If the required seam allowance is 4 cm, how many times should the folded seam allowance be checked with a ruler?

• A. Four times
• B. Twice
• C. Once
• D. Three times

Answer: (A)

The idea being tested is ensuring a precise and consistent seam width around a fabric piece. If the required seam allowance is 4 cm, you want that width to be uniform along the entire edge before sewing. A rectangular or square piece has four edges, so you should verify the folded seam allowance at each edge. Checking four times—one on each side—helps catch any slight drift or misalignment that could occur as you fold, press, or pin. If you only check fewer edges, you might miss a spot where the width isn’t exactly 4 cm, which could cause the seams to line up poorly later.