Sometimes when subtracting fraction you first have to turn them into improper factions, you can also borrow from the fractions.
A good time to switch to improper factions first is when you find out you can't subtract the numerators and the fractions are small. ,
2 1/2 - 1 3/4 =
2 2/4 - 1 3/4 =
= ?
You can't subtract 3 from 2 so you have to start the question with improper factions,
2 1/2 - 1 3/4 =
5/2 - 7/4 =
10/4 - 7/4
=3/4
These questions are an example of when you need to do switch to start with improper fractions.
A good time to borrow when subtracting fractions is when the fraction are huge,
625 1/2 - 100 3/4 =
625 2/4 - 100 3/4 =
= ?
When the question ends up with 2 subtracted by 3 is a good time to borrow,
625 1/2 - 100 3/4 =
625 2/4 - 100 3/4 =
(624 + 4/4 + 2/4)
624 6/4 - 100 3/4=
= 624 9/4
The question is now solved by borrowing fractions.
You can do any subtracting question now, you can do it normally, you can borrow, or you can use improper fractions
Subscribe to:
Post Comments (Atom)
0 comments:
Post a Comment