Solve 15 x 12 using the method from the video. Show each step, breaking the numbers into tens and ones and multiplying each part separately.

10 x 10 = 100, 10 x 2 = 20, 5 x 10 = 50, 5 x 2 = 10. Then, 100 + 20 + 50 + 10 = 180

Which expression represents how to solve 45 x 23 by breaking down each number by its place value?

(40 x 20) + (40 x 3) + (5 x 20) + (5 x 3)

Grade 2nd Grade · Math · 30 min

I can solve multiplication problems with 2-digit numbers using arrays.

Khan Academy · 4:26

Multiplying two 2-digit numbers using partial products

3 key concepts

1
When multiplying 37 × 26, we can break it down into (30 × 6) + (7 × 6) + (30 × 20) + (7 × 20), which equals 180 + 42 + 600 + 140.
2
Multiplying 37 × 26 can be thought of as finding the sum of 37 sixes and 37 twenties.
3
When multiplying two 2-digit numbers using partial products, it's helpful to stack the numbers by their place value to keep track of the ones, tens, and hundreds.

3 questions · Multiple choice & Short answer

Quick comprehension check

“Solve 14 x 12 using the array method. Break down each number by tens and ones, and show all the smaller multiplication problems you need to solve.”

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