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VTMO 2015 — Grade 6 — semifinal Question 1

VTMO · VTMO 2015 — Grade 6 — semifinal

Question 1

Evaluate $1 + 2 - 3 + 4 + 5 - 6 + 7 + 8 - 9 + 10 + 11 - 12 + 13 + 14 - 15$.
  1. $18$
  2. $30$
  3. $36$
  4. $48$
  5. $50$