Use parentheses, brackets, or braces in numerical expressions, and evaluate expressions with these symbols. Use Focus to pick the grouping level, or Mix All.
Write a numerical expression that records a calculation in words ("add 8 and 7, then multiply by 2" is 2 × (8 + 7)), and interpret an expression without evaluating it.
Reason about order of operations by building and comparing expressions: insert operations and parentheses to make an equation true, and compare two groupings of the same numbers, and explain number tricks with algebra.
Two quantities that change together, in words, a table, a graph and an equation: each problem carries one situation through them — name the variables, plot and read graphs, write the equation and use it forwards and backwards.
Work with linear expressions three ways: expand a bracket, take out the greatest common factor, and collect like terms — including when a whole bracket is subtracted.
Rewrite an expression in an equivalent form and say what the new form reveals — that taking 20% off means multiplying by 0.80, or that two successive discounts do not simply add.
Multi-Step Problems with Rational NumbersG77.EE.B.3
Solve multi-step problems using positive and negative numbers in any form — whole numbers, fractions, decimals and percents — then check that the answer is reasonable.
Solve multi-step linear equations in one variable — with variables on both sides, distributing where needed, and recognizing equations with one, no, or infinitely many solutions.
Solve systems of two linear equations by graphing (the solution is the point where the lines cross), by substitution, and by elimination, including real-world problems.