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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 941 · 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. 1.7.2 × 4 — where does the decimal point go? (a) 288 (b) 2.88 (c) 0.288 (d) 28.8
  2. 2.1.5 × 0.7 — where does the decimal point go? (a) 0.105 (b) 0.0105 (c) 10.5 (d) 1.05
  3. 3.0.12 × 32 — where does the decimal point go? (a) 38.4 (b) 3.84 (c) 0.384 (d) 0.0384
  4. 4.6.7 × 2 — where does the decimal point go? (a) 1.34 (b) 134 (c) 13.4 (d) 0.134
  5. 5.0.91 × 13 — where does the decimal point go? (a) 0.1183 (b) 1.183 (c) 118.3 (d) 11.83
  6. 6.0.53 × 1.8 — where does the decimal point go? (a) 0.00954 (b) 9.54 (c) 0.0954 (d) 0.954
  7. 7.0.17 × 6 — where does the decimal point go? (a) 0.0102 (b) 10.2 (c) 0.102 (d) 1.02
  8. 8.6.7 × 18 — where does the decimal point go? (a) 1206 (b) 120.6 (c) 1.206 (d) 12.06
  9. 9.6.7 × 1.3 — where does the decimal point go? (a) 0.871 (b) 8.71 (c) 87.1 (d) 0.0871
  10. 10.0.33 × 0.4 — where does the decimal point go? (a) 0.132 (b) 0.0132 (c) 1.32 (d) 0.00132
  11. 11.8.3 × 0.8 — where does the decimal point go? (a) 6.64 (b) 0.664 (c) 0.0664 (d) 66.4
  12. 12.0.17 × 0.6 — where does the decimal point go? (a) 0.00102 (b) 0.102 (c) 0.0102 (d) 1.02
  13. 13.3.8 × 26 — where does the decimal point go? (a) 9.88 (b) 98.8 (c) 0.988 (d) 988
  14. 14.0.71 × 3.5 — where does the decimal point go? (a) 2.485 (b) 0.2485 (c) 0.02485 (d) 24.85
  15. 15.0.72 × 0.3 — where does the decimal point go? (a) 0.0216 (b) 0.216 (c) 0.00216 (d) 2.16
  16. 16.0.32 × 4 — where does the decimal point go? (a) 0.0128 (b) 12.8 (c) 1.28 (d) 0.128
  17. 17.0.96 × 7 — where does the decimal point go? (a) 6.72 (b) 0.0672 (c) 67.2 (d) 0.672
  18. 18.0.25 × 15 — where does the decimal point go? (a) 37.5 (b) 3.75 (c) 0.0375 (d) 0.375
  19. 19.0.64 × 0.3 — where does the decimal point go? (a) 1.92 (b) 0.192 (c) 0.0192 (d) 0.00192
  20. 20.0.14 × 2 — where does the decimal point go? (a) 2.8 (b) 0.0028 (c) 0.28 (d) 0.028
  21. 21.1.9 × 0.4 — where does the decimal point go? (a) 0.076 (b) 0.76 (c) 0.0076 (d) 7.6
  22. 22.2.3 × 47 — where does the decimal point go? (a) 1081 (b) 10.81 (c) 1.081 (d) 108.1
  23. 23.9.6 × 4 — where does the decimal point go? (a) 3.84 (b) 38.4 (c) 384 (d) 0.384
  24. 24.7.9 × 4.1 — where does the decimal point go? (a) 323.9 (b) 0.3239 (c) 32.39 (d) 3.239
  25. 25.0.52 × 9 — where does the decimal point go? (a) 0.0468 (b) 0.468 (c) 46.8 (d) 4.68
  26. 26.0.33 × 42 — where does the decimal point go? (a) 0.1386 (b) 138.6 (c) 1.386 (d) 13.86
  27. 27.1.2 × 0.2 — where does the decimal point go? (a) 0.024 (b) 2.4 (c) 0.24 (d) 0.0024
  28. 28.3.8 × 3 — where does the decimal point go? (a) 1.14 (b) 0.114 (c) 114 (d) 11.4
  29. 29.4.2 × 11 — where does the decimal point go? (a) 46.2 (b) 462 (c) 4.62 (d) 0.462
  30. 30.0.37 × 3 — where does the decimal point go? (a) 0.111 (b) 1.11 (c) 11.1 (d) 0.0111
  31. 31.3.1 × 3.3 — where does the decimal point go? (a) 102.3 (b) 1.023 (c) 0.1023 (d) 10.23
  32. 32.8.3 × 2 — where does the decimal point go? (a) 166 (b) 16.6 (c) 0.166 (d) 1.66
  33. 33.0.98 × 44 — where does the decimal point go? (a) 4.312 (b) 0.4312 (c) 43.12 (d) 431.2
  34. 34.0.66 × 4.6 — where does the decimal point go? (a) 0.3036 (b) 0.03036 (c) 30.36 (d) 3.036
  35. 35.6.6 × 0.8 — where does the decimal point go? (a) 0.0528 (b) 52.8 (c) 0.528 (d) 5.28
  36. 36.2.2 × 0.6 — where does the decimal point go? (a) 0.0132 (b) 0.132 (c) 1.32 (d) 13.2
  37. 37.2.2 × 17 — where does the decimal point go? (a) 3.74 (b) 37.4 (c) 0.374 (d) 374
  38. 38.0.87 × 5 — where does the decimal point go? (a) 0.435 (b) 0.0435 (c) 4.35 (d) 43.5
  39. 39.0.98 × 4 — where does the decimal point go? (a) 3.92 (b) 0.392 (c) 0.0392 (d) 39.2
  40. 40.0.82 × 3.6 — where does the decimal point go? (a) 29.52 (b) 0.2952 (c) 2.952 (d) 0.02952

Answer key

  1. 28.8
  2. 1.05
  3. 3.84
  4. 13.4
  5. 11.83
  6. 0.954
  7. 1.02
  8. 120.6
  9. 8.71
  10. 0.132
  11. 6.64
  12. 0.102
  13. 98.8
  14. 2.485
  15. 0.216
  16. 1.28
  17. 6.72
  18. 3.75
  19. 0.192
  20. 0.28
  21. 0.76
  22. 108.1
  23. 38.4
  24. 32.39
  25. 4.68
  26. 13.86
  27. 0.24
  28. 11.4
  29. 46.2
  30. 1.11
  31. 10.23
  32. 16.6
  33. 43.12
  34. 3.036
  35. 5.28
  36. 1.32
  37. 37.4
  38. 4.35
  39. 3.92
  40. 2.952

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