Section outline

    • $$3 + 7 =$$ $$6 + 2 =$$ $$9 + 4 =$$ $$2 + 8 =$$ $$5 + 3 =$$ $$1 + 9 =$$ $$4 + 6 =$$ $$7 + 1 =$$ $$8 + 5 =$$ $$2 + 4 =$$