Just a start! Lego is a great material for modelling fractions. Just as good as cuisenaire rods. And…I have lots of it (and hopefully you do too)!
LEGO Fraction Exploration: A great warm up before you dive into exploring equivalency. It is helpful to know how to identify fractional (a.k.a. proportional) relationships. If your child struggles with the drawing part, try using graph paper. If you don’t have any, try using some free printable paper.
Exploring Equivalency 1: This is a nice, simple start exploring fractions that are equivalent to 1/2. I would get out the math journals for the drawing and describing bit. A nice follow up would be to have students build two structures out of lego (or even build in Minecraft) to show 1/2 in different (but equivalent ways).
Exploring Equivalency 2: Exploring fractions that are equivalent to 1/4 and 3/4
Exploring Equivalency 3: Exploring fractions that are equivalent to 1/3 and 2/3
Exploring Equivalency 4: Exploring fractions that are equivalent to 1/5 and 3/5