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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 685 · 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. 1.9.9 × 4.5 — where does the decimal point go? (a) 0.4455 (b) 4.455 (c) 44.55 (d) 445.5
  2. 2.6.9 × 18 — where does the decimal point go? (a) 1.242 (b) 12.42 (c) 1242 (d) 124.2
  3. 3.6.3 × 0.6 — where does the decimal point go? (a) 3.78 (b) 37.8 (c) 0.0378 (d) 0.378
  4. 4.4.3 × 5 — where does the decimal point go? (a) 0.215 (b) 215 (c) 21.5 (d) 2.15
  5. 5.9.7 × 47 — where does the decimal point go? (a) 45.59 (b) 4559 (c) 455.9 (d) 4.559
  6. 6.0.16 × 0.3 — where does the decimal point go? (a) 0.48 (b) 0.00048 (c) 0.048 (d) 0.0048
  7. 7.0.91 × 1.8 — where does the decimal point go? (a) 0.01638 (b) 16.38 (c) 1.638 (d) 0.1638
  8. 8.1.9 × 3.8 — where does the decimal point go? (a) 72.2 (b) 0.722 (c) 7.22 (d) 0.0722
  9. 9.0.91 × 0.7 — where does the decimal point go? (a) 0.00637 (b) 0.637 (c) 6.37 (d) 0.0637
  10. 10.3.5 × 0.9 — where does the decimal point go? (a) 0.0315 (b) 3.15 (c) 31.5 (d) 0.315
  11. 11.4.3 × 11 — where does the decimal point go? (a) 0.473 (b) 47.3 (c) 4.73 (d) 473
  12. 12.7.5 × 19 — where does the decimal point go? (a) 14.25 (b) 1.425 (c) 142.5 (d) 1425
  13. 13.2.9 × 0.9 — where does the decimal point go? (a) 26.1 (b) 0.0261 (c) 2.61 (d) 0.261
  14. 14.8.2 × 3 — where does the decimal point go? (a) 24.6 (b) 0.246 (c) 2.46 (d) 246
  15. 15.9.2 × 4.8 — where does the decimal point go? (a) 441.6 (b) 4.416 (c) 0.4416 (d) 44.16
  16. 16.0.69 × 0.4 — where does the decimal point go? (a) 0.0276 (b) 0.276 (c) 2.76 (d) 0.00276
  17. 17.0.24 × 1.4 — where does the decimal point go? (a) 0.00336 (b) 0.336 (c) 3.36 (d) 0.0336
  18. 18.3.6 × 0.3 — where does the decimal point go? (a) 1.08 (b) 0.0108 (c) 10.8 (d) 0.108
  19. 19.0.79 × 3 — where does the decimal point go? (a) 0.0237 (b) 23.7 (c) 2.37 (d) 0.237
  20. 20.4.2 × 7 — where does the decimal point go? (a) 2.94 (b) 29.4 (c) 0.294 (d) 294
  21. 21.0.84 × 2.6 — where does the decimal point go? (a) 0.2184 (b) 0.02184 (c) 21.84 (d) 2.184
  22. 22.0.51 × 42 — where does the decimal point go? (a) 0.2142 (b) 21.42 (c) 2.142 (d) 214.2
  23. 23.8.4 × 8 — where does the decimal point go? (a) 6.72 (b) 672 (c) 67.2 (d) 0.672
  24. 24.0.31 × 2 — where does the decimal point go? (a) 0.62 (b) 0.0062 (c) 0.062 (d) 6.2
  25. 25.1.2 × 11 — where does the decimal point go? (a) 13.2 (b) 0.132 (c) 1.32 (d) 132
  26. 26.5.9 × 3.2 — where does the decimal point go? (a) 0.1888 (b) 1.888 (c) 188.8 (d) 18.88
  27. 27.4.3 × 32 — where does the decimal point go? (a) 1376 (b) 13.76 (c) 137.6 (d) 1.376
  28. 28.0.26 × 0.8 — where does the decimal point go? (a) 2.08 (b) 0.0208 (c) 0.208 (d) 0.00208
  29. 29.1.2 × 27 — where does the decimal point go? (a) 3.24 (b) 324 (c) 32.4 (d) 0.324
  30. 30.5.1 × 3 — where does the decimal point go? (a) 1.53 (b) 15.3 (c) 153 (d) 0.153
  31. 31.0.53 × 0.7 — where does the decimal point go? (a) 3.71 (b) 0.00371 (c) 0.371 (d) 0.0371
  32. 32.8.1 × 17 — where does the decimal point go? (a) 13.77 (b) 137.7 (c) 1.377 (d) 1377
  33. 33.0.56 × 24 — where does the decimal point go? (a) 134.4 (b) 1.344 (c) 0.1344 (d) 13.44
  34. 34.7.5 × 0.7 — where does the decimal point go? (a) 0.0525 (b) 0.525 (c) 52.5 (d) 5.25
  35. 35.0.61 × 0.5 — where does the decimal point go? (a) 0.00305 (b) 0.305 (c) 3.05 (d) 0.0305
  36. 36.3.9 × 27 — where does the decimal point go? (a) 1.053 (b) 1053 (c) 105.3 (d) 10.53
  37. 37.0.85 × 3 — where does the decimal point go? (a) 2.55 (b) 0.0255 (c) 0.255 (d) 25.5
  38. 38.0.38 × 2 — where does the decimal point go? (a) 0.076 (b) 0.76 (c) 0.0076 (d) 7.6
  39. 39.2.2 × 32 — where does the decimal point go? (a) 70.4 (b) 0.704 (c) 7.04 (d) 704
  40. 40.0.29 × 6 — where does the decimal point go? (a) 17.4 (b) 0.174 (c) 0.0174 (d) 1.74

Answer key

  1. 44.55
  2. 124.2
  3. 3.78
  4. 21.5
  5. 455.9
  6. 0.048
  7. 1.638
  8. 7.22
  9. 0.637
  10. 3.15
  11. 47.3
  12. 142.5
  13. 2.61
  14. 24.6
  15. 44.16
  16. 0.276
  17. 0.336
  18. 1.08
  19. 2.37
  20. 29.4
  21. 2.184
  22. 21.42
  23. 67.2
  24. 0.62
  25. 13.2
  26. 18.88
  27. 137.6
  28. 0.208
  29. 32.4
  30. 15.3
  31. 0.371
  32. 137.7
  33. 13.44
  34. 5.25
  35. 0.305
  36. 105.3
  37. 2.55
  38. 0.76
  39. 70.4
  40. 1.74

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