Many children never master fractions. When asked whether 12/13 + 7/8 was closest to 1, 2, 19, or 21, only 24% of a nationally representative sample of more than 20,000 US 8th graders answered ...

Size of an interval on a number line Example: fractions on a number line Each of these shapes have been split into two equal parts. Each part is a half. Half is shaded orange and half is unshaded.

Size of an interval on a number line Example: fractions on a number line Each of these shapes have been split into two equal parts. Each part is a half. Half is shaded orange and half is unshaded.