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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 402 · 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. 1.9.7 × 1.6 — where does the decimal point go? (a) 0.1552 (b) 1.552 (c) 15.52 (d) 155.2
  2. 2.1.6 × 3 — where does the decimal point go? (a) 4.8 (b) 0.48 (c) 0.048 (d) 48
  3. 3.0.16 × 8 — where does the decimal point go? (a) 12.8 (b) 1.28 (c) 0.128 (d) 0.0128
  4. 4.6.8 × 0.4 — where does the decimal point go? (a) 2.72 (b) 0.272 (c) 0.0272 (d) 27.2
  5. 5.0.83 × 21 — where does the decimal point go? (a) 0.1743 (b) 17.43 (c) 1.743 (d) 174.3
  6. 6.3.5 × 3.5 — where does the decimal point go? (a) 1.225 (b) 12.25 (c) 0.1225 (d) 122.5
  7. 7.3.8 × 0.2 — where does the decimal point go? (a) 0.76 (b) 7.6 (c) 0.076 (d) 0.0076
  8. 8.7.3 × 9 — where does the decimal point go? (a) 657 (b) 6.57 (c) 65.7 (d) 0.657
  9. 9.2.7 × 3.4 — where does the decimal point go? (a) 9.18 (b) 91.8 (c) 0.0918 (d) 0.918
  10. 10.5.7 × 2.5 — where does the decimal point go? (a) 142.5 (b) 14.25 (c) 0.1425 (d) 1.425
  11. 11.0.78 × 2.7 — where does the decimal point go? (a) 0.2106 (b) 0.02106 (c) 21.06 (d) 2.106
  12. 12.0.66 × 34 — where does the decimal point go? (a) 22.44 (b) 0.2244 (c) 224.4 (d) 2.244
  13. 13.5.3 × 2.5 — where does the decimal point go? (a) 132.5 (b) 13.25 (c) 1.325 (d) 0.1325
  14. 14.5.4 × 2.9 — where does the decimal point go? (a) 0.1566 (b) 156.6 (c) 1.566 (d) 15.66
  15. 15.2.8 × 41 — where does the decimal point go? (a) 11.48 (b) 114.8 (c) 1.148 (d) 1148
  16. 16.5.5 × 4.5 — where does the decimal point go? (a) 24.75 (b) 0.2475 (c) 247.5 (d) 2.475
  17. 17.9.3 × 5 — where does the decimal point go? (a) 46.5 (b) 0.465 (c) 4.65 (d) 465
  18. 18.4.4 × 12 — where does the decimal point go? (a) 528 (b) 5.28 (c) 52.8 (d) 0.528
  19. 19.0.75 × 0.5 — where does the decimal point go? (a) 0.375 (b) 3.75 (c) 0.0375 (d) 0.00375
  20. 20.0.94 × 0.8 — where does the decimal point go? (a) 0.00752 (b) 0.752 (c) 7.52 (d) 0.0752
  21. 21.5.6 × 16 — where does the decimal point go? (a) 89.6 (b) 0.896 (c) 8.96 (d) 896
  22. 22.0.51 × 0.8 — where does the decimal point go? (a) 0.00408 (b) 4.08 (c) 0.0408 (d) 0.408
  23. 23.5.8 × 0.7 — where does the decimal point go? (a) 0.0406 (b) 0.406 (c) 40.6 (d) 4.06
  24. 24.3.8 × 1.9 — where does the decimal point go? (a) 0.0722 (b) 7.22 (c) 72.2 (d) 0.722
  25. 25.3.1 × 17 — where does the decimal point go? (a) 52.7 (b) 5.27 (c) 527 (d) 0.527
  26. 26.4.4 × 0.3 — where does the decimal point go? (a) 1.32 (b) 0.0132 (c) 13.2 (d) 0.132
  27. 27.0.25 × 0.7 — where does the decimal point go? (a) 0.175 (b) 0.0175 (c) 1.75 (d) 0.00175
  28. 28.5.7 × 6 — where does the decimal point go? (a) 0.342 (b) 34.2 (c) 3.42 (d) 342
  29. 29.3.9 × 5 — where does the decimal point go? (a) 1.95 (b) 19.5 (c) 0.195 (d) 195
  30. 30.3.7 × 0.7 — where does the decimal point go? (a) 0.259 (b) 0.0259 (c) 2.59 (d) 25.9
  31. 31.0.55 × 0.5 — where does the decimal point go? (a) 0.0275 (b) 0.00275 (c) 0.275 (d) 2.75
  32. 32.0.63 × 43 — where does the decimal point go? (a) 0.2709 (b) 270.9 (c) 2.709 (d) 27.09
  33. 33.9.3 × 2.6 — where does the decimal point go? (a) 241.8 (b) 24.18 (c) 0.2418 (d) 2.418
  34. 34.0.54 × 3 — where does the decimal point go? (a) 0.0162 (b) 16.2 (c) 1.62 (d) 0.162
  35. 35.8.5 × 3.5 — where does the decimal point go? (a) 2.975 (b) 29.75 (c) 297.5 (d) 0.2975
  36. 36.0.83 × 2 — where does the decimal point go? (a) 1.66 (b) 0.166 (c) 16.6 (d) 0.0166
  37. 37.0.73 × 0.9 — where does the decimal point go? (a) 0.657 (b) 6.57 (c) 0.00657 (d) 0.0657
  38. 38.2.2 × 6 — where does the decimal point go? (a) 132 (b) 1.32 (c) 0.132 (d) 13.2
  39. 39.0.64 × 3.7 — where does the decimal point go? (a) 0.2368 (b) 23.68 (c) 2.368 (d) 0.02368
  40. 40.0.42 × 47 — where does the decimal point go? (a) 197.4 (b) 1.974 (c) 19.74 (d) 0.1974

Answer key

  1. 15.52
  2. 4.8
  3. 1.28
  4. 2.72
  5. 17.43
  6. 12.25
  7. 0.76
  8. 65.7
  9. 9.18
  10. 14.25
  11. 2.106
  12. 22.44
  13. 13.25
  14. 15.66
  15. 114.8
  16. 24.75
  17. 46.5
  18. 52.8
  19. 0.375
  20. 0.752
  21. 89.6
  22. 0.408
  23. 4.06
  24. 7.22
  25. 52.7
  26. 1.32
  27. 0.175
  28. 34.2
  29. 19.5
  30. 2.59
  31. 0.275
  32. 27.09
  33. 24.18
  34. 1.62
  35. 29.75
  36. 1.66
  37. 0.657
  38. 13.2
  39. 2.368
  40. 19.74

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