Students will learn that a/b = (na)/(nb) for any choice of n. Then students will learn how to use this idea to solve equations using equivalent fractions. For example, what is \(x\) if \(x/3 = 4/3?\) what is \(x\) if \(4/12 = 1/x.\)

Watch these Khan Academy videos:

Do these Khan Academy exercises:

Next, give your students this challenge:

Scaling Clowns by NRICH

Conclude by leading this investigation:

Ninja Bed Bugs (multiplication)

by MathPickle

4.NF.A.1: Explain why a fraction *a*/*b* is equivalent to a fraction (*n* × *a*)/(*n* × *b*) by using visual fraction models, with attention to how the number and size of the parts differ even though the two fractions themselves are the same size. Use this principle to recognize and generate equivalent fractions.