There are 8 pencils in a box. AJ has 15 boxes of pencils. How many pencils are altogether?

15 x 8 =

10 x 8 = 80

5 x 8 = 40

80 + 40 = 120

To solve this problem, I used place value partitioning. I multiplied 10 by 8 and I got 80 as the answer.
Then, I multiplied 5 by 8 and I got 40 as their answer. Then I added 80 and 40 and I got 120.
So AJ has 120 pencils altogether.