Mathness!Math Worksheets
Open the grade 3 sheets
Finding the area of rectangles by multiplying the side lengths, and of L-shapes by splitting them into rectangles.
Make a sheetDownload PDFThe PDF has this sheet, its answer key and a guide for grown-ups.
The area of a rectangle is length × width. For an L-shape, split it into two rectangles, find each area, then add.
Watch for: Adding the sides (that's perimeter) instead of multiplying. Counting part of an L-shape twice when splitting it. Using a side length that belongs to the other rectangle.
At home: Measure a rug or a table and multiply to find its area.
Luna's Space Adventure
Grade 3 · Area by multiplying · 3.MD.C.7
Astronaut Luna is exploring a far-off corner of space. Solve each problem to help Luna's mission go smoothly!
Multiply the side lengths.
Find each part's area, then add.
Luna's Space Adventure
Grade 3 · Area by multiplying · 3.MD.C.7
Astronaut Luna is exploring a far-off corner of space. Solve each problem to help Luna's mission go smoothly!
Multiply the side lengths.
Find each part's area, then add.
New problems every time, three levels (gentle, core and stretch), themes to pick from, a second page if you want one. Each sheet comes with an answer key and a one-page guide for grown-ups.
Save to PinterestCommon Core 3.MD.C.7 · Connect area to multiplying and adding.
Also: Maryland 2025 3.GR.C.7 · Texas TEKS 3.6C · Florida B.E.S.T. MA.3.GR.2.2 · Virginia SOL 4.MG.3