For activities with important visual aids. Unit: 4.3 Extending Operations to Fractions (Grade 4). 4.3 Extending Operations to Fractions Unit Goals Students learn that a fraction $\frac{a}{b}$ is a product of a whole number $a$ and a unit fraction $\frac{1}{b}$, or $\frac{a}{b} = a \times \frac{1}{b}$, and that $n \times \frac{a}{b} = \frac{(n \space \times \space a)}{b}$. Students learn to add and subtract fractions with like denominators, and to add and subtract tenths and hundredths. Section A Goals Recognize that $n \times \frac{a}{b} = \frac{(n \space \times \space a)}{b}$. Represent and explain that a fraction $\frac{a}{b}$ is a multiple of $\frac{1}{b}$, namely $a \times \frac{1}{b}$