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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 136 · 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. 1.3.2 × 3.7 — where does the decimal point go? (a) 1.184 (b) 118.4 (c) 0.1184 (d) 11.84
  2. 2.2.8 × 3.7 — where does the decimal point go? (a) 0.1036 (b) 103.6 (c) 10.36 (d) 1.036
  3. 3.9.3 × 23 — where does the decimal point go? (a) 213.9 (b) 2139 (c) 2.139 (d) 21.39
  4. 4.0.48 × 2.1 — where does the decimal point go? (a) 0.01008 (b) 0.1008 (c) 10.08 (d) 1.008
  5. 5.0.32 × 1.1 — where does the decimal point go? (a) 0.0352 (b) 0.00352 (c) 0.352 (d) 3.52
  6. 6.0.77 × 46 — where does the decimal point go? (a) 3.542 (b) 354.2 (c) 35.42 (d) 0.3542
  7. 7.8.2 × 3 — where does the decimal point go? (a) 24.6 (b) 2.46 (c) 0.246 (d) 246
  8. 8.0.26 × 0.2 — where does the decimal point go? (a) 0.052 (b) 0.0052 (c) 0.00052 (d) 0.52
  9. 9.3.7 × 41 — where does the decimal point go? (a) 151.7 (b) 1517 (c) 15.17 (d) 1.517
  10. 10.3.2 × 9 — where does the decimal point go? (a) 28.8 (b) 2.88 (c) 288 (d) 0.288
  11. 11.2.1 × 6 — where does the decimal point go? (a) 12.6 (b) 1.26 (c) 0.126 (d) 126
  12. 12.3.6 × 0.3 — where does the decimal point go? (a) 1.08 (b) 0.0108 (c) 0.108 (d) 10.8
  13. 13.0.93 × 19 — where does the decimal point go? (a) 0.1767 (b) 17.67 (c) 1.767 (d) 176.7
  14. 14.0.13 × 29 — where does the decimal point go? (a) 3.77 (b) 0.377 (c) 37.7 (d) 0.0377
  15. 15.0.68 × 4 — where does the decimal point go? (a) 0.272 (b) 2.72 (c) 27.2 (d) 0.0272
  16. 16.6.8 × 44 — where does the decimal point go? (a) 2.992 (b) 29.92 (c) 2992 (d) 299.2
  17. 17.3.7 × 23 — where does the decimal point go? (a) 851 (b) 8.51 (c) 0.851 (d) 85.1
  18. 18.0.75 × 0.9 — where does the decimal point go? (a) 0.675 (b) 0.0675 (c) 0.00675 (d) 6.75
  19. 19.5.9 × 7 — where does the decimal point go? (a) 0.413 (b) 41.3 (c) 4.13 (d) 413
  20. 20.1.2 × 29 — where does the decimal point go? (a) 0.348 (b) 34.8 (c) 348 (d) 3.48
  21. 21.3.7 × 1.9 — where does the decimal point go? (a) 7.03 (b) 0.0703 (c) 0.703 (d) 70.3
  22. 22.4.7 × 5 — where does the decimal point go? (a) 0.235 (b) 2.35 (c) 23.5 (d) 235
  23. 23.4.4 × 3.8 — where does the decimal point go? (a) 167.2 (b) 1.672 (c) 0.1672 (d) 16.72
  24. 24.0.57 × 6 — where does the decimal point go? (a) 3.42 (b) 0.0342 (c) 34.2 (d) 0.342
  25. 25.0.41 × 0.8 — where does the decimal point go? (a) 0.328 (b) 3.28 (c) 0.0328 (d) 0.00328
  26. 26.0.59 × 12 — where does the decimal point go? (a) 7.08 (b) 70.8 (c) 0.0708 (d) 0.708
  27. 27.0.56 × 21 — where does the decimal point go? (a) 1.176 (b) 0.1176 (c) 11.76 (d) 117.6
  28. 28.0.49 × 39 — where does the decimal point go? (a) 1.911 (b) 0.1911 (c) 191.1 (d) 19.11
  29. 29.0.98 × 3 — where does the decimal point go? (a) 2.94 (b) 29.4 (c) 0.294 (d) 0.0294
  30. 30.0.55 × 2.9 — where does the decimal point go? (a) 1.595 (b) 0.01595 (c) 15.95 (d) 0.1595
  31. 31.8.7 × 0.4 — where does the decimal point go? (a) 34.8 (b) 0.0348 (c) 3.48 (d) 0.348
  32. 32.4.7 × 2.6 — where does the decimal point go? (a) 0.1222 (b) 122.2 (c) 12.22 (d) 1.222
  33. 33.8.2 × 9 — where does the decimal point go? (a) 73.8 (b) 7.38 (c) 0.738 (d) 738
  34. 34.6.9 × 39 — where does the decimal point go? (a) 269.1 (b) 26.91 (c) 2691 (d) 2.691
  35. 35.0.49 × 19 — where does the decimal point go? (a) 9.31 (b) 93.1 (c) 0.931 (d) 0.0931
  36. 36.6.9 × 3.6 — where does the decimal point go? (a) 0.2484 (b) 2.484 (c) 24.84 (d) 248.4
  37. 37.1.2 × 2.3 — where does the decimal point go? (a) 0.276 (b) 0.0276 (c) 2.76 (d) 27.6
  38. 38.0.95 × 5 — where does the decimal point go? (a) 0.475 (b) 4.75 (c) 47.5 (d) 0.0475
  39. 39.4.4 × 4.1 — where does the decimal point go? (a) 18.04 (b) 180.4 (c) 1.804 (d) 0.1804
  40. 40.0.47 × 2 — where does the decimal point go? (a) 0.94 (b) 0.094 (c) 9.4 (d) 0.0094

Answer key

  1. 11.84
  2. 10.36
  3. 213.9
  4. 1.008
  5. 0.352
  6. 35.42
  7. 24.6
  8. 0.052
  9. 151.7
  10. 28.8
  11. 12.6
  12. 1.08
  13. 17.67
  14. 3.77
  15. 2.72
  16. 299.2
  17. 85.1
  18. 0.675
  19. 41.3
  20. 34.8
  21. 7.03
  22. 23.5
  23. 16.72
  24. 3.42
  25. 0.328
  26. 7.08
  27. 11.76
  28. 19.11
  29. 2.94
  30. 1.595
  31. 3.48
  32. 12.22
  33. 73.8
  34. 269.1
  35. 9.31
  36. 24.84
  37. 2.76
  38. 4.75
  39. 18.04
  40. 0.94

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