Students will learn that multiplying a number by a fraction less than 1 scales it down, multiplying a number by a fraction greater than 1 scales it up, and multiplying a number by a fraction greater than 1 has no effect. Here's an example problem: Order the fractions from least to greatest:

$$\dfrac{2}{3} \cdot \dfrac{7}{8}\quad\quad\dfrac{8}{7} \cdot \dfrac{2}{3}\quad\quad\dfrac{5 \cdot 2}{3 \cdot 5}$$Watch these Khan Academy videos:

Fraction multiplication as scaling by Khan Academy

Next, give your students these challenges:

- 2018 Math Kangaroo Levels 5-6 Problem #25 by STEM4all
- Next Domino by NRICH

Conclude by leading this investigation:

Integral Centrifuge II (multiplication of negatives)

by MathPickle

5.NF.B.5: Interpret multiplication as scaling (resizing).