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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 323 · 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. 1.0.45 × 7 — where does the decimal point go? (a) 31.5 (b) 3.15 (c) 0.315 (d) 0.0315
  2. 2.0.88 × 0.7 — where does the decimal point go? (a) 0.616 (b) 0.0616 (c) 6.16 (d) 0.00616
  3. 3.4.9 × 4.4 — where does the decimal point go? (a) 2.156 (b) 215.6 (c) 21.56 (d) 0.2156
  4. 4.0.41 × 0.7 — where does the decimal point go? (a) 0.287 (b) 0.0287 (c) 0.00287 (d) 2.87
  5. 5.4.2 × 0.2 — where does the decimal point go? (a) 0.84 (b) 0.0084 (c) 8.4 (d) 0.084
  6. 6.9.8 × 0.3 — where does the decimal point go? (a) 0.0294 (b) 29.4 (c) 2.94 (d) 0.294
  7. 7.9.6 × 28 — where does the decimal point go? (a) 2688 (b) 2.688 (c) 26.88 (d) 268.8
  8. 8.4.7 × 0.7 — where does the decimal point go? (a) 0.0329 (b) 3.29 (c) 32.9 (d) 0.329
  9. 9.2.6 × 3.7 — where does the decimal point go? (a) 0.0962 (b) 9.62 (c) 96.2 (d) 0.962
  10. 10.5.5 × 0.3 — where does the decimal point go? (a) 1.65 (b) 0.165 (c) 16.5 (d) 0.0165
  11. 11.9.3 × 18 — where does the decimal point go? (a) 1.674 (b) 1674 (c) 167.4 (d) 16.74
  12. 12.9.9 × 32 — where does the decimal point go? (a) 316.8 (b) 3168 (c) 31.68 (d) 3.168
  13. 13.0.17 × 4.2 — where does the decimal point go? (a) 0.0714 (b) 0.714 (c) 0.00714 (d) 7.14
  14. 14.9.5 × 1.3 — where does the decimal point go? (a) 12.35 (b) 123.5 (c) 1.235 (d) 0.1235
  15. 15.2.3 × 16 — where does the decimal point go? (a) 36.8 (b) 3.68 (c) 368 (d) 0.368
  16. 16.7.1 × 0.5 — where does the decimal point go? (a) 3.55 (b) 0.0355 (c) 0.355 (d) 35.5
  17. 17.0.57 × 0.7 — where does the decimal point go? (a) 0.399 (b) 0.00399 (c) 0.0399 (d) 3.99
  18. 18.3.1 × 0.8 — where does the decimal point go? (a) 0.0248 (b) 24.8 (c) 2.48 (d) 0.248
  19. 19.9.8 × 3 — where does the decimal point go? (a) 29.4 (b) 294 (c) 0.294 (d) 2.94
  20. 20.0.16 × 2.7 — where does the decimal point go? (a) 0.0432 (b) 0.00432 (c) 4.32 (d) 0.432
  21. 21.0.76 × 1.8 — where does the decimal point go? (a) 13.68 (b) 0.01368 (c) 1.368 (d) 0.1368
  22. 22.0.33 × 1.8 — where does the decimal point go? (a) 5.94 (b) 0.00594 (c) 0.594 (d) 0.0594
  23. 23.0.78 × 46 — where does the decimal point go? (a) 0.3588 (b) 3.588 (c) 358.8 (d) 35.88
  24. 24.0.12 × 2.1 — where does the decimal point go? (a) 0.252 (b) 0.0252 (c) 0.00252 (d) 2.52
  25. 25.6.8 × 4 — where does the decimal point go? (a) 0.272 (b) 2.72 (c) 272 (d) 27.2
  26. 26.1.9 × 2 — where does the decimal point go? (a) 0.038 (b) 38 (c) 3.8 (d) 0.38
  27. 27.3.7 × 0.8 — where does the decimal point go? (a) 0.0296 (b) 2.96 (c) 29.6 (d) 0.296
  28. 28.0.51 × 8 — where does the decimal point go? (a) 0.0408 (b) 0.408 (c) 4.08 (d) 40.8
  29. 29.9.1 × 3.8 — where does the decimal point go? (a) 3.458 (b) 34.58 (c) 345.8 (d) 0.3458
  30. 30.0.58 × 8 — where does the decimal point go? (a) 46.4 (b) 0.0464 (c) 4.64 (d) 0.464
  31. 31.0.34 × 4 — where does the decimal point go? (a) 13.6 (b) 1.36 (c) 0.0136 (d) 0.136
  32. 32.5.9 × 2 — where does the decimal point go? (a) 1.18 (b) 118 (c) 0.118 (d) 11.8
  33. 33.3.9 × 4 — where does the decimal point go? (a) 15.6 (b) 156 (c) 1.56 (d) 0.156
  34. 34.3.7 × 3.5 — where does the decimal point go? (a) 0.1295 (b) 1.295 (c) 129.5 (d) 12.95
  35. 35.4.6 × 0.4 — where does the decimal point go? (a) 1.84 (b) 18.4 (c) 0.184 (d) 0.0184
  36. 36.3.9 × 23 — where does the decimal point go? (a) 0.897 (b) 8.97 (c) 89.7 (d) 897
  37. 37.0.83 × 3.8 — where does the decimal point go? (a) 3.154 (b) 0.03154 (c) 0.3154 (d) 31.54
  38. 38.2.6 × 31 — where does the decimal point go? (a) 806 (b) 8.06 (c) 0.806 (d) 80.6
  39. 39.0.88 × 2.8 — where does the decimal point go? (a) 0.02464 (b) 2.464 (c) 0.2464 (d) 24.64
  40. 40.0.92 × 0.9 — where does the decimal point go? (a) 0.828 (b) 0.0828 (c) 8.28 (d) 0.00828

Answer key

  1. 3.15
  2. 0.616
  3. 21.56
  4. 0.287
  5. 0.84
  6. 2.94
  7. 268.8
  8. 3.29
  9. 9.62
  10. 1.65
  11. 167.4
  12. 316.8
  13. 0.714
  14. 12.35
  15. 36.8
  16. 3.55
  17. 0.399
  18. 2.48
  19. 29.4
  20. 0.432
  21. 1.368
  22. 0.594
  23. 35.88
  24. 0.252
  25. 27.2
  26. 3.8
  27. 2.96
  28. 4.08
  29. 34.58
  30. 4.64
  31. 1.36
  32. 11.8
  33. 15.6
  34. 12.95
  35. 1.84
  36. 89.7
  37. 3.154
  38. 80.6
  39. 2.464
  40. 0.828

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