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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 81 · 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. 1.7.3 × 5 — where does the decimal point go? (a) 36.5 (b) 0.365 (c) 3.65 (d) 365
  2. 2.6.3 × 1.9 — where does the decimal point go? (a) 0.1197 (b) 1.197 (c) 119.7 (d) 11.97
  3. 3.8.5 × 0.3 — where does the decimal point go? (a) 25.5 (b) 2.55 (c) 0.0255 (d) 0.255
  4. 4.9.1 × 2.5 — where does the decimal point go? (a) 0.2275 (b) 22.75 (c) 227.5 (d) 2.275
  5. 5.0.49 × 0.9 — where does the decimal point go? (a) 0.441 (b) 4.41 (c) 0.0441 (d) 0.00441
  6. 6.0.19 × 25 — where does the decimal point go? (a) 47.5 (b) 4.75 (c) 0.0475 (d) 0.475
  7. 7.2.5 × 3.9 — where does the decimal point go? (a) 0.975 (b) 0.0975 (c) 9.75 (d) 97.5
  8. 8.0.72 × 0.3 — where does the decimal point go? (a) 0.0216 (b) 0.00216 (c) 2.16 (d) 0.216
  9. 9.0.69 × 17 — where does the decimal point go? (a) 1.173 (b) 0.1173 (c) 117.3 (d) 11.73
  10. 10.1.9 × 0.6 — where does the decimal point go? (a) 0.0114 (b) 11.4 (c) 1.14 (d) 0.114
  11. 11.3.8 × 11 — where does the decimal point go? (a) 418 (b) 4.18 (c) 41.8 (d) 0.418
  12. 12.0.68 × 13 — where does the decimal point go? (a) 0.884 (b) 8.84 (c) 0.0884 (d) 88.4
  13. 13.0.15 × 3 — where does the decimal point go? (a) 0.045 (b) 4.5 (c) 0.0045 (d) 0.45
  14. 14.1.6 × 0.6 — where does the decimal point go? (a) 0.0096 (b) 0.096 (c) 9.6 (d) 0.96
  15. 15.2.8 × 38 — where does the decimal point go? (a) 10.64 (b) 106.4 (c) 1.064 (d) 1064
  16. 16.9.3 × 0.7 — where does the decimal point go? (a) 0.651 (b) 0.0651 (c) 6.51 (d) 65.1
  17. 17.7.9 × 3 — where does the decimal point go? (a) 0.237 (b) 23.7 (c) 237 (d) 2.37
  18. 18.0.27 × 31 — where does the decimal point go? (a) 8.37 (b) 0.0837 (c) 0.837 (d) 83.7
  19. 19.0.28 × 37 — where does the decimal point go? (a) 0.1036 (b) 103.6 (c) 1.036 (d) 10.36
  20. 20.9.5 × 11 — where does the decimal point go? (a) 10.45 (b) 104.5 (c) 1.045 (d) 1045
  21. 21.9.3 × 0.4 — where does the decimal point go? (a) 0.0372 (b) 37.2 (c) 3.72 (d) 0.372
  22. 22.0.57 × 0.5 — where does the decimal point go? (a) 2.85 (b) 0.0285 (c) 0.00285 (d) 0.285
  23. 23.0.17 × 26 — where does the decimal point go? (a) 0.442 (b) 44.2 (c) 4.42 (d) 0.0442
  24. 24.0.68 × 19 — where does the decimal point go? (a) 1.292 (b) 129.2 (c) 0.1292 (d) 12.92
  25. 25.0.37 × 24 — where does the decimal point go? (a) 0.888 (b) 88.8 (c) 0.0888 (d) 8.88
  26. 26.0.88 × 0.8 — where does the decimal point go? (a) 7.04 (b) 0.00704 (c) 0.0704 (d) 0.704
  27. 27.0.42 × 28 — where does the decimal point go? (a) 117.6 (b) 11.76 (c) 0.1176 (d) 1.176
  28. 28.6.4 × 0.8 — where does the decimal point go? (a) 51.2 (b) 0.0512 (c) 0.512 (d) 5.12
  29. 29.0.21 × 1.8 — where does the decimal point go? (a) 0.0378 (b) 0.378 (c) 0.00378 (d) 3.78
  30. 30.6.5 × 7 — where does the decimal point go? (a) 0.455 (b) 455 (c) 45.5 (d) 4.55
  31. 31.0.42 × 0.2 — where does the decimal point go? (a) 0.084 (b) 0.0084 (c) 0.00084 (d) 0.84
  32. 32.0.94 × 46 — where does the decimal point go? (a) 432.4 (b) 4.324 (c) 43.24 (d) 0.4324
  33. 33.0.17 × 34 — where does the decimal point go? (a) 5.78 (b) 0.0578 (c) 0.578 (d) 57.8
  34. 34.2.5 × 0.7 — where does the decimal point go? (a) 0.0175 (b) 17.5 (c) 0.175 (d) 1.75
  35. 35.0.31 × 2 — where does the decimal point go? (a) 0.62 (b) 6.2 (c) 0.062 (d) 0.0062
  36. 36.3.2 × 42 — where does the decimal point go? (a) 1344 (b) 1.344 (c) 134.4 (d) 13.44
  37. 37.0.62 × 0.2 — where does the decimal point go? (a) 0.124 (b) 1.24 (c) 0.00124 (d) 0.0124
  38. 38.1.3 × 3.1 — where does the decimal point go? (a) 4.03 (b) 0.0403 (c) 40.3 (d) 0.403
  39. 39.4.4 × 1.2 — where does the decimal point go? (a) 52.8 (b) 5.28 (c) 0.528 (d) 0.0528
  40. 40.2.2 × 3 — where does the decimal point go? (a) 0.66 (b) 6.6 (c) 0.066 (d) 66

Answer key

  1. 36.5
  2. 11.97
  3. 2.55
  4. 22.75
  5. 0.441
  6. 4.75
  7. 9.75
  8. 0.216
  9. 11.73
  10. 1.14
  11. 41.8
  12. 8.84
  13. 0.45
  14. 0.96
  15. 106.4
  16. 6.51
  17. 23.7
  18. 8.37
  19. 10.36
  20. 104.5
  21. 3.72
  22. 0.285
  23. 4.42
  24. 12.92
  25. 8.88
  26. 0.704
  27. 11.76
  28. 5.12
  29. 0.378
  30. 45.5
  31. 0.084
  32. 43.24
  33. 5.78
  34. 1.75
  35. 0.62
  36. 134.4
  37. 0.124
  38. 4.03
  39. 5.28
  40. 6.6

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