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HKIMO 2026 Grade 4 National Preliminary Set 05 Question 9

HKIMO · HKIMO 2026 Grade 4 National Preliminary Set 05

Question 9

Find the value of $100-95+90-85+80-75+\cdots+10-5$.
  1. 100
  2. 50
  3. 45
  4. 40