.8
  18. 18.3.9 × 2.8 — where does the decimal point go? (a) 109.2 (b) 0.1092 (c) 1.092 (d) 10.92
  19. 19.0.22 × 12 — where does the decimal point go? (a) 26.4 (b) 0.264 (c) 2.64 (d) 0.0264
  20. 20.0.19 × 44 — where does the decimal point go? (a) 0.836 (b) 0.0836 (c) 8.36 (d) 83.6
  21. 21.0.71 × 28 — where does the decimal point go? (a) 0.1988 (b) 19.88 (c) 1.988 (d) 198.8
  22. 22.8.3 × 0.8 — where does the decimal point go? (a) 66.4 (b) 0.664 (c) 0.0664 (d) 6.64
  23. 23.0.83 × 0.4 — where does the decimal point go? (a) 3.32 (b) 0.332 (c) 0.0332 (d) 0.00332
  24. 24.0.24 × 1.6 — where does the decimal point go? (a) 0.00384 (b) 0.0384 (c) 3.84 (d) 0.384
  25. 25.5.2 × 9 — where does the decimal point go? (a) 4.68 (b) 0.468 (c) 468 (d) 46.8
  26. 26.0.74 × 2.8 — where does the decimal point go? (a) 0.02072 (b) 0.2072 (c) 2.072 (d) 20.72
  27. 27.0.12 × 4.1 — where does the decimal point go? (a) 0.492 (b) 4.92 (c) 0.00492 (d) 0.0492
  28. 28.1.6 × 0.4 — where does the decimal point go? (a) 0.64 (b) 0.064 (c) 6.4 (d) 0.0064
  29. 29.9.8 × 4.4 — where does the decimal point go? (a) 431.2 (b) 43.12 (c) 4.312 (d) 0.4312
  30. 30.6.2 × 3 — where does the decimal point go? (a) 18.6 (b) 1.86 (c) 186 (d) 0.186
  31. 31.0.97 × 0.2 — where does the decimal point go? (a) 0.00194 (b) 1.94 (c) 0.0194 (d) 0.194
  32. 32.5.3 × 7 — where does the decimal point go? (a) 371 (b) 0.371 (c) 37.1 (d) 3.71
  33. 33.6.9 × 1.9 — where does the decimal point go? (a) 131.1 (b) 13.11 (c) 1.311 (d) 0.1311
  34. 34.0.94 × 3 — where does the decimal point go? (a) 0.282 (b) 28.2 (c) 2.82 (d) 0.0282
  35. 35.0.26 × 1.3 — where does the decimal point go? (a) 0.00338 (b) 3.38 (c) 0.0338 (d) 0.338
  36. 36.0.52 × 3.7 — where does the decimal point go? (a) 1.924 (b) 0.1924 (c) 0.01924 (d) 19.24
  37. 37.0.37 × 1.4 — where does the decimal point go? (a) 0.518 (b) 5.18 (c) 0.00518 (d) 0.0518
  38. 38.5.9 × 24 — where does the decimal point go? (a) 1416 (b) 141.6 (c) 14.16 (d) 1.416
  39. 39.4.6 × 2 — where does the decimal point go? (a) 9.2 (b) 92 (c) 0.92 (d) 0.092
  40. 40.0.15 × 0.7 — where does the decimal point go? (a) 0.00105 (b) 0.0105 (c) 1.05 (d) 0.105

Answer key

  1. 5.32
  2. 0.792
  3. 9.9
  4. 2.73
  5. 2.13
  6. 8.37
  7. 19.89
  8. 19.2
  9. 37.6
  10. 202.1
  11. 9.02
  12. 387.1
  13. 2.254
  14. 33.3
  15. 0.588
  16. 0.376
  17. 0.58
  18. 10.92
  19. 2.64
  20. 8.36
  21. 19.88
  22. 6.64
  23. 0.332
  24. 0.384
  25. 46.8
  26. 2.072
  27. 0.492
  28. 0.64
  29. 43.12
  30. 18.6
  31. 0.194
  32. 37.1
  33. 13.11
  34. 2.82
  35. 0.338
  36. 1.924
  37. 0.518
  38. 141.6
  39. 9.2
  40. 0.105

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