Mr huynh wrote the sum 7 fifteens and 38 fifteens on the borad draw a modle and wrte the corrtect expression

We are given statement: The sum 7 fifteens and 38 fifteens.

Solution: It is said 7 fifteens.

So, 15 is written 7 times, that is

15 + 15 + 15 + 15 + 15 + 15 + 15.

15 + 15 + 15 + 15 + 15 + 15 + 15 can be written as 7 times 15 or 7 * 15.

Then, 38 fifteens.

So, 15 is written 38 this time.

So, 38 fifteens could be written as 38 * 15.

Now, the sum 7 fifteens and 38 fifteens can be written finally as:

7 * 15 + 38 * 15 This is our final expression.