Rectangle perimeter

Perimeter and area · Measurement

Perimeter and area of rectangles, then area of parallelograms and triangles.

This is step 1 of unit 5, “Perimeter and area”, in Stage 6: Factors, common denominators, multiplying fractions and decimals, area (ages 12). A round has 10 problems; 90% or better earns three stars. Everything is free with no sign-up, and your stars and XP are saved on this device.