Order of Operations
Challenge: Missing Parentheses
Add parentheses and grouping symbols to each order of operations
problem to make the equation true.

1) 4 x 3 + 7 - 6 x | + 4 = 20
2) 60 - 18 ÷ 2 + 4 + 10 ÷ 2 = 12
3) 80 - 36 ÷ 2 + 6 - 2 x 5 + 1 = 44
4) 3 x 5 + 4 - 2 x 2 + 6 - 4 = 15