Idea 5of 24Builds onEqual parts make a fraction
Compare fractions of the same whole
Is half of one thing always the same as half of another?
Today you'll discover
- why the size of the whole matters
- when two halves are equal
- how to compare fairly
Think firstSam and Leila each ate 1/2 of a sub
Sam's sub was long; Leila's was short. Who ate more sub?
Decide first, then press Next. Look at the size of each whole.
Two bars, Sam's long and Leila's half as long, each cut in two with one part shaded. The parts are counted, then dashed lines mark where each shaded half ends. Then two bars of the same length, halves lined up. The last step shows half of a small bar and a fourth of a large one.
See the whole ideathe big idea and the key word, in one place
The big idea
Compare fractions of the same whole: half a big pizza is more than half a small one.
Easy to get wrongA fraction is always a fraction OF something. Before comparing 1/2 and 1/4, check that both are parts of the same whole.
Around you1/4 of a large pizza can be more pizza than 1/2 of a small one.
Key word
- same whole
- wholes that are the same size, so their fractions can be compared fairly
Ready to use it?
- Check that two fractions share the same whole.
- Compare parts of wholes of different sizes.