Area: Covering Rectangles with Unit Squares

Hey, I'm Lumi! Today we're going to figure out how much space a flat rectangle takes up — and that space has a name: **area**. Imagine you want to tile the floor of your treehouse with tiny square tiles. Each tile is exactly 1 unit wide and 1 unit tall. We call it a **unit square**. To find the area of the floor, you count how many unit squares it takes to cover it completely, with no gaps and no overlaps. Let's try it with a rectangle that is 4 units long and 3 units wide. Lay the tiles in straight **rows** — a row is one horizontal line of tiles going across the rectangle. The first row holds 4 tiles. The second row holds 4 more. The third row holds 4 more. Three rows of 4 tiles each gives you 12 unit squares total. That means the area is **12 square units**. Here's the cool shortcut: instead of counting every single square, you can **multiply** length × width. 4 × 3 = 12. Same answer! This works for any rectangle. Once you know how to calculate area, you can use that same formula to compare two rectangles. Rectangle A is 2 units long and 5 units wide — area = 2 × 5 = **10 square units**. Rectangle B is 4 units long and 3 units wide — area = 4 × 3 = **12 square units**. Rectangle B covers more space because 12 > 10. Remember: area is always written in **square units** — like square centimeters or square inches — because you are counting squares, not just lines. Hint: if you are not sure of the answer, draw the grid and count the rows one at a time. Counting row by row is the same as multiplying — either way gets you the area!