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VTMO 2013 — Grade 3 — semifinal Question 5

VTMO · VTMO 2013 — Grade 3 — semifinal

Question 5

How does $85$ change if the digit $2$ is placed to its left?
  1. It increases by $200$.
  2. It increases by $20$.
  3. It becomes $20$ times as large.
  4. It increases by $767$.
  5. It decreases by $20$.