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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?

• 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.
• But why did he change the 4 to a 3, is he subtracting?
• yes, he's subtracting
(1 vote)
• Another way to solve this problem is to simply convert our two mixed numbers into improper fractions, than we have a simpler subtraction (17/4-10/4)and then just convert what remains after this subtraction (7\4) back to a mixed number as our final result
( 1"whole" and 3\4 = 1 3\4).
• I have watched the vid but I am still quiry/confused.
• can fractions be considered as even or odd?
(1 vote)
• No. Only integers can be even or odd.
• i am confused. if i covert 1/4 to the one fourth will it still work?
(1 vote)
• is the mixed numbers part of the Question?
(1 vote)
• I am still very confused on the whole concept
(1 vote)
• i really need to get go at this because i am all most going to 5th grade!