Idea 8of 24Builds onSplit the parts: same amount, new name
Multiply the top and bottom by the same number
How do you make an equivalent fraction without drawing it?
Today you'll discover
- why both numbers change together
- why adding does not work
- how to go back the other way
Think firstRavi splits every fourth into 3 equal parts
What does 3/4 become?
Decide first, then press Next. Watch both numbers change together.
A strip in fourths with three shaded, above a strip in twelfths. The parts are counted, then the two are shown equal. Then a strip in eighths and one in fourths, 6/8 and 3/4, are shown equal. The last step shows strips for 2/5, 4/7 and 4/10.
See the whole ideathe big idea and the key word, in one place
The big idea
Multiply the numerator and denominator by the same number to make an equivalent fraction.
Compare themMultiply: 2/5 with × 2 on top and bottom is 4/10, the same amount. Add: 2 more on top and bottom is 4/7, a bigger amount.
Going backDivide both by the same number: 6/8 is 3/4 (÷ 2), and 9/12 is 3/4 (÷ 3).
Key word
- multiplying top and bottom
- making an equivalent fraction by multiplying the numerator and the denominator by the same number
Ready to use it?
- Make an equivalent fraction by multiplying.
- Spot a wrong equivalent made by adding.