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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 789 · 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. 1.5.1 × 29 — where does the decimal point go? (a) 1.479 (b) 14.79 (c) 1479 (d) 147.9
  2. 2.1.3 × 46 — where does the decimal point go? (a) 598 (b) 5.98 (c) 59.8 (d) 0.598
  3. 3.0.57 × 1.9 — where does the decimal point go? (a) 1.083 (b) 0.1083 (c) 10.83 (d) 0.01083
  4. 4.0.22 × 7 — where does the decimal point go? (a) 1.54 (b) 0.154 (c) 0.0154 (d) 15.4
  5. 5.0.77 × 6 — where does the decimal point go? (a) 4.62 (b) 0.462 (c) 0.0462 (d) 46.2
  6. 6.0.72 × 1.3 — where does the decimal point go? (a) 0.00936 (b) 9.36 (c) 0.936 (d) 0.0936
  7. 7.9.2 × 0.3 — where does the decimal point go? (a) 27.6 (b) 2.76 (c) 0.276 (d) 0.0276
  8. 8.6.4 × 2 — where does the decimal point go? (a) 1.28 (b) 12.8 (c) 128 (d) 0.128
  9. 9.0.38 × 8 — where does the decimal point go? (a) 0.304 (b) 3.04 (c) 0.0304 (d) 30.4
  10. 10.8.5 × 0.9 — where does the decimal point go? (a) 0.0765 (b) 76.5 (c) 7.65 (d) 0.765
  11. 11.8.6 × 2.2 — where does the decimal point go? (a) 18.92 (b) 189.2 (c) 0.1892 (d) 1.892
  12. 12.4.7 × 17 — where does the decimal point go? (a) 7.99 (b) 799 (c) 0.799 (d) 79.9
  13. 13.0.28 × 4.7 — where does the decimal point go? (a) 1.316 (b) 13.16 (c) 0.1316 (d) 0.01316
  14. 14.9.6 × 19 — where does the decimal point go? (a) 182.4 (b) 18.24 (c) 1.824 (d) 1824
  15. 15.1.4 × 9 — where does the decimal point go? (a) 126 (b) 0.126 (c) 1.26 (d) 12.6
  16. 16.0.58 × 4.2 — where does the decimal point go? (a) 0.02436 (b) 24.36 (c) 0.2436 (d) 2.436
  17. 17.4.6 × 12 — where does the decimal point go? (a) 0.552 (b) 552 (c) 5.52 (d) 55.2
  18. 18.2.6 × 7 — where does the decimal point go? (a) 1.82 (b) 18.2 (c) 182 (d) 0.182
  19. 19.0.59 × 5 — where does the decimal point go? (a) 2.95 (b) 0.0295 (c) 0.295 (d) 29.5
  20. 20.8.2 × 11 — where does the decimal point go? (a) 0.902 (b) 9.02 (c) 90.2 (d) 902
  21. 21.0.12 × 4 — where does the decimal point go? (a) 0.048 (b) 4.8 (c) 0.48 (d) 0.0048
  22. 22.9.2 × 2.7 — where does the decimal point go? (a) 2.484 (b) 24.84 (c) 248.4 (d) 0.2484
  23. 23.0.26 × 2.1 — where does the decimal point go? (a) 0.0546 (b) 0.00546 (c) 0.546 (d) 5.46
  24. 24.3.4 × 4 — where does the decimal point go? (a) 13.6 (b) 1.36 (c) 0.136 (d) 136
  25. 25.0.59 × 6 — where does the decimal point go? (a) 0.354 (b) 0.0354 (c) 3.54 (d) 35.4
  26. 26.0.64 × 1.6 — where does the decimal point go? (a) 1.024 (b) 0.1024 (c) 10.24 (d) 0.01024
  27. 27.0.46 × 3.8 — where does the decimal point go? (a) 0.1748 (b) 17.48 (c) 1.748 (d) 0.01748
  28. 28.0.74 × 0.7 — where does the decimal point go? (a) 0.0518 (b) 0.00518 (c) 5.18 (d) 0.518
  29. 29.0.71 × 31 — where does the decimal point go? (a) 22.01 (b) 0.2201 (c) 220.1 (d) 2.201
  30. 30.0.57 × 5 — where does the decimal point go? (a) 2.85 (b) 28.5 (c) 0.285 (d) 0.0285
  31. 31.4.7 × 24 — where does the decimal point go? (a) 11.28 (b) 112.8 (c) 1.128 (d) 1128
  32. 32.0.89 × 0.9 — where does the decimal point go? (a) 8.01 (b) 0.00801 (c) 0.801 (d) 0.0801
  33. 33.0.66 × 11 — where does the decimal point go? (a) 0.0726 (b) 72.6 (c) 0.726 (d) 7.26
  34. 34.7.4 × 34 — where does the decimal point go? (a) 2516 (b) 2.516 (c) 251.6 (d) 25.16
  35. 35.0.98 × 3 — where does the decimal point go? (a) 29.4 (b) 2.94 (c) 0.0294 (d) 0.294
  36. 36.2.9 × 5 — where does the decimal point go? (a) 0.145 (b) 14.5 (c) 1.45 (d) 145
  37. 37.0.18 × 0.9 — where does the decimal point go? (a) 1.62 (b) 0.162 (c) 0.0162 (d) 0.00162
  38. 38.4.1 × 3 — where does the decimal point go? (a) 1.23 (b) 0.123 (c) 123 (d) 12.3
  39. 39.2.3 × 8 — where does the decimal point go? (a) 18.4 (b) 184 (c) 0.184 (d) 1.84
  40. 40.4.1 × 8 — where does the decimal point go? (a) 328 (b) 0.328 (c) 3.28 (d) 32.8

Answer key

  1. 147.9
  2. 59.8
  3. 1.083
  4. 1.54
  5. 4.62
  6. 0.936
  7. 2.76
  8. 12.8
  9. 3.04
  10. 7.65
  11. 18.92
  12. 79.9
  13. 1.316
  14. 182.4
  15. 12.6
  16. 2.436
  17. 55.2
  18. 18.2
  19. 2.95
  20. 90.2
  21. 0.48
  22. 24.84
  23. 0.546
  24. 13.6
  25. 3.54
  26. 1.024
  27. 1.748
  28. 0.518
  29. 22.01
  30. 2.85
  31. 112.8
  32. 0.801
  33. 7.26
  34. 251.6
  35. 2.94
  36. 14.5
  37. 0.162
  38. 12.3
  39. 18.4
  40. 32.8

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