Idea 12of 24Builds onFrom improper fraction to mixed number
From mixed number back to improper fraction
How many thirds are in 2 1/3?
Today you'll discover
- how many thirds fill each whole
- how to add the extra third
- a quick way to rename
Think first2 1/3 cups of flour, with a 1/3-cup scoop
How many 1/3-cup scoops make 2 1/3 cups?
Decide first, then press Next. Count the thirds in every whole cup.
Three cup-strips side by side, cut into thirds, seven thirds shaded. Brackets mark the two full cups; the thirds are counted; then 7/3 = 2 1/3 is written. The last step shows a ribbon of one metre and five eighths, in eighths.
See the whole ideathe big idea and the key word, in one place
The big idea
To rename a mixed number, count every part: the parts in the wholes plus the extra ones.
In the kitchenA recipe needs 1 3/4 cups and you only have a 1/4-cup measure: 4 + 3 = 7 scoops.
Easy to get wrong2 1/3 is not 5/3. The 2 is two whole cups, and each whole holds 3 thirds.
Key word
- rename
- write the same amount another way, like 2 1/3 as 7/3
Ready to use it?
- Write a mixed number as an improper fraction.
- Count the parts in a mixed number.