Question

Joe drew this bar model to find the unknown number of balls. find the unknown number? 106 ? = 250

Answer 1

250-106= 144 There are 144 unknown balls.

Answer 2

144

Explanation:

We are given that

106 balls+_=250 balls

We have to find the unknown number of balls in model.

Let x be the unknown number of balls.

To find the unknown number of balls we will use subtraction property of equality.

Substitute the value

`106+x=250`

This is the algebraic expression for this model

Using subtraction property of equality

Then, we get

`x=250-106`

After simplification, we get

`x=144`

Hence, the unknown number=144