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Lesson 5: Adding and subtracting mixed numbers

# Subtracting mixed numbers with regrouping

Sal practices subtracting mixed numbers with common (like) denominators. Items require regrouping (borrowing).

## Want to join the conversation?

• How was he able to do all that regrouping.
• regrouping here is a lot like the normal regrouping in subtracting whole numbers. You "borrow" from the next place value over so you can do the subtraction
• why doesn't khan academy have a video about subtracting mixed numbers from whole numbers? if it does, where is it?
• Subtracting mixed numbers from whole numbers is really basic. You first subtract the whole number parts and find the difference. You then reduce the difference by 1, keep that as the whole number part, "copy and paste" the denominator of the mixed number into the denominator of the difference, then subtract the value in the denominator of the mixed number by the value in the numerator (of the mixed number), then put that difference into the answer's numerator.

In other words, subtracting mixed numbers from whole numbers means you are subtracting mixed numbers by mixed numbers, except the fraction part of the mixed number of what is actually a "whole number" equals 0.
• why did people create fractions they are annoying
• Well Lexi, fractions are just a portion of a whole. If we didn't have fractions, we'd have to pay at least a dollar for EVERYTHING. With fractions, we are able to purchase things for a quarter (1/4), a half dollar (1/2), or even forty cents (four dimes, also known as 4/10 or 40/100).

There are lots of good reasons for fractions. Keep practicing and sooner or later you'll find they are fun.
• how do you do that hard math
• Albab is not wrong
• But why did he change the 4 to a 3, is he subtracting?
• yes, he's subtracting
• give a upvote if you don't know me