Third grade math: cut a square paper with a side length of 8 cm into four rectangular papers of the same size. What is the circumference of each rectangular piece of paper?
Cut a square paper with a side length of 8 cm into four rectangular papers of the same size, each of which is 8 cm long. The width is 2 cm (8 cm ÷4), so the circumference of each rectangular paper is:
(8 cm +2 cm) ×2
=10cm× 2
= 20 cm.
(8 cm +8 cm ÷4)×2
= (8cm+2cm) ×2
=10cm× 2
= 20 cm.