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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 101 · 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. 1.1.6 × 1.6 — where does the decimal point go? (a) 0.0256 (b) 0.256 (c) 2.56 (d) 25.6
  2. 2.2.5 × 3 — where does the decimal point go? (a) 0.75 (b) 75 (c) 0.075 (d) 7.5
  3. 3.0.49 × 2.9 — where does the decimal point go? (a) 0.01421 (b) 1.421 (c) 14.21 (d) 0.1421
  4. 4.9.3 × 0.3 — where does the decimal point go? (a) 0.279 (b) 0.0279 (c) 2.79 (d) 27.9
  5. 5.0.15 × 3 — where does the decimal point go? (a) 0.045 (b) 4.5 (c) 0.45 (d) 0.0045
  6. 6.7.8 × 8 — where does the decimal point go? (a) 624 (b) 0.624 (c) 6.24 (d) 62.4
  7. 7.2.6 × 27 — where does the decimal point go? (a) 0.702 (b) 702 (c) 7.02 (d) 70.2
  8. 8.5.1 × 2 — where does the decimal point go? (a) 1.02 (b) 0.102 (c) 10.2 (d) 102
  9. 9.8.7 × 8 — where does the decimal point go? (a) 69.6 (b) 6.96 (c) 0.696 (d) 696
  10. 10.2.6 × 6 — where does the decimal point go? (a) 156 (b) 15.6 (c) 1.56 (d) 0.156
  11. 11.2.1 × 29 — where does the decimal point go? (a) 6.09 (b) 0.609 (c) 60.9 (d) 609
  12. 12.5.1 × 0.7 — where does the decimal point go? (a) 3.57 (b) 0.0357 (c) 0.357 (d) 35.7
  13. 13.0.36 × 0.7 — where does the decimal point go? (a) 0.252 (b) 0.00252 (c) 2.52 (d) 0.0252
  14. 14.2.9 × 7 — where does the decimal point go? (a) 20.3 (b) 0.203 (c) 2.03 (d) 203
  15. 15.6.8 × 29 — where does the decimal point go? (a) 1.972 (b) 1972 (c) 19.72 (d) 197.2
  16. 16.5.3 × 0.4 — where does the decimal point go? (a) 0.212 (b) 21.2 (c) 2.12 (d) 0.0212
  17. 17.7.6 × 39 — where does the decimal point go? (a) 29.64 (b) 2.964 (c) 296.4 (d) 2964
  18. 18.0.85 × 0.5 — where does the decimal point go? (a) 4.25 (b) 0.425 (c) 0.0425 (d) 0.00425
  19. 19.0.73 × 8 — where does the decimal point go? (a) 5.84 (b) 0.584 (c) 0.0584 (d) 58.4
  20. 20.8.6 × 2 — where does the decimal point go? (a) 0.172 (b) 1.72 (c) 172 (d) 17.2
  21. 21.9.7 × 35 — where does the decimal point go? (a) 33.95 (b) 339.5 (c) 3.395 (d) 3395
  22. 22.2.5 × 1.5 — where does the decimal point go? (a) 0.0375 (b) 37.5 (c) 3.75 (d) 0.375
  23. 23.0.51 × 0.8 — where does the decimal point go? (a) 0.00408 (b) 4.08 (c) 0.0408 (d) 0.408
  24. 24.0.73 × 3.1 — where does the decimal point go? (a) 22.63 (b) 2.263 (c) 0.02263 (d) 0.2263
  25. 25.0.17 × 7 — where does the decimal point go? (a) 0.119 (b) 0.0119 (c) 11.9 (d) 1.19
  26. 26.4.8 × 21 — where does the decimal point go? (a) 10.08 (b) 1008 (c) 1.008 (d) 100.8
  27. 27.9.2 × 48 — where does the decimal point go? (a) 4416 (b) 44.16 (c) 4.416 (d) 441.6
  28. 28.0.54 × 3 — where does the decimal point go? (a) 16.2 (b) 1.62 (c) 0.162 (d) 0.0162
  29. 29.0.41 × 14 — where does the decimal point go? (a) 0.574 (b) 5.74 (c) 57.4 (d) 0.0574
  30. 30.5.4 × 8 — where does the decimal point go? (a) 4.32 (b) 43.2 (c) 432 (d) 0.432
  31. 31.4.7 × 0.4 — where does the decimal point go? (a) 18.8 (b) 0.0188 (c) 1.88 (d) 0.188
  32. 32.5.1 × 8 — where does the decimal point go? (a) 40.8 (b) 4.08 (c) 0.408 (d) 408
  33. 33.3.6 × 9 — where does the decimal point go? (a) 324 (b) 32.4 (c) 0.324 (d) 3.24
  34. 34.0.88 × 19 — where does the decimal point go? (a) 1.672 (b) 0.1672 (c) 16.72 (d) 167.2
  35. 35.0.94 × 0.4 — where does the decimal point go? (a) 0.376 (b) 3.76 (c) 0.00376 (d) 0.0376
  36. 36.8.3 × 0.5 — where does the decimal point go? (a) 4.15 (b) 0.0415 (c) 41.5 (d) 0.415
  37. 37.0.88 × 27 — where does the decimal point go? (a) 2.376 (b) 0.2376 (c) 23.76 (d) 237.6
  38. 38.6.7 × 4 — where does the decimal point go? (a) 268 (b) 0.268 (c) 2.68 (d) 26.8
  39. 39.0.79 × 45 — where does the decimal point go? (a) 355.5 (b) 0.3555 (c) 3.555 (d) 35.55
  40. 40.3.8 × 0.6 — where does the decimal point go? (a) 22.8 (b) 2.28 (c) 0.228 (d) 0.0228

Answer key

  1. 2.56
  2. 7.5
  3. 1.421
  4. 2.79
  5. 0.45
  6. 62.4
  7. 70.2
  8. 10.2
  9. 69.6
  10. 15.6
  11. 60.9
  12. 3.57
  13. 0.252
  14. 20.3
  15. 197.2
  16. 2.12
  17. 296.4
  18. 0.425
  19. 5.84
  20. 17.2
  21. 339.5
  22. 3.75
  23. 0.408
  24. 2.263
  25. 1.19
  26. 100.8
  27. 441.6
  28. 1.62
  29. 5.74
  30. 43.2
  31. 1.88
  32. 40.8
  33. 32.4
  34. 16.72
  35. 0.376
  36. 4.15
  37. 23.76
  38. 26.8
  39. 35.55
  40. 2.28

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