Place Value Partitioning

WALT: solve multiplication problems using place value partitioning

There are 8 pencils in a box. AJ has 15 boxes of pencils.
How many pencils are there 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 the answer. Then
I added 80 and 40 and I got 120. So AJ has 120 pencils
altogether.

By Jason