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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 401 · 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. 1.4.3 × 0.2 — where does the decimal point go? (a) 8.6 (b) 0.86 (c) 0.086 (d) 0.0086
  2. 2.0.92 × 0.2 — where does the decimal point go? (a) 0.00184 (b) 0.184 (c) 0.0184 (d) 1.84
  3. 3.8.7 × 3.9 — where does the decimal point go? (a) 3.393 (b) 33.93 (c) 339.3 (d) 0.3393
  4. 4.6.8 × 2 — where does the decimal point go? (a) 0.136 (b) 136 (c) 1.36 (d) 13.6
  5. 5.3.6 × 37 — where does the decimal point go? (a) 133.2 (b) 1332 (c) 1.332 (d) 13.32
  6. 6.8.2 × 3.8 — where does the decimal point go? (a) 0.3116 (b) 3.116 (c) 311.6 (d) 31.16
  7. 7.0.58 × 9 — where does the decimal point go? (a) 52.2 (b) 5.22 (c) 0.0522 (d) 0.522
  8. 8.5.1 × 0.8 — where does the decimal point go? (a) 4.08 (b) 40.8 (c) 0.408 (d) 0.0408
  9. 9.4.8 × 1.4 — where does the decimal point go? (a) 67.2 (b) 6.72 (c) 0.672 (d) 0.0672
  10. 10.7.5 × 3 — where does the decimal point go? (a) 22.5 (b) 0.225 (c) 225 (d) 2.25
  11. 11.0.76 × 0.3 — where does the decimal point go? (a) 0.228 (b) 0.00228 (c) 2.28 (d) 0.0228
  12. 12.8.3 × 3 — where does the decimal point go? (a) 0.249 (b) 249 (c) 24.9 (d) 2.49
  13. 13.5.7 × 5 — where does the decimal point go? (a) 285 (b) 28.5 (c) 2.85 (d) 0.285
  14. 14.5.7 × 9 — where does the decimal point go? (a) 5.13 (b) 513 (c) 51.3 (d) 0.513
  15. 15.1.9 × 46 — where does the decimal point go? (a) 874 (b) 0.874 (c) 87.4 (d) 8.74
  16. 16.0.79 × 3.2 — where does the decimal point go? (a) 2.528 (b) 0.2528 (c) 0.02528 (d) 25.28
  17. 17.0.59 × 0.2 — where does the decimal point go? (a) 0.118 (b) 0.00118 (c) 0.0118 (d) 1.18
  18. 18.6.1 × 0.6 — where does the decimal point go? (a) 3.66 (b) 0.0366 (c) 36.6 (d) 0.366
  19. 19.7.3 × 42 — where does the decimal point go? (a) 3066 (b) 3.066 (c) 30.66 (d) 306.6
  20. 20.9.1 × 5 — where does the decimal point go? (a) 455 (b) 4.55 (c) 45.5 (d) 0.455
  21. 21.7.8 × 6 — where does the decimal point go? (a) 468 (b) 0.468 (c) 46.8 (d) 4.68
  22. 22.1.9 × 2 — where does the decimal point go? (a) 38 (b) 0.038 (c) 0.38 (d) 3.8
  23. 23.0.61 × 4.6 — where does the decimal point go? (a) 0.2806 (b) 28.06 (c) 2.806 (d) 0.02806
  24. 24.9.6 × 3 — where does the decimal point go? (a) 0.288 (b) 288 (c) 2.88 (d) 28.8
  25. 25.7.3 × 4 — where does the decimal point go? (a) 292 (b) 29.2 (c) 2.92 (d) 0.292
  26. 26.4.2 × 9 — where does the decimal point go? (a) 37.8 (b) 0.378 (c) 378 (d) 3.78
  27. 27.0.54 × 0.7 — where does the decimal point go? (a) 0.0378 (b) 0.00378 (c) 0.378 (d) 3.78
  28. 28.8.1 × 2 — where does the decimal point go? (a) 162 (b) 16.2 (c) 0.162 (d) 1.62
  29. 29.0.55 × 3.9 — where does the decimal point go? (a) 0.02145 (b) 0.2145 (c) 2.145 (d) 21.45
  30. 30.0.43 × 3 — where does the decimal point go? (a) 0.0129 (b) 0.129 (c) 12.9 (d) 1.29
  31. 31.5.5 × 2.5 — where does the decimal point go? (a) 13.75 (b) 137.5 (c) 0.1375 (d) 1.375
  32. 32.0.99 × 2.2 — where does the decimal point go? (a) 21.78 (b) 0.02178 (c) 0.2178 (d) 2.178
  33. 33.6.7 × 2 — where does the decimal point go? (a) 13.4 (b) 134 (c) 1.34 (d) 0.134
  34. 34.0.31 × 6 — where does the decimal point go? (a) 0.0186 (b) 0.186 (c) 18.6 (d) 1.86
  35. 35.5.5 × 3 — where does the decimal point go? (a) 165 (b) 1.65 (c) 16.5 (d) 0.165
  36. 36.0.18 × 0.3 — where does the decimal point go? (a) 0.0054 (b) 0.054 (c) 0.00054 (d) 0.54
  37. 37.0.53 × 0.5 — where does the decimal point go? (a) 0.00265 (b) 0.265 (c) 2.65 (d) 0.0265
  38. 38.0.35 × 37 — where does the decimal point go? (a) 0.1295 (b) 129.5 (c) 12.95 (d) 1.295
  39. 39.0.87 × 33 — where does the decimal point go? (a) 0.2871 (b) 287.1 (c) 28.71 (d) 2.871
  40. 40.7.4 × 38 — where does the decimal point go? (a) 2812 (b) 281.2 (c) 2.812 (d) 28.12

Answer key

  1. 0.86
  2. 0.184
  3. 33.93
  4. 13.6
  5. 133.2
  6. 31.16
  7. 5.22
  8. 4.08
  9. 6.72
  10. 22.5
  11. 0.228
  12. 24.9
  13. 28.5
  14. 51.3
  15. 87.4
  16. 2.528
  17. 0.118
  18. 3.66
  19. 306.6
  20. 45.5
  21. 46.8
  22. 3.8
  23. 2.806
  24. 28.8
  25. 29.2
  26. 37.8
  27. 0.378
  28. 16.2
  29. 2.145
  30. 1.29
  31. 13.75
  32. 2.178
  33. 13.4
  34. 1.86
  35. 16.5
  36. 0.054
  37. 0.265
  38. 12.95
  39. 28.71
  40. 281.2

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