Solve equations using the rules of order of operations. Progress from simple adding and subtracting to all four operations with grouping symbols. Interpret verbal expressions and write the corresponding arithmetic expression using numbers and symbols. And, interpret numeric expressions and write the corresponding verbal expression.
Provide enrichment by introducing order of operations with addition and subtraction. Correct the common misconception that adding always comes before subtracting. Read equations left to right and do the operation that comes first. What's 8-2+4? Subtract first, then add. Since 8-2 = 6 and 6+4 = 10, 8-2+4 = 10.
Provide enrichment by using parentheses - a grouping symbol - to group numbers and operations explicitly. Simplify expressions inside any parentheses first. What's 9-(5-2)? First subtract 5-2 = 3. Then subtract 9-3 = 6. What's (9-2) - (3+1)? First subtract 9-2 = 7. Then add 3+1 = 4. Finally, subtract 7-4 = 3. Prerequisites: 2-23
Introduce the correct order of operations without grouping symbols. When equations have only addition and subtraction, or only multiplication and division, do operations from left to right. When 3 or 4 different operations, multiply and divide first, then add and subtract. What's 3 + 4 x 5? 4x5 = 20, and 3+20 = 23. Prerequisites: 2-24
