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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 79 · 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. 1.0.97 × 0.5 — where does the decimal point go? (a) 0.485 (b) 0.00485 (c) 0.0485 (d) 4.85
  2. 2.0.46 × 2.9 — where does the decimal point go? (a) 13.34 (b) 1.334 (c) 0.01334 (d) 0.1334
  3. 3.0.91 × 0.4 — where does the decimal point go? (a) 0.00364 (b) 0.0364 (c) 3.64 (d) 0.364
  4. 4.0.99 × 0.4 — where does the decimal point go? (a) 0.00396 (b) 3.96 (c) 0.396 (d) 0.0396
  5. 5.0.26 × 2 — where does the decimal point go? (a) 0.052 (b) 0.0052 (c) 5.2 (d) 0.52
  6. 6.3.9 × 13 — where does the decimal point go? (a) 0.507 (b) 50.7 (c) 507 (d) 5.07
  7. 7.0.59 × 32 — where does the decimal point go? (a) 188.8 (b) 1.888 (c) 0.1888 (d) 18.88
  8. 8.0.61 × 0.4 — where does the decimal point go? (a) 0.00244 (b) 0.0244 (c) 2.44 (d) 0.244
  9. 9.0.49 × 0.6 — where does the decimal point go? (a) 0.00294 (b) 0.294 (c) 2.94 (d) 0.0294
  10. 10.1.7 × 0.4 — where does the decimal point go? (a) 6.8 (b) 0.0068 (c) 0.068 (d) 0.68
  11. 11.0.43 × 18 — where does the decimal point go? (a) 0.0774 (b) 77.4 (c) 0.774 (d) 7.74
  12. 12.6.5 × 3.9 — where does the decimal point go? (a) 0.2535 (b) 253.5 (c) 25.35 (d) 2.535
  13. 13.0.34 × 8 — where does the decimal point go? (a) 0.272 (b) 0.0272 (c) 2.72 (d) 27.2
  14. 14.6.1 × 9 — where does the decimal point go? (a) 5.49 (b) 549 (c) 0.549 (d) 54.9
  15. 15.3.5 × 0.9 — where does the decimal point go? (a) 31.5 (b) 0.315 (c) 0.0315 (d) 3.15
  16. 16.0.96 × 0.4 — where does the decimal point go? (a) 0.00384 (b) 3.84 (c) 0.384 (d) 0.0384
  17. 17.0.12 × 39 — where does the decimal point go? (a) 4.68 (b) 0.0468 (c) 0.468 (d) 46.8
  18. 18.4.1 × 5 — where does the decimal point go? (a) 2.05 (b) 0.205 (c) 205 (d) 20.5
  19. 19.2.3 × 9 — where does the decimal point go? (a) 2.07 (b) 207 (c) 20.7 (d) 0.207
  20. 20.2.4 × 48 — where does the decimal point go? (a) 1.152 (b) 115.2 (c) 1152 (d) 11.52
  21. 21.8.2 × 18 — where does the decimal point go? (a) 147.6 (b) 14.76 (c) 1476 (d) 1.476
  22. 22.0.22 × 4 — where does the decimal point go? (a) 8.8 (b) 0.0088 (c) 0.88 (d) 0.088
  23. 23.0.42 × 0.7 — where does the decimal point go? (a) 0.294 (b) 0.00294 (c) 2.94 (d) 0.0294
  24. 24.0.91 × 2 — where does the decimal point go? (a) 1.82 (b) 0.182 (c) 18.2 (d) 0.0182
  25. 25.7.5 × 0.5 — where does the decimal point go? (a) 37.5 (b) 0.0375 (c) 0.375 (d) 3.75
  26. 26.0.84 × 4 — where does the decimal point go? (a) 0.0336 (b) 33.6 (c) 3.36 (d) 0.336
  27. 27.0.17 × 18 — where does the decimal point go? (a) 30.6 (b) 0.0306 (c) 0.306 (d) 3.06
  28. 28.7.6 × 2 — where does the decimal point go? (a) 152 (b) 1.52 (c) 0.152 (d) 15.2
  29. 29.0.13 × 31 — where does the decimal point go? (a) 40.3 (b) 0.0403 (c) 4.03 (d) 0.403
  30. 30.8.1 × 4 — where does the decimal point go? (a) 3.24 (b) 0.324 (c) 324 (d) 32.4
  31. 31.0.87 × 7 — where does the decimal point go? (a) 6.09 (b) 0.609 (c) 60.9 (d) 0.0609
  32. 32.0.47 × 24 — where does the decimal point go? (a) 0.1128 (b) 112.8 (c) 1.128 (d) 11.28
  33. 33.9.4 × 1.1 — where does the decimal point go? (a) 0.1034 (b) 103.4 (c) 10.34 (d) 1.034
  34. 34.0.32 × 8 — where does the decimal point go? (a) 0.0256 (b) 0.256 (c) 2.56 (d) 25.6
  35. 35.1.7 × 3 — where does the decimal point go? (a) 0.051 (b) 51 (c) 5.1 (d) 0.51
  36. 36.0.54 × 0.6 — where does the decimal point go? (a) 0.324 (b) 0.0324 (c) 3.24 (d) 0.00324
  37. 37.7.6 × 12 — where does the decimal point go? (a) 0.912 (b) 91.2 (c) 9.12 (d) 912
  38. 38.0.98 × 7 — where does the decimal point go? (a) 0.686 (b) 68.6 (c) 6.86 (d) 0.0686
  39. 39.0.69 × 29 — where does the decimal point go? (a) 20.01 (b) 200.1 (c) 0.2001 (d) 2.001
  40. 40.9.6 × 2 — where does the decimal point go? (a) 19.2 (b) 0.192 (c) 192 (d) 1.92

Answer key

  1. 0.485
  2. 1.334
  3. 0.364
  4. 0.396
  5. 0.52
  6. 50.7
  7. 18.88
  8. 0.244
  9. 0.294
  10. 0.68
  11. 7.74
  12. 25.35
  13. 2.72
  14. 54.9
  15. 3.15
  16. 0.384
  17. 4.68
  18. 20.5
  19. 20.7
  20. 115.2
  21. 147.6
  22. 0.88
  23. 0.294
  24. 1.82
  25. 3.75
  26. 3.36
  27. 3.06
  28. 15.2
  29. 4.03
  30. 32.4
  31. 6.09
  32. 11.28
  33. 10.34
  34. 2.56
  35. 5.1
  36. 0.324
  37. 91.2
  38. 6.86
  39. 20.01
  40. 19.2

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