VTMO 2026 - Grade 4 - Semifinal - SET 2 - Self-study Question 10

Question 10

Which calculation result is incorrect?

1. $1\times1\div1\times1=1$
2. $2\div2+2\div2=2$
3. $3\times3-3+3=3$
4. $(4-4)\div4+4=4$
5. $5+5\times(5-5)=5$