The Commutative property: Only addition and subtraction

Since the exercise only involves addition, we will use the commutative property to solve it more conveniently:

$8+2+9=$

Now let's solve the exercise from left to right:

$8+2=10$

$10+9=19$

Since the exercise only involves addition, we will use the commutative property to calculate more conveniently:

$5+5+14=$

We will then solve the exercise from left to right:

$5+5=10$

$10+14=24$

Since the exercise involves only addition, we will use the commutative property to calculate more conveniently:

$13+7+101=$

Solve the exercise from left to right:

$13+7=20$

$20+101=121$