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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 413 · 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. 1.0.93 × 3.4 — where does the decimal point go? (a) 3.162 (b) 0.03162 (c) 31.62 (d) 0.3162
  2. 2.5.9 × 3 — where does the decimal point go? (a) 0.177 (b) 177 (c) 17.7 (d) 1.77
  3. 3.0.28 × 42 — where does the decimal point go? (a) 11.76 (b) 117.6 (c) 1.176 (d) 0.1176
  4. 4.0.49 × 6 — where does the decimal point go? (a) 0.0294 (b) 29.4 (c) 0.294 (d) 2.94
  5. 5.0.35 × 9 — where does the decimal point go? (a) 0.0315 (b) 31.5 (c) 0.315 (d) 3.15
  6. 6.2.9 × 0.7 — where does the decimal point go? (a) 2.03 (b) 0.203 (c) 0.0203 (d) 20.3
  7. 7.0.39 × 0.8 — where does the decimal point go? (a) 0.312 (b) 0.0312 (c) 0.00312 (d) 3.12
  8. 8.7.2 × 6 — where does the decimal point go? (a) 4.32 (b) 0.432 (c) 432 (d) 43.2
  9. 9.0.88 × 2.2 — where does the decimal point go? (a) 19.36 (b) 0.1936 (c) 0.01936 (d) 1.936
  10. 10.0.89 × 0.2 — where does the decimal point go? (a) 0.00178 (b) 0.0178 (c) 1.78 (d) 0.178
  11. 11.8.3 × 5 — where does the decimal point go? (a) 41.5 (b) 415 (c) 4.15 (d) 0.415
  12. 12.0.86 × 9 — where does the decimal point go? (a) 0.0774 (b) 7.74 (c) 77.4 (d) 0.774
  13. 13.0.79 × 3 — where does the decimal point go? (a) 23.7 (b) 2.37 (c) 0.237 (d) 0.0237
  14. 14.0.93 × 3 — where does the decimal point go? (a) 0.279 (b) 2.79 (c) 0.0279 (d) 27.9
  15. 15.0.31 × 47 — where does the decimal point go? (a) 1.457 (b) 145.7 (c) 0.1457 (d) 14.57
  16. 16.1.4 × 21 — where does the decimal point go? (a) 29.4 (b) 0.294 (c) 2.94 (d) 294
  17. 17.4.3 × 7 — where does the decimal point go? (a) 30.1 (b) 0.301 (c) 301 (d) 3.01
  18. 18.4.3 × 26 — where does the decimal point go? (a) 111.8 (b) 1118 (c) 11.18 (d) 1.118
  19. 19.0.74 × 0.9 — where does the decimal point go? (a) 0.00666 (b) 0.0666 (c) 0.666 (d) 6.66
  20. 20.5.1 × 8 — where does the decimal point go? (a) 0.408 (b) 4.08 (c) 40.8 (d) 408
  21. 21.2.6 × 2.4 — where does the decimal point go? (a) 0.0624 (b) 0.624 (c) 6.24 (d) 62.4
  22. 22.3.5 × 1.1 — where does the decimal point go? (a) 0.385 (b) 38.5 (c) 3.85 (d) 0.0385
  23. 23.8.3 × 0.7 — where does the decimal point go? (a) 0.0581 (b) 5.81 (c) 58.1 (d) 0.581
  24. 24.0.13 × 8 — where does the decimal point go? (a) 1.04 (b) 0.0104 (c) 0.104 (d) 10.4
  25. 25.0.37 × 3.3 — where does the decimal point go? (a) 12.21 (b) 0.01221 (c) 0.1221 (d) 1.221
  26. 26.0.42 × 2.2 — where does the decimal point go? (a) 9.24 (b) 0.924 (c) 0.00924 (d) 0.0924
  27. 27.0.88 × 0.4 — where does the decimal point go? (a) 0.352 (b) 0.00352 (c) 3.52 (d) 0.0352
  28. 28.0.21 × 7 — where does the decimal point go? (a) 0.0147 (b) 1.47 (c) 14.7 (d) 0.147
  29. 29.0.44 × 2.2 — where does the decimal point go? (a) 9.68 (b) 0.0968 (c) 0.00968 (d) 0.968
  30. 30.0.64 × 27 — where does the decimal point go? (a) 0.1728 (b) 1.728 (c) 17.28 (d) 172.8
  31. 31.0.68 × 1.6 — where does the decimal point go? (a) 10.88 (b) 0.1088 (c) 0.01088 (d) 1.088
  32. 32.0.43 × 4 — where does the decimal point go? (a) 0.0172 (b) 0.172 (c) 17.2 (d) 1.72
  33. 33.7.4 × 0.6 — where does the decimal point go? (a) 4.44 (b) 0.0444 (c) 44.4 (d) 0.444
  34. 34.0.36 × 7 — where does the decimal point go? (a) 2.52 (b) 25.2 (c) 0.0252 (d) 0.252
  35. 35.0.21 × 0.4 — where does the decimal point go? (a) 0.84 (b) 0.084 (c) 0.00084 (d) 0.0084
  36. 36.9.6 × 0.4 — where does the decimal point go? (a) 0.0384 (b) 0.384 (c) 38.4 (d) 3.84
  37. 37.0.88 × 4 — where does the decimal point go? (a) 0.0352 (b) 35.2 (c) 0.352 (d) 3.52
  38. 38.1.6 × 0.2 — where does the decimal point go? (a) 0.32 (b) 3.2 (c) 0.0032 (d) 0.032
  39. 39.0.48 × 3 — where does the decimal point go? (a) 1.44 (b) 0.144 (c) 0.0144 (d) 14.4
  40. 40.8.2 × 0.6 — where does the decimal point go? (a) 0.0492 (b) 4.92 (c) 49.2 (d) 0.492

Answer key

  1. 3.162
  2. 17.7
  3. 11.76
  4. 2.94
  5. 3.15
  6. 2.03
  7. 0.312
  8. 43.2
  9. 1.936
  10. 0.178
  11. 41.5
  12. 7.74
  13. 2.37
  14. 2.79
  15. 14.57
  16. 29.4
  17. 30.1
  18. 111.8
  19. 0.666
  20. 40.8
  21. 6.24
  22. 3.85
  23. 5.81
  24. 1.04
  25. 1.221
  26. 0.924
  27. 0.352
  28. 1.47
  29. 0.968
  30. 17.28
  31. 1.088
  32. 1.72
  33. 4.44
  34. 2.52
  35. 0.084
  36. 3.84
  37. 3.52
  38. 0.32
  39. 1.44
  40. 4.92

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