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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 245 · 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. 1.9.8 × 12 — where does the decimal point go? (a) 11.76 (b) 117.6 (c) 1176 (d) 1.176
  2. 2.0.15 × 9 — where does the decimal point go? (a) 0.0135 (b) 0.135 (c) 13.5 (d) 1.35
  3. 3.3.4 × 24 — where does the decimal point go? (a) 81.6 (b) 0.816 (c) 816 (d) 8.16
  4. 4.4.1 × 0.2 — where does the decimal point go? (a) 8.2 (b) 0.082 (c) 0.82 (d) 0.0082
  5. 5.0.61 × 3.7 — where does the decimal point go? (a) 22.57 (b) 0.2257 (c) 0.02257 (d) 2.257
  6. 6.0.28 × 2.7 — where does the decimal point go? (a) 0.756 (b) 7.56 (c) 0.0756 (d) 0.00756
  7. 7.3.3 × 1.1 — where does the decimal point go? (a) 0.363 (b) 36.3 (c) 0.0363 (d) 3.63
  8. 8.6.9 × 49 — where does the decimal point go? (a) 3381 (b) 3.381 (c) 338.1 (d) 33.81
  9. 9.0.33 × 4.3 — where does the decimal point go? (a) 1.419 (b) 14.19 (c) 0.1419 (d) 0.01419
  10. 10.8.1 × 2.4 — where does the decimal point go? (a) 19.44 (b) 0.1944 (c) 194.4 (d) 1.944
  11. 11.1.3 × 17 — where does the decimal point go? (a) 2.21 (b) 22.1 (c) 221 (d) 0.221
  12. 12.5.7 × 3 — where does the decimal point go? (a) 17.1 (b) 0.171 (c) 171 (d) 1.71
  13. 13.0.34 × 0.7 — where does the decimal point go? (a) 0.238 (b) 0.0238 (c) 2.38 (d) 0.00238
  14. 14.0.72 × 21 — where does the decimal point go? (a) 1.512 (b) 15.12 (c) 0.1512 (d) 151.2
  15. 15.0.54 × 1.1 — where does the decimal point go? (a) 0.0594 (b) 0.594 (c) 0.00594 (d) 5.94
  16. 16.0.91 × 3.8 — where does the decimal point go? (a) 0.03458 (b) 34.58 (c) 3.458 (d) 0.3458
  17. 17.0.52 × 4 — where does the decimal point go? (a) 0.0208 (b) 20.8 (c) 2.08 (d) 0.208
  18. 18.7.2 × 2 — where does the decimal point go? (a) 1.44 (b) 0.144 (c) 144 (d) 14.4
  19. 19.0.31 × 22 — where does the decimal point go? (a) 0.682 (b) 0.0682 (c) 6.82 (d) 68.2
  20. 20.4.3 × 2.2 — where does the decimal point go? (a) 0.946 (b) 94.6 (c) 9.46 (d) 0.0946
  21. 21.0.51 × 9 — where does the decimal point go? (a) 4.59 (b) 0.459 (c) 0.0459 (d) 45.9
  22. 22.0.91 × 0.2 — where does the decimal point go? (a) 0.182 (b) 0.0182 (c) 1.82 (d) 0.00182
  23. 23.0.23 × 1.3 — where does the decimal point go? (a) 0.299 (b) 2.99 (c) 0.0299 (d) 0.00299
  24. 24.0.55 × 3 — where does the decimal point go? (a) 0.165 (b) 0.0165 (c) 16.5 (d) 1.65
  25. 25.0.26 × 9 — where does the decimal point go? (a) 0.0234 (b) 23.4 (c) 0.234 (d) 2.34
  26. 26.0.68 × 9 — where does the decimal point go? (a) 61.2 (b) 6.12 (c) 0.612 (d) 0.0612
  27. 27.5.9 × 0.3 — where does the decimal point go? (a) 1.77 (b) 17.7 (c) 0.0177 (d) 0.177
  28. 28.2.9 × 45 — where does the decimal point go? (a) 1305 (b) 1.305 (c) 130.5 (d) 13.05
  29. 29.0.28 × 7 — where does the decimal point go? (a) 19.6 (b) 0.0196 (c) 0.196 (d) 1.96
  30. 30.0.39 × 6 — where does the decimal point go? (a) 0.234 (b) 23.4 (c) 2.34 (d) 0.0234
  31. 31.0.28 × 0.3 — where does the decimal point go? (a) 0.00084 (b) 0.0084 (c) 0.084 (d) 0.84
  32. 32.0.36 × 0.7 — where does the decimal point go? (a) 0.0252 (b) 0.00252 (c) 2.52 (d) 0.252
  33. 33.9.8 × 14 — where does the decimal point go? (a) 13.72 (b) 1372 (c) 137.2 (d) 1.372
  34. 34.8.7 × 4.2 — where does the decimal point go? (a) 0.3654 (b) 365.4 (c) 36.54 (d) 3.654
  35. 35.0.56 × 1.4 — where does the decimal point go? (a) 0.0784 (b) 0.00784 (c) 7.84 (d) 0.784
  36. 36.9.6 × 8 — where does the decimal point go? (a) 76.8 (b) 7.68 (c) 0.768 (d) 768
  37. 37.0.31 × 6 — where does the decimal point go? (a) 0.186 (b) 18.6 (c) 0.0186 (d) 1.86
  38. 38.4.2 × 0.9 — where does the decimal point go? (a) 0.0378 (b) 3.78 (c) 37.8 (d) 0.378
  39. 39.4.4 × 14 — where does the decimal point go? (a) 0.616 (b) 61.6 (c) 616 (d) 6.16
  40. 40.3.8 × 4.2 — where does the decimal point go? (a) 1.596 (b) 0.1596 (c) 159.6 (d) 15.96

Answer key

  1. 117.6
  2. 1.35
  3. 81.6
  4. 0.82
  5. 2.257
  6. 0.756
  7. 3.63
  8. 338.1
  9. 1.419
  10. 19.44
  11. 22.1
  12. 17.1
  13. 0.238
  14. 15.12
  15. 0.594
  16. 3.458
  17. 2.08
  18. 14.4
  19. 6.82
  20. 9.46
  21. 4.59
  22. 0.182
  23. 0.299
  24. 1.65
  25. 2.34
  26. 6.12
  27. 1.77
  28. 130.5
  29. 1.96
  30. 2.34
  31. 0.084
  32. 0.252
  33. 137.2
  34. 36.54
  35. 0.784
  36. 76.8
  37. 1.86
  38. 3.78
  39. 61.6
  40. 15.96

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