Rows & Columns in Rectangles
Partition a rectangle into rows and columns of same-size squares and count to find the total number of them
What a learner can do afterwards
- Divide a rectangle into equal rows and columns of unit squares
- Count the total number of squares using repeated addition or skip counting
- Relate the rows-and-columns structure to a rectangular array
The lesson
You already know how to make arrays for multiplication. A rectangle can be split into a grid the same way. Draw lines across and down to make equal rows and columns of same-size squares.
Mia draws a rectangle and adds lines to split it into 2 rows and 5 columns of equal squares. She skip counts by rows: 5, 10. The rectangle holds 10 squares.
Count how many squares are in one row, then skip count that number once for each row. It is much faster than counting every square by one.
Split a rectangle into equal rows and columns, then skip count or add row by row to find the total number of squares.
Watch it
Where it sits
Learn first
This opens up
Nothing builds on it yet.
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.