CCSS.Math.Content.2.G.A.2

Math2nd GradeReason with shapes and their attributes.

The standard

Partition a rectangle into rows and columns of same-size squares and count to find the total number of them.

Common Core State Standards for Mathematics · Geometry

What this standard means

Students need to split a rectangle into equal-size squares arranged in clear rows and columns. They should count the squares to find the total, using skip counting or repeated addition when ready.

Mastery looks like drawing or using a rectangle grid, naming the number of rows and columns, and finding the total without missing or double-counting squares. Students often get stuck when rows are uneven, squares are not the same size, or they count around the edge instead of counting every square inside.

Ways to teach it

Give students square tiles and have them cover a 3 by 4 rectangle outline, then count the total tiles used.
Ask students to explain, in writing, how they know a 2-row, 5-column rectangle has 10 squares.
Show three rectangle grids, two correct and one with uneven squares, and have students circle the valid partition.
Connect to a muffin tray by counting rows and columns to find how many muffins it can hold.

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