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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 65 · 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. 1.0.18 × 13 — where does the decimal point go? (a) 0.0234 (b) 0.234 (c) 23.4 (d) 2.34
  2. 2.4.4 × 42 — where does the decimal point go? (a) 1848 (b) 1.848 (c) 18.48 (d) 184.8
  3. 3.0.32 × 2 — where does the decimal point go? (a) 0.064 (b) 0.64 (c) 6.4 (d) 0.0064
  4. 4.5.3 × 8 — where does the decimal point go? (a) 424 (b) 0.424 (c) 42.4 (d) 4.24
  5. 5.2.7 × 5 — where does the decimal point go? (a) 135 (b) 0.135 (c) 13.5 (d) 1.35
  6. 6.4.1 × 0.6 — where does the decimal point go? (a) 0.246 (b) 24.6 (c) 2.46 (d) 0.0246
  7. 7.8.2 × 4.4 — where does the decimal point go? (a) 360.8 (b) 3.608 (c) 36.08 (d) 0.3608
  8. 8.0.97 × 0.2 — where does the decimal point go? (a) 0.194 (b) 0.0194 (c) 1.94 (d) 0.00194
  9. 9.8.4 × 29 — where does the decimal point go? (a) 243.6 (b) 2436 (c) 24.36 (d) 2.436
  10. 10.8.6 × 28 — where does the decimal point go? (a) 240.8 (b) 2.408 (c) 24.08 (d) 2408
  11. 11.5.1 × 32 — where does the decimal point go? (a) 16.32 (b) 1632 (c) 1.632 (d) 163.2
  12. 12.0.29 × 38 — where does the decimal point go? (a) 1.102 (b) 0.1102 (c) 110.2 (d) 11.02
  13. 13.0.71 × 0.4 — where does the decimal point go? (a) 2.84 (b) 0.00284 (c) 0.284 (d) 0.0284
  14. 14.0.57 × 3.8 — where does the decimal point go? (a) 0.02166 (b) 2.166 (c) 0.2166 (d) 21.66
  15. 15.0.37 × 4 — where does the decimal point go? (a) 0.0148 (b) 0.148 (c) 1.48 (d) 14.8
  16. 16.0.77 × 3 — where does the decimal point go? (a) 0.231 (b) 2.31 (c) 23.1 (d) 0.0231
  17. 17.6.4 × 19 — where does the decimal point go? (a) 12.16 (b) 121.6 (c) 1216 (d) 1.216
  18. 18.0.39 × 2 — where does the decimal point go? (a) 0.78 (b) 0.0078 (c) 7.8 (d) 0.078
  19. 19.2.5 × 1.5 — where does the decimal point go? (a) 0.0375 (b) 0.375 (c) 37.5 (d) 3.75
  20. 20.0.87 × 25 — where does the decimal point go? (a) 2.175 (b) 0.2175 (c) 21.75 (d) 217.5
  21. 21.0.33 × 35 — where does the decimal point go? (a) 11.55 (b) 1.155 (c) 115.5 (d) 0.1155
  22. 22.0.25 × 3 — where does the decimal point go? (a) 0.75 (b) 7.5 (c) 0.0075 (d) 0.075
  23. 23.3.9 × 0.6 — where does the decimal point go? (a) 23.4 (b) 0.234 (c) 0.0234 (d) 2.34
  24. 24.0.96 × 2.3 — where does the decimal point go? (a) 0.2208 (b) 22.08 (c) 2.208 (d) 0.02208
  25. 25.0.92 × 8 — where does the decimal point go? (a) 0.0736 (b) 0.736 (c) 7.36 (d) 73.6
  26. 26.8.6 × 1.7 — where does the decimal point go? (a) 0.1462 (b) 146.2 (c) 1.462 (d) 14.62
  27. 27.0.69 × 6 — where does the decimal point go? (a) 0.0414 (b) 4.14 (c) 0.414 (d) 41.4
  28. 28.0.37 × 0.3 — where does the decimal point go? (a) 1.11 (b) 0.111 (c) 0.0111 (d) 0.00111
  29. 29.7.1 × 2.4 — where does the decimal point go? (a) 1.704 (b) 0.1704 (c) 170.4 (d) 17.04
  30. 30.7.7 × 41 — where does the decimal point go? (a) 315.7 (b) 3.157 (c) 31.57 (d) 3157
  31. 31.7.8 × 6 — where does the decimal point go? (a) 4.68 (b) 46.8 (c) 0.468 (d) 468
  32. 32.9.3 × 6 — where does the decimal point go? (a) 55.8 (b) 5.58 (c) 558 (d) 0.558
  33. 33.0.48 × 0.3 — where does the decimal point go? (a) 0.0144 (b) 0.00144 (c) 0.144 (d) 1.44
  34. 34.0.34 × 4.3 — where does the decimal point go? (a) 14.62 (b) 0.01462 (c) 1.462 (d) 0.1462
  35. 35.8.2 × 7 — where does the decimal point go? (a) 574 (b) 0.574 (c) 5.74 (d) 57.4
  36. 36.6.2 × 0.3 — where does the decimal point go? (a) 18.6 (b) 1.86 (c) 0.0186 (d) 0.186
  37. 37.0.49 × 5 — where does the decimal point go? (a) 0.0245 (b) 0.245 (c) 24.5 (d) 2.45
  38. 38.2.2 × 4.2 — where does the decimal point go? (a) 92.4 (b) 0.924 (c) 0.0924 (d) 9.24
  39. 39.0.51 × 17 — where does the decimal point go? (a) 0.867 (b) 86.7 (c) 0.0867 (d) 8.67
  40. 40.5.6 × 8 — where does the decimal point go? (a) 448 (b) 4.48 (c) 0.448 (d) 44.8

Answer key

  1. 2.34
  2. 184.8
  3. 0.64
  4. 42.4
  5. 13.5
  6. 2.46
  7. 36.08
  8. 0.194
  9. 243.6
  10. 240.8
  11. 163.2
  12. 11.02
  13. 0.284
  14. 2.166
  15. 1.48
  16. 2.31
  17. 121.6
  18. 0.78
  19. 3.75
  20. 21.75
  21. 11.55
  22. 0.75
  23. 2.34
  24. 2.208
  25. 7.36
  26. 14.62
  27. 4.14
  28. 0.111
  29. 17.04
  30. 315.7
  31. 46.8
  32. 55.8
  33. 0.144
  34. 1.462
  35. 57.4
  36. 1.86
  37. 2.45
  38. 9.24
  39. 8.67
  40. 44.8

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