Question

Write two expressions to show a number increased by 11. Then, draw models to prove that both expressions represent the same thing.

Answer 1

n + 11 and 11 + n

Explanation:

Let n be the unknown number,

n is increased by 11,

That is, n + 11

By the commutative property of addition,

The expression would be,

11 + n

For drawing a model that shows n + 11

Take two boxes in which first shows n and second shows 11 and add them,

Similarly, for showing 11 + n, take first box that shows 11 and second box that shows n then add them.