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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 924 · 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. 1.8.7 × 0.7 — where does the decimal point go? (a) 6.09 (b) 0.609 (c) 0.0609 (d) 60.9
  2. 2.5.3 × 48 — where does the decimal point go? (a) 2.544 (b) 2544 (c) 254.4 (d) 25.44
  3. 3.5.6 × 0.9 — where does the decimal point go? (a) 0.0504 (b) 50.4 (c) 5.04 (d) 0.504
  4. 4.8.9 × 0.2 — where does the decimal point go? (a) 0.178 (b) 1.78 (c) 0.0178 (d) 17.8
  5. 5.0.52 × 2.4 — where does the decimal point go? (a) 1.248 (b) 12.48 (c) 0.01248 (d) 0.1248
  6. 6.0.89 × 4.1 — where does the decimal point go? (a) 3.649 (b) 36.49 (c) 0.3649 (d) 0.03649
  7. 7.0.34 × 2.3 — where does the decimal point go? (a) 0.00782 (b) 7.82 (c) 0.0782 (d) 0.782
  8. 8.0.69 × 3.5 — where does the decimal point go? (a) 2.415 (b) 24.15 (c) 0.02415 (d) 0.2415
  9. 9.0.86 × 0.8 — where does the decimal point go? (a) 0.0688 (b) 0.688 (c) 0.00688 (d) 6.88
  10. 10.0.35 × 39 — where does the decimal point go? (a) 13.65 (b) 0.1365 (c) 136.5 (d) 1.365
  11. 11.0.74 × 17 — where does the decimal point go? (a) 125.8 (b) 0.1258 (c) 1.258 (d) 12.58
  12. 12.6.9 × 0.8 — where does the decimal point go? (a) 0.0552 (b) 5.52 (c) 55.2 (d) 0.552
  13. 13.5.2 × 22 — where does the decimal point go? (a) 11.44 (b) 114.4 (c) 1.144 (d) 1144
  14. 14.0.27 × 14 — where does the decimal point go? (a) 3.78 (b) 0.378 (c) 37.8 (d) 0.0378
  15. 15.8.6 × 21 — where does the decimal point go? (a) 1.806 (b) 180.6 (c) 18.06 (d) 1806
  16. 16.5.2 × 1.3 — where does the decimal point go? (a) 6.76 (b) 67.6 (c) 0.0676 (d) 0.676
  17. 17.0.35 × 2.1 — where does the decimal point go? (a) 7.35 (b) 0.0735 (c) 0.00735 (d) 0.735
  18. 18.0.41 × 7 — where does the decimal point go? (a) 28.7 (b) 2.87 (c) 0.287 (d) 0.0287
  19. 19.8.9 × 0.4 — where does the decimal point go? (a) 0.356 (b) 0.0356 (c) 3.56 (d) 35.6
  20. 20.4.8 × 9 — where does the decimal point go? (a) 432 (b) 4.32 (c) 43.2 (d) 0.432
  21. 21.8.3 × 3.8 — where does the decimal point go? (a) 31.54 (b) 3.154 (c) 315.4 (d) 0.3154
  22. 22.0.27 × 42 — where does the decimal point go? (a) 11.34 (b) 113.4 (c) 0.1134 (d) 1.134
  23. 23.0.31 × 0.7 — where does the decimal point go? (a) 0.00217 (b) 0.217 (c) 0.0217 (d) 2.17
  24. 24.2.2 × 7 — where does the decimal point go? (a) 1.54 (b) 15.4 (c) 154 (d) 0.154
  25. 25.9.6 × 0.9 — where does the decimal point go? (a) 0.0864 (b) 8.64 (c) 86.4 (d) 0.864
  26. 26.9.6 × 9 — where does the decimal point go? (a) 864 (b) 0.864 (c) 8.64 (d) 86.4
  27. 27.8.5 × 17 — where does the decimal point go? (a) 144.5 (b) 14.45 (c) 1.445 (d) 1445
  28. 28.2.9 × 42 — where does the decimal point go? (a) 1.218 (b) 121.8 (c) 12.18 (d) 1218
  29. 29.2.9 × 3.1 — where does the decimal point go? (a) 8.99 (b) 0.899 (c) 89.9 (d) 0.0899
  30. 30.0.68 × 0.8 — where does the decimal point go? (a) 0.544 (b) 0.0544 (c) 0.00544 (d) 5.44
  31. 31.9.1 × 0.5 — where does the decimal point go? (a) 4.55 (b) 0.0455 (c) 0.455 (d) 45.5
  32. 32.0.17 × 2.1 — where does the decimal point go? (a) 0.357 (b) 3.57 (c) 0.00357 (d) 0.0357
  33. 33.3.4 × 3 — where does the decimal point go? (a) 102 (b) 10.2 (c) 1.02 (d) 0.102
  34. 34.7.7 × 9 — where does the decimal point go? (a) 69.3 (b) 6.93 (c) 0.693 (d) 693
  35. 35.0.33 × 46 — where does the decimal point go? (a) 0.1518 (b) 151.8 (c) 15.18 (d) 1.518
  36. 36.9.2 × 21 — where does the decimal point go? (a) 1.932 (b) 19.32 (c) 1932 (d) 193.2
  37. 37.9.7 × 0.2 — where does the decimal point go? (a) 19.4 (b) 1.94 (c) 0.0194 (d) 0.194
  38. 38.6.8 × 0.8 — where does the decimal point go? (a) 5.44 (b) 0.544 (c) 54.4 (d) 0.0544
  39. 39.5.1 × 0.6 — where does the decimal point go? (a) 30.6 (b) 0.0306 (c) 0.306 (d) 3.06
  40. 40.3.2 × 1.8 — where does the decimal point go? (a) 0.576 (b) 5.76 (c) 0.0576 (d) 57.6

Answer key

  1. 6.09
  2. 254.4
  3. 5.04
  4. 1.78
  5. 1.248
  6. 3.649
  7. 0.782
  8. 2.415
  9. 0.688
  10. 13.65
  11. 12.58
  12. 5.52
  13. 114.4
  14. 3.78
  15. 180.6
  16. 6.76
  17. 0.735
  18. 2.87
  19. 3.56
  20. 43.2
  21. 31.54
  22. 11.34
  23. 0.217
  24. 15.4
  25. 8.64
  26. 86.4
  27. 144.5
  28. 121.8
  29. 8.99
  30. 0.544
  31. 4.55
  32. 0.357
  33. 10.2
  34. 69.3
  35. 15.18
  36. 193.2
  37. 1.94
  38. 5.44
  39. 3.06
  40. 5.76

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