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VTMO 2017 — Grade 4 — semifinal Question 2

VTMO · VTMO 2017 — Grade 4 — semifinal

Question 2

Thanh writes all two-digit numbers containing digit $4$. How many does she write?
  1. $10$
  2. $19$
  3. $20$
  4. $30$
  5. $18$