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.

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