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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 407 · 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. 1.0.53 × 0.3 — where does the decimal point go? (a) 0.0159 (b) 0.159 (c) 0.00159 (d) 1.59
  2. 2.0.22 × 27 — where does the decimal point go? (a) 0.0594 (b) 5.94 (c) 0.594 (d) 59.4
  3. 3.2.8 × 4.2 — where does the decimal point go? (a) 117.6 (b) 11.76 (c) 1.176 (d) 0.1176
  4. 4.7.4 × 3 — where does the decimal point go? (a) 0.222 (b) 22.2 (c) 222 (d) 2.22
  5. 5.0.99 × 3.1 — where does the decimal point go? (a) 30.69 (b) 0.3069 (c) 0.03069 (d) 3.069
  6. 6.0.49 × 8 — where does the decimal point go? (a) 0.392 (b) 39.2 (c) 0.0392 (d) 3.92
  7. 7.9.6 × 0.7 — where does the decimal point go? (a) 6.72 (b) 67.2 (c) 0.672 (d) 0.0672
  8. 8.5.2 × 18 — where does the decimal point go? (a) 93.6 (b) 0.936 (c) 9.36 (d) 936
  9. 9.0.55 × 7 — where does the decimal point go? (a) 3.85 (b) 0.385 (c) 0.0385 (d) 38.5
  10. 10.0.23 × 0.9 — where does the decimal point go? (a) 0.0207 (b) 0.207 (c) 2.07 (d) 0.00207
  11. 11.4.5 × 0.3 — where does the decimal point go? (a) 0.135 (b) 13.5 (c) 1.35 (d) 0.0135
  12. 12.1.5 × 9 — where does the decimal point go? (a) 13.5 (b) 0.135 (c) 135 (d) 1.35
  13. 13.0.32 × 4 — where does the decimal point go? (a) 1.28 (b) 0.0128 (c) 12.8 (d) 0.128
  14. 14.9.8 × 9 — where does the decimal point go? (a) 0.882 (b) 8.82 (c) 882 (d) 88.2
  15. 15.4.9 × 47 — where does the decimal point go? (a) 2303 (b) 230.3 (c) 2.303 (d) 23.03
  16. 16.0.31 × 3.8 — where does the decimal point go? (a) 1.178 (b) 0.01178 (c) 0.1178 (d) 11.78
  17. 17.7.1 × 9 — where does the decimal point go? (a) 0.639 (b) 6.39 (c) 63.9 (d) 639
  18. 18.0.47 × 26 — where does the decimal point go? (a) 0.1222 (b) 12.22 (c) 1.222 (d) 122.2
  19. 19.3.1 × 12 — where does the decimal point go? (a) 0.372 (b) 372 (c) 3.72 (d) 37.2
  20. 20.3.5 × 0.9 — where does the decimal point go? (a) 3.15 (b) 0.315 (c) 31.5 (d) 0.0315
  21. 21.0.24 × 27 — where does the decimal point go? (a) 6.48 (b) 0.648 (c) 64.8 (d) 0.0648
  22. 22.0.51 × 2.2 — where does the decimal point go? (a) 0.1122 (b) 1.122 (c) 11.22 (d) 0.01122
  23. 23.3.9 × 14 — where does the decimal point go? (a) 0.546 (b) 54.6 (c) 5.46 (d) 546
  24. 24.0.85 × 5 — where does the decimal point go? (a) 0.0425 (b) 4.25 (c) 0.425 (d) 42.5
  25. 25.5.4 × 9 — where does the decimal point go? (a) 48.6 (b) 4.86 (c) 0.486 (d) 486
  26. 26.1.4 × 2.9 — where does the decimal point go? (a) 0.406 (b) 4.06 (c) 40.6 (d) 0.0406
  27. 27.1.6 × 0.4 — where does the decimal point go? (a) 0.64 (b) 6.4 (c) 0.064 (d) 0.0064
  28. 28.0.73 × 0.6 — where does the decimal point go? (a) 4.38 (b) 0.438 (c) 0.00438 (d) 0.0438
  29. 29.6.2 × 3.6 — where does the decimal point go? (a) 223.2 (b) 2.232 (c) 0.2232 (d) 22.32
  30. 30.0.84 × 4 — where does the decimal point go? (a) 3.36 (b) 33.6 (c) 0.0336 (d) 0.336
  31. 31.8.4 × 11 — where does the decimal point go? (a) 9.24 (b) 0.924 (c) 92.4 (d) 924
  32. 32.0.86 × 16 — where does the decimal point go? (a) 0.1376 (b) 1.376 (c) 13.76 (d) 137.6
  33. 33.7.6 × 32 — where does the decimal point go? (a) 243.2 (b) 24.32 (c) 2.432 (d) 2432
  34. 34.7.9 × 0.3 — where does the decimal point go? (a) 2.37 (b) 0.0237 (c) 23.7 (d) 0.237
  35. 35.0.29 × 36 — where does the decimal point go? (a) 104.4 (b) 10.44 (c) 1.044 (d) 0.1044
  36. 36.0.94 × 34 — where does the decimal point go? (a) 31.96 (b) 0.3196 (c) 3.196 (d) 319.6
  37. 37.0.58 × 4.4 — where does the decimal point go? (a) 0.2552 (b) 2.552 (c) 25.52 (d) 0.02552
  38. 38.0.89 × 4.7 — where does the decimal point go? (a) 0.04183 (b) 4.183 (c) 0.4183 (d) 41.83
  39. 39.1.8 × 3.6 — where does the decimal point go? (a) 0.0648 (b) 0.648 (c) 6.48 (d) 64.8
  40. 40.3.2 × 2 — where does the decimal point go? (a) 0.64 (b) 64 (c) 0.064 (d) 6.4

Answer key

  1. 0.159
  2. 5.94
  3. 11.76
  4. 22.2
  5. 3.069
  6. 3.92
  7. 6.72
  8. 93.6
  9. 3.85
  10. 0.207
  11. 1.35
  12. 13.5
  13. 1.28
  14. 88.2
  15. 230.3
  16. 1.178
  17. 63.9
  18. 12.22
  19. 37.2
  20. 3.15
  21. 6.48
  22. 1.122
  23. 54.6
  24. 4.25
  25. 48.6
  26. 4.06
  27. 0.64
  28. 0.438
  29. 22.32
  30. 3.36
  31. 92.4
  32. 13.76
  33. 243.2
  34. 2.37
  35. 10.44
  36. 31.96
  37. 2.552
  38. 4.183
  39. 6.48
  40. 6.4

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