Two-Digit Multiplication
Learning Objective
I can multiply a two-digit number by a two-digit number.
Key Concepts
When multiplying a two-digit number by another two-digit number, you can start by multiplying the top number by the ones digit of the bottom number, just like multiplying by a one-digit number.
When multiplying by the tens digit, remember that this digit represents a multiple of ten, so you need to add a zero as a placeholder in the ones place of the second partial product.
After finding both partial products, add them together to get the final product.
Practice Questions
This lesson includes 3 practice questions to reinforce learning.
View questions preview
1. Solve 25 x 12 using the method described in the video. Show your work.
2. Why do we add a zero as a placeholder when multiplying the second digit in a two-digit by two-digit multiplication problem?
3. Which expression shows how to break down the multiplication problem 42 x 15, using the distributive property as shown in the video?
Educational Video
2-digit times a 2-digit number | Multiplication and division | Arithmetic | Khan Academy
Khan Academy