Students will learn how to recognize halves, quarters, and thirds. This builds on the 1st grade understanding of halves and quarters. Students can practice this skill here and here. Conclude this lesson by giving your students this challenge, and also this one. Order doesn't matter, they're equally difficult.

Do these Khan Academy exercises:

Next, give your students this challenge:

Can you find the trick? by Mathy Mahdi

Conclude by leading this investigation:

Lazy Toad Puzzles (counting, symmetry)

by MathPickle

2.G.A.3: Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not have the same shape.