^

Multiply and divide in parts - mental math, area model, 2-digit by 2-digit

Learn how to use partial products to multiply numbers such as 7 × 84 or 4 × 321 with mental math. We also use subtraction — such as with 6 × 99!



In the second part of the lesson, we focus on the area of a two-part rectangle, which gives us a simple visual model to illustrate partial products (the distributive property), here called "multiplying in parts".


In the third part, I show how to solve a 2-digit by 2-digit multiplication problem with the partial products algorithm.


Lastly, did you know we can also divide in parts?



See also

The distributive property — introduction (video lesson)

Expressions – What are expressions and how to evaluate them

Math Mammoth Grade 6 curriculum

Back to 6th grade videos index

Back to the index of all videos

WAIT!

Receive my monthly collection of math tips & resources directly in your inbox — and get a FREE Math Mammoth book! :)


We respect your email privacy.
You can unsubscribe at any time.