# Operations & Algebraic Thinking

## Common Core Standard #1

Use parentheses, brackets, or braces in numerical expressions, and evaluate expressions with these symbols.

## Common Core Standard #2

Write simple expressions that record calculations with numbers, and interpret numerical expressions without evaluating them. For example, express the calculation "add 8 and 7, then multiply by 2" as 2 × (8 + 7). Recognize that 3 × (18932 + 921) is three times as large as 18932 + 921, without having to calculate the indicated sum or product.

## Common Core Standard #3

Generate two numerical patterns using two given rules. Identify apparent relationships between corresponding terms. Form ordered pairs consisting of corresponding terms from the two patterns, and graph the ordered pairs on a coordinate plane. For example, given the rule "Add 3" and the starting number 0, and given the rule "Add 6" and the starting number 0, generate terms in the resulting sequences, and observe that the terms in one sequence are twice the corresponding terms in the other sequence. Explain informally why this is so.

## Me and Cai Doing Standard #1

So like the standard said to we used brackets and parentheses and an example of this is inserting parentheses into equations like we did and have no proof of.

## Me and Cai Doing Standard #2

Also like the one before we did what the standard said, we did the in and out box things and looked at the rule and took the in and made it the out.

## Me Cai Doing Standard #3

The 3rd standard is basically the 2nd standard but harder and longer, it says to find the patterns like 2 _ 4, 3 would go in the blank.