Praxis Elementary Education Math (5003) Practice Test 2026 – Complete Exam Prep

To calculate the perimeter of a rectangle, you use the formula:

Perimeter = 2 × (length + width)

In this case, you have a rectangle with a length of 10 cm and a width of 5 cm. Plugging these values into the formula gives:

Perimeter = 2 × (10 cm + 5 cm)

Perimeter = 2 × 15 cm

Perimeter = 30 cm

Thus, the correct perimeter of the rectangle is 30 cm. This means that the correct choice reflects the sum of both dimensions doubled, confirming the appropriate method to find the perimeter.