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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 25 · 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. 1.7.9 × 9 — where does the decimal point go? (a) 7.11 (b) 711 (c) 71.1 (d) 0.711
  2. 2.0.93 × 32 — where does the decimal point go? (a) 297.6 (b) 0.2976 (c) 29.76 (d) 2.976
  3. 3.5.1 × 0.3 — where does the decimal point go? (a) 15.3 (b) 1.53 (c) 0.153 (d) 0.0153
  4. 4.0.87 × 0.7 — where does the decimal point go? (a) 0.00609 (b) 6.09 (c) 0.0609 (d) 0.609
  5. 5.2.6 × 49 — where does the decimal point go? (a) 127.4 (b) 12.74 (c) 1.274 (d) 1274
  6. 6.0.33 × 1.5 — where does the decimal point go? (a) 0.0495 (b) 0.00495 (c) 4.95 (d) 0.495
  7. 7.9.1 × 22 — where does the decimal point go? (a) 20.02 (b) 2.002 (c) 200.2 (d) 2002
  8. 8.9.8 × 0.7 — where does the decimal point go? (a) 6.86 (b) 68.6 (c) 0.686 (d) 0.0686
  9. 9.1.4 × 2.2 — where does the decimal point go? (a) 0.308 (b) 30.8 (c) 0.0308 (d) 3.08
  10. 10.0.47 × 0.6 — where does the decimal point go? (a) 0.0282 (b) 0.00282 (c) 0.282 (d) 2.82
  11. 11.0.83 × 0.6 — where does the decimal point go? (a) 0.0498 (b) 0.498 (c) 4.98 (d) 0.00498
  12. 12.0.56 × 41 — where does the decimal point go? (a) 22.96 (b) 0.2296 (c) 2.296 (d) 229.6
  13. 13.9.6 × 4.6 — where does the decimal point go? (a) 4.416 (b) 44.16 (c) 0.4416 (d) 441.6
  14. 14.0.94 × 3 — where does the decimal point go? (a) 2.82 (b) 28.2 (c) 0.282 (d) 0.0282
  15. 15.3.5 × 0.9 — where does the decimal point go? (a) 3.15 (b) 0.315 (c) 0.0315 (d) 31.5
  16. 16.2.7 × 0.3 — where does the decimal point go? (a) 0.81 (b) 0.081 (c) 8.1 (d) 0.0081
  17. 17.7.9 × 7 — where does the decimal point go? (a) 0.553 (b) 5.53 (c) 553 (d) 55.3
  18. 18.1.6 × 7 — where does the decimal point go? (a) 1.12 (b) 11.2 (c) 0.112 (d) 112
  19. 19.0.82 × 44 — where does the decimal point go? (a) 36.08 (b) 0.3608 (c) 3.608 (d) 360.8
  20. 20.3.8 × 2 — where does the decimal point go? (a) 76 (b) 7.6 (c) 0.076 (d) 0.76
  21. 21.0.98 × 4.3 — where does the decimal point go? (a) 42.14 (b) 0.04214 (c) 4.214 (d) 0.4214
  22. 22.1.7 × 4 — where does the decimal point go? (a) 0.68 (b) 0.068 (c) 68 (d) 6.8
  23. 23.0.86 × 24 — where does the decimal point go? (a) 20.64 (b) 206.4 (c) 0.2064 (d) 2.064
  24. 24.0.86 × 2.2 — where does the decimal point go? (a) 0.1892 (b) 1.892 (c) 0.01892 (d) 18.92
  25. 25.5.5 × 35 — where does the decimal point go? (a) 1.925 (b) 1925 (c) 19.25 (d) 192.5
  26. 26.0.64 × 0.4 — where does the decimal point go? (a) 0.256 (b) 0.0256 (c) 2.56 (d) 0.00256
  27. 27.0.84 × 7 — where does the decimal point go? (a) 5.88 (b) 0.588 (c) 0.0588 (d) 58.8
  28. 28.6.9 × 2.2 — where does the decimal point go? (a) 151.8 (b) 0.1518 (c) 15.18 (d) 1.518
  29. 29.0.94 × 24 — where does the decimal point go? (a) 22.56 (b) 225.6 (c) 0.2256 (d) 2.256
  30. 30.9.8 × 4 — where does the decimal point go? (a) 392 (b) 3.92 (c) 39.2 (d) 0.392
  31. 31.5.7 × 47 — where does the decimal point go? (a) 26.79 (b) 267.9 (c) 2679 (d) 2.679
  32. 32.0.47 × 11 — where does the decimal point go? (a) 0.517 (b) 0.0517 (c) 5.17 (d) 51.7
  33. 33.3.8 × 0.9 — where does the decimal point go? (a) 34.2 (b) 0.0342 (c) 3.42 (d) 0.342
  34. 34.2.2 × 9 — where does the decimal point go? (a) 0.198 (b) 19.8 (c) 1.98 (d) 198
  35. 35.5.2 × 2.1 — where does the decimal point go? (a) 109.2 (b) 10.92 (c) 0.1092 (d) 1.092
  36. 36.0.93 × 0.9 — where does the decimal point go? (a) 0.00837 (b) 8.37 (c) 0.0837 (d) 0.837
  37. 37.0.68 × 0.6 — where does the decimal point go? (a) 0.408 (b) 0.00408 (c) 0.0408 (d) 4.08
  38. 38.0.41 × 0.7 — where does the decimal point go? (a) 0.287 (b) 0.0287 (c) 0.00287 (d) 2.87
  39. 39.3.7 × 6 — where does the decimal point go? (a) 222 (b) 22.2 (c) 2.22 (d) 0.222
  40. 40.0.23 × 21 — where does the decimal point go? (a) 4.83 (b) 0.0483 (c) 0.483 (d) 48.3

Answer key

  1. 71.1
  2. 29.76
  3. 1.53
  4. 0.609
  5. 127.4
  6. 0.495
  7. 200.2
  8. 6.86
  9. 3.08
  10. 0.282
  11. 0.498
  12. 22.96
  13. 44.16
  14. 2.82
  15. 3.15
  16. 0.81
  17. 55.3
  18. 11.2
  19. 36.08
  20. 7.6
  21. 4.214
  22. 6.8
  23. 20.64
  24. 1.892
  25. 192.5
  26. 0.256
  27. 5.88
  28. 15.18
  29. 22.56
  30. 39.2
  31. 267.9
  32. 5.17
  33. 3.42
  34. 19.8
  35. 10.92
  36. 0.837
  37. 0.408
  38. 0.287
  39. 22.2
  40. 4.83

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