Question

Which of the following is true?

• A. 2 + 5 = 5 + 2
• B. 4 - 3 = 3 - 4
• C. 10 $\times$ 2 = 2 $\times$ 10
• D. 10 $÷$ 5 = 5 $÷$ 10

Answer 1

Answer: (A), (C)

The correct options are
A 2 + 5 = 5 + 2
C 10 $\times$ 2 = 2 $\times$ 10

An operation is commutative if changing the order of terms wouldn't change the result.

1) 2 + 5 = 7 and 5 + 2 = 7
$\Rightarrow 2+5=5+2$

2) $4-3=1and3-4\ne 1$
$\Rightarrow 4-3\ne 3-4$

3) $10\times 2=20and2\times 10=20$
$\Rightarrow$ 10 $\times$ 2 = 2 $\times$ 10

4) $10÷5=2and5÷10\ne 2$
$\Rightarrow 10÷5\ne 5÷10$

Therefore, addition and multiplication are commutative but subtraction and division are not.