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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 810 · 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. 1.0.13 × 15 — where does the decimal point go? (a) 0.0195 (b) 0.195 (c) 19.5 (d) 1.95
  2. 2.1.3 × 0.6 — where does the decimal point go? (a) 0.78 (b) 0.0078 (c) 7.8 (d) 0.078
  3. 3.0.92 × 6 — where does the decimal point go? (a) 5.52 (b) 0.552 (c) 0.0552 (d) 55.2
  4. 4.4.8 × 2.6 — where does the decimal point go? (a) 0.1248 (b) 1.248 (c) 12.48 (d) 124.8
  5. 5.0.13 × 41 — where does the decimal point go? (a) 53.3 (b) 0.533 (c) 0.0533 (d) 5.33
  6. 6.0.35 × 9 — where does the decimal point go? (a) 0.315 (b) 0.0315 (c) 31.5 (d) 3.15
  7. 7.6.2 × 4 — where does the decimal point go? (a) 2.48 (b) 0.248 (c) 248 (d) 24.8
  8. 8.4.9 × 17 — where does the decimal point go? (a) 8.33 (b) 83.3 (c) 0.833 (d) 833
  9. 9.5.3 × 3.7 — where does the decimal point go? (a) 1.961 (b) 19.61 (c) 196.1 (d) 0.1961
  10. 10.2.9 × 4.7 — where does the decimal point go? (a) 13.63 (b) 1.363 (c) 0.1363 (d) 136.3
  11. 11.2.4 × 0.9 — where does the decimal point go? (a) 2.16 (b) 0.216 (c) 21.6 (d) 0.0216
  12. 12.0.81 × 3.7 — where does the decimal point go? (a) 0.02997 (b) 0.2997 (c) 29.97 (d) 2.997
  13. 13.9.4 × 4.9 — where does the decimal point go? (a) 460.6 (b) 4.606 (c) 46.06 (d) 0.4606
  14. 14.0.83 × 0.3 — where does the decimal point go? (a) 0.0249 (b) 0.249 (c) 2.49 (d) 0.00249
  15. 15.2.5 × 0.3 — where does the decimal point go? (a) 0.0075 (b) 0.075 (c) 0.75 (d) 7.5
  16. 16.6.8 × 36 — where does the decimal point go? (a) 2.448 (b) 244.8 (c) 24.48 (d) 2448
  17. 17.0.15 × 11 — where does the decimal point go? (a) 1.65 (b) 0.0165 (c) 0.165 (d) 16.5
  18. 18.0.34 × 1.8 — where does the decimal point go? (a) 0.0612 (b) 6.12 (c) 0.00612 (d) 0.612
  19. 19.0.67 × 27 — where does the decimal point go? (a) 180.9 (b) 1.809 (c) 18.09 (d) 0.1809
  20. 20.0.31 × 23 — where does the decimal point go? (a) 7.13 (b) 71.3 (c) 0.713 (d) 0.0713
  21. 21.8.9 × 7 — where does the decimal point go? (a) 623 (b) 0.623 (c) 6.23 (d) 62.3
  22. 22.7.3 × 21 — where does the decimal point go? (a) 15.33 (b) 1533 (c) 153.3 (d) 1.533
  23. 23.0.51 × 4.9 — where does the decimal point go? (a) 0.02499 (b) 2.499 (c) 24.99 (d) 0.2499
  24. 24.0.91 × 0.5 — where does the decimal point go? (a) 0.0455 (b) 0.00455 (c) 4.55 (d) 0.455
  25. 25.8.4 × 7 — where does the decimal point go? (a) 58.8 (b) 5.88 (c) 588 (d) 0.588
  26. 26.2.6 × 3 — where does the decimal point go? (a) 7.8 (b) 0.78 (c) 0.078 (d) 78
  27. 27.0.18 × 3 — where does the decimal point go? (a) 5.4 (b) 0.0054 (c) 0.054 (d) 0.54
  28. 28.2.7 × 4 — where does the decimal point go? (a) 10.8 (b) 108 (c) 0.108 (d) 1.08
  29. 29.3.8 × 3 — where does the decimal point go? (a) 1.14 (b) 0.114 (c) 114 (d) 11.4
  30. 30.0.41 × 0.4 — where does the decimal point go? (a) 1.64 (b) 0.00164 (c) 0.164 (d) 0.0164
  31. 31.0.73 × 0.8 — where does the decimal point go? (a) 0.0584 (b) 0.584 (c) 5.84 (d) 0.00584
  32. 32.0.84 × 0.9 — where does the decimal point go? (a) 0.756 (b) 0.0756 (c) 0.00756 (d) 7.56
  33. 33.1.8 × 6 — where does the decimal point go? (a) 1.08 (b) 10.8 (c) 108 (d) 0.108
  34. 34.1.8 × 49 — where does the decimal point go? (a) 0.882 (b) 8.82 (c) 882 (d) 88.2
  35. 35.0.68 × 4 — where does the decimal point go? (a) 27.2 (b) 2.72 (c) 0.0272 (d) 0.272
  36. 36.0.81 × 48 — where does the decimal point go? (a) 0.3888 (b) 3.888 (c) 388.8 (d) 38.88
  37. 37.0.68 × 1.9 — where does the decimal point go? (a) 0.01292 (b) 1.292 (c) 12.92 (d) 0.1292
  38. 38.3.6 × 0.9 — where does the decimal point go? (a) 0.324 (b) 32.4 (c) 3.24 (d) 0.0324
  39. 39.0.55 × 2.3 — where does the decimal point go? (a) 1.265 (b) 0.01265 (c) 12.65 (d) 0.1265
  40. 40.0.47 × 0.9 — where does the decimal point go? (a) 0.0423 (b) 0.423 (c) 0.00423 (d) 4.23

Answer key

  1. 1.95
  2. 0.78
  3. 5.52
  4. 12.48
  5. 5.33
  6. 3.15
  7. 24.8
  8. 83.3
  9. 19.61
  10. 13.63
  11. 2.16
  12. 2.997
  13. 46.06
  14. 0.249
  15. 0.75
  16. 244.8
  17. 1.65
  18. 0.612
  19. 18.09
  20. 7.13
  21. 62.3
  22. 153.3
  23. 2.499
  24. 0.455
  25. 58.8
  26. 7.8
  27. 0.54
  28. 10.8
  29. 11.4
  30. 0.164
  31. 0.584
  32. 0.756
  33. 10.8
  34. 88.2
  35. 2.72
  36. 38.88
  37. 1.292
  38. 3.24
  39. 1.265
  40. 0.423

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