Question

Ming drew the model below to represent the equation 24 + 12 = blank x (8 + 4). A model with 3 rows of 8 and 3 rows of 4. What is the missing value in Ming's equation?

Answer 1

Given:

The equation is:

$24+12=\_\_\times (8+4)$

A model with 3 rows of 8 and 3 rows of 4.

To find:

The missing value in Ming's equation.

Solution:

We have,

$24+12=\_\_\times (8+4)$           ...(i)

A model with 3 rows of 8 and 3 rows of 4. Using this information, we get

$24+12=3\times 8+3\times 4$

Taking out the common factor 3, we get

$24+12=3\times (8+4)$               ...(ii)

On comparing (i) and (ii), we get the missing value is 3.

Therefore, the missing value in Ming's equation is 3.