reminder 22 A letter representing an unknown quantity is called a variable. What is 16 ÷ 2? 8 150 150 31 31 17 22 10 7 20 comment Again with the super slow counting... What is 5 × 2 + 16? 42 26 90 26 275 150 27 0 17 22 10 7 5 35 comment Too bad we couldn't use those tickets for the fair!