Partition circles and rectangles into two and four equal shares, describe the shares using the words "halves", "fourths", and "quarters", and use the phrases "half of", "fourth of", and "quarter of". Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.

Partition a rectangle into rows and columns of same-size squares and count to find the total number of them.

Understand a fraction 1/b as the quantity formed by 1 part when a whole is partitioned into b equal parts; understand a fraction a/b as the quantity formed by a parts of size 1/b.