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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 377 · 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. 1.2.7 × 45 — where does the decimal point go? (a) 1215 (b) 121.5 (c) 1.215 (d) 12.15
  2. 2.1.9 × 0.2 — where does the decimal point go? (a) 0.038 (b) 3.8 (c) 0.38 (d) 0.0038
  3. 3.0.48 × 13 — where does the decimal point go? (a) 6.24 (b) 0.624 (c) 62.4 (d) 0.0624
  4. 4.9.2 × 0.4 — where does the decimal point go? (a) 36.8 (b) 3.68 (c) 0.368 (d) 0.0368
  5. 5.0.46 × 0.6 — where does the decimal point go? (a) 2.76 (b) 0.0276 (c) 0.276 (d) 0.00276
  6. 6.9.4 × 49 — where does the decimal point go? (a) 4.606 (b) 460.6 (c) 4606 (d) 46.06
  7. 7.0.76 × 0.8 — where does the decimal point go? (a) 0.0608 (b) 0.00608 (c) 0.608 (d) 6.08
  8. 8.7.4 × 42 — where does the decimal point go? (a) 3.108 (b) 310.8 (c) 3108 (d) 31.08
  9. 9.8.3 × 0.2 — where does the decimal point go? (a) 1.66 (b) 0.166 (c) 16.6 (d) 0.0166
  10. 10.1.5 × 0.9 — where does the decimal point go? (a) 0.135 (b) 1.35 (c) 0.0135 (d) 13.5
  11. 11.0.63 × 4 — where does the decimal point go? (a) 0.0252 (b) 2.52 (c) 25.2 (d) 0.252
  12. 12.2.1 × 3.3 — where does the decimal point go? (a) 6.93 (b) 69.3 (c) 0.0693 (d) 0.693
  13. 13.9.3 × 4.9 — where does the decimal point go? (a) 0.4557 (b) 4.557 (c) 455.7 (d) 45.57
  14. 14.0.28 × 2 — where does the decimal point go? (a) 0.056 (b) 0.56 (c) 0.0056 (d) 5.6
  15. 15.8.5 × 2.5 — where does the decimal point go? (a) 2.125 (b) 21.25 (c) 212.5 (d) 0.2125
  16. 16.0.35 × 0.3 — where does the decimal point go? (a) 1.05 (b) 0.105 (c) 0.00105 (d) 0.0105
  17. 17.0.52 × 18 — where does the decimal point go? (a) 0.0936 (b) 93.6 (c) 9.36 (d) 0.936
  18. 18.8.2 × 29 — where does the decimal point go? (a) 237.8 (b) 2.378 (c) 2378 (d) 23.78
  19. 19.5.8 × 4 — where does the decimal point go? (a) 0.232 (b) 2.32 (c) 23.2 (d) 232
  20. 20.0.68 × 0.8 — where does the decimal point go? (a) 0.0544 (b) 0.00544 (c) 0.544 (d) 5.44
  21. 21.0.34 × 33 — where does the decimal point go? (a) 0.1122 (b) 1.122 (c) 11.22 (d) 112.2
  22. 22.7.6 × 0.6 — where does the decimal point go? (a) 0.456 (b) 0.0456 (c) 45.6 (d) 4.56
  23. 23.3.7 × 34 — where does the decimal point go? (a) 125.8 (b) 1.258 (c) 12.58 (d) 1258
  24. 24.2.6 × 0.9 — where does the decimal point go? (a) 0.0234 (b) 0.234 (c) 23.4 (d) 2.34
  25. 25.6.9 × 17 — where does the decimal point go? (a) 117.3 (b) 11.73 (c) 1173 (d) 1.173
  26. 26.3.9 × 8 — where does the decimal point go? (a) 31.2 (b) 0.312 (c) 3.12 (d) 312
  27. 27.9.7 × 3 — where does the decimal point go? (a) 291 (b) 2.91 (c) 0.291 (d) 29.1
  28. 28.5.4 × 2 — where does the decimal point go? (a) 10.8 (b) 1.08 (c) 0.108 (d) 108
  29. 29.7.7 × 46 — where does the decimal point go? (a) 3542 (b) 35.42 (c) 354.2 (d) 3.542
  30. 30.9.7 × 33 — where does the decimal point go? (a) 3201 (b) 32.01 (c) 3.201 (d) 320.1
  31. 31.0.15 × 1.9 — where does the decimal point go? (a) 0.00285 (b) 2.85 (c) 0.285 (d) 0.0285
  32. 32.3.3 × 1.7 — where does the decimal point go? (a) 0.0561 (b) 5.61 (c) 0.561 (d) 56.1
  33. 33.6.3 × 9 — where does the decimal point go? (a) 56.7 (b) 0.567 (c) 567 (d) 5.67
  34. 34.3.4 × 2 — where does the decimal point go? (a) 6.8 (b) 68 (c) 0.068 (d) 0.68
  35. 35.6.9 × 2.6 — where does the decimal point go? (a) 0.1794 (b) 179.4 (c) 17.94 (d) 1.794
  36. 36.9.9 × 0.6 — where does the decimal point go? (a) 5.94 (b) 0.594 (c) 59.4 (d) 0.0594
  37. 37.4.1 × 46 — where does the decimal point go? (a) 18.86 (b) 1886 (c) 188.6 (d) 1.886
  38. 38.7.1 × 0.7 — where does the decimal point go? (a) 0.497 (b) 4.97 (c) 0.0497 (d) 49.7
  39. 39.0.12 × 3.3 — where does the decimal point go? (a) 3.96 (b) 0.0396 (c) 0.00396 (d) 0.396
  40. 40.2.8 × 8 — where does the decimal point go? (a) 0.224 (b) 22.4 (c) 2.24 (d) 224

Answer key

  1. 121.5
  2. 0.38
  3. 6.24
  4. 3.68
  5. 0.276
  6. 460.6
  7. 0.608
  8. 310.8
  9. 1.66
  10. 1.35
  11. 2.52
  12. 6.93
  13. 45.57
  14. 0.56
  15. 21.25
  16. 0.105
  17. 9.36
  18. 237.8
  19. 23.2
  20. 0.544
  21. 11.22
  22. 4.56
  23. 125.8
  24. 2.34
  25. 117.3
  26. 31.2
  27. 29.1
  28. 10.8
  29. 354.2
  30. 320.1
  31. 0.285
  32. 5.61
  33. 56.7
  34. 6.8
  35. 17.94
  36. 5.94
  37. 188.6
  38. 4.97
  39. 0.396
  40. 22.4

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