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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 841 · 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. 1.8.6 × 3.9 — where does the decimal point go? (a) 33.54 (b) 3.354 (c) 0.3354 (d) 335.4
  2. 2.0.99 × 13 — where does the decimal point go? (a) 12.87 (b) 0.1287 (c) 128.7 (d) 1.287
  3. 3.0.83 × 6 — where does the decimal point go? (a) 4.98 (b) 0.0498 (c) 0.498 (d) 49.8
  4. 4.0.34 × 0.3 — where does the decimal point go? (a) 0.102 (b) 1.02 (c) 0.00102 (d) 0.0102
  5. 5.4.5 × 49 — where does the decimal point go? (a) 2.205 (b) 220.5 (c) 2205 (d) 22.05
  6. 6.0.57 × 4.2 — where does the decimal point go? (a) 2.394 (b) 0.2394 (c) 23.94 (d) 0.02394
  7. 7.0.28 × 7 — where does the decimal point go? (a) 1.96 (b) 19.6 (c) 0.196 (d) 0.0196
  8. 8.9.1 × 48 — where does the decimal point go? (a) 436.8 (b) 4368 (c) 43.68 (d) 4.368
  9. 9.8.4 × 46 — where does the decimal point go? (a) 3.864 (b) 3864 (c) 386.4 (d) 38.64
  10. 10.6.2 × 7 — where does the decimal point go? (a) 43.4 (b) 4.34 (c) 0.434 (d) 434
  11. 11.0.87 × 0.2 — where does the decimal point go? (a) 0.174 (b) 1.74 (c) 0.0174 (d) 0.00174
  12. 12.0.54 × 0.6 — where does the decimal point go? (a) 0.00324 (b) 0.0324 (c) 3.24 (d) 0.324
  13. 13.7.6 × 1.8 — where does the decimal point go? (a) 136.8 (b) 0.1368 (c) 13.68 (d) 1.368
  14. 14.9.8 × 1.2 — where does the decimal point go? (a) 11.76 (b) 117.6 (c) 0.1176 (d) 1.176
  15. 15.7.3 × 9 — where does the decimal point go? (a) 65.7 (b) 6.57 (c) 0.657 (d) 657
  16. 16.9.7 × 2 — where does the decimal point go? (a) 0.194 (b) 19.4 (c) 1.94 (d) 194
  17. 17.0.24 × 16 — where does the decimal point go? (a) 0.0384 (b) 3.84 (c) 38.4 (d) 0.384
  18. 18.3.7 × 4 — where does the decimal point go? (a) 0.148 (b) 14.8 (c) 148 (d) 1.48
  19. 19.0.47 × 4 — where does the decimal point go? (a) 1.88 (b) 18.8 (c) 0.188 (d) 0.0188
  20. 20.0.64 × 0.6 — where does the decimal point go? (a) 0.00384 (b) 3.84 (c) 0.384 (d) 0.0384
  21. 21.7.8 × 29 — where does the decimal point go? (a) 22.62 (b) 2262 (c) 226.2 (d) 2.262
  22. 22.7.4 × 4 — where does the decimal point go? (a) 2.96 (b) 296 (c) 0.296 (d) 29.6
  23. 23.0.15 × 41 — where does the decimal point go? (a) 0.615 (b) 6.15 (c) 61.5 (d) 0.0615
  24. 24.0.82 × 0.8 — where does the decimal point go? (a) 0.00656 (b) 0.656 (c) 0.0656 (d) 6.56
  25. 25.9.7 × 21 — where does the decimal point go? (a) 203.7 (b) 20.37 (c) 2.037 (d) 2037
  26. 26.0.76 × 12 — where does the decimal point go? (a) 0.0912 (b) 0.912 (c) 91.2 (d) 9.12
  27. 27.0.57 × 7 — where does the decimal point go? (a) 0.399 (b) 0.0399 (c) 39.9 (d) 3.99
  28. 28.0.99 × 36 — where does the decimal point go? (a) 0.3564 (b) 35.64 (c) 3.564 (d) 356.4
  29. 29.5.3 × 1.4 — where does the decimal point go? (a) 7.42 (b) 0.742 (c) 0.0742 (d) 74.2
  30. 30.0.61 × 0.4 — where does the decimal point go? (a) 0.0244 (b) 0.00244 (c) 2.44 (d) 0.244
  31. 31.8.9 × 3.9 — where does the decimal point go? (a) 347.1 (b) 3.471 (c) 34.71 (d) 0.3471
  32. 32.0.97 × 7 — where does the decimal point go? (a) 0.679 (b) 67.9 (c) 6.79 (d) 0.0679
  33. 33.4.6 × 37 — where does the decimal point go? (a) 170.2 (b) 17.02 (c) 1.702 (d) 1702
  34. 34.9.7 × 23 — where does the decimal point go? (a) 22.31 (b) 2.231 (c) 223.1 (d) 2231
  35. 35.0.38 × 44 — where does the decimal point go? (a) 167.2 (b) 1.672 (c) 0.1672 (d) 16.72
  36. 36.0.67 × 4 — where does the decimal point go? (a) 2.68 (b) 0.268 (c) 26.8 (d) 0.0268
  37. 37.2.3 × 2.1 — where does the decimal point go? (a) 48.3 (b) 0.483 (c) 0.0483 (d) 4.83
  38. 38.0.37 × 0.4 — where does the decimal point go? (a) 0.00148 (b) 0.148 (c) 1.48 (d) 0.0148
  39. 39.1.2 × 27 — where does the decimal point go? (a) 324 (b) 0.324 (c) 3.24 (d) 32.4
  40. 40.5.6 × 0.2 — where does the decimal point go? (a) 11.2 (b) 0.112 (c) 1.12 (d) 0.0112

Answer key

  1. 33.54
  2. 12.87
  3. 4.98
  4. 0.102
  5. 220.5
  6. 2.394
  7. 1.96
  8. 436.8
  9. 386.4
  10. 43.4
  11. 0.174
  12. 0.324
  13. 13.68
  14. 11.76
  15. 65.7
  16. 19.4
  17. 3.84
  18. 14.8
  19. 1.88
  20. 0.384
  21. 226.2
  22. 29.6
  23. 6.15
  24. 0.656
  25. 203.7
  26. 9.12
  27. 3.99
  28. 35.64
  29. 7.42
  30. 0.244
  31. 34.71
  32. 6.79
  33. 170.2
  34. 223.1
  35. 16.72
  36. 2.68
  37. 4.83
  38. 0.148
  39. 32.4
  40. 1.12

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