When two fractions have the same denominator, the parts are the same size. So the fraction with more parts is bigger. 5/8 is bigger than 3/8 because 5 eighths is more than 3 eighths.
You only need to compare the numerators. But both fractions must be parts of the same-sized whole, like two equal pizzas. We use > and < just as with whole numbers: 5/8 > 3/8.
Worked example
Which is greater: 4/10 or 7/10?
- The denominators are both 10, so the parts are the same size.
- 7 parts is more than 4 parts.
Answer:7/10
Key words
- compare
- decide which is bigger
- same denominator
- parts of the same size
- greater than (>)
- bigger than
Practise this
New questions every time.
Common Core-referenced: 3.NF.A.3d