6.EE.A.2: Expressions with variables

Also written as 6.EE.2

Write, read, and evaluate expressions in which letters stand for numbers.

In plain words: Students write expressions where letters stand for numbers, name the parts of an expression, and evaluate it for given values.

Quick picks

Example problem: Write an expression for:
$5(x + y + z)$
Assign problem on Goblins →
Common mistake: Working left to right instead of multiplying first: for x = 2, getting 8 + 3x = 22 instead of 8 + 6 = 14.
Builds on: 5.OA.A.1Grouping symbols in expressions 5.OA.A.2Writing simple expressions
Leads to: 6.EE.A.3Equivalent expressions 6.EE.A.4Identifying equivalent expressions 6.EE.B.6Variables in word problems

6.EE.A.2.aWrite expressionsWrite expressions that record operations with numbers and with letters standing for numbers.6.EE.A.2.bName the partsIdentify parts of an expression using mathematical terms (sum, term, product, factor, quotient, coefficient); view one or more parts of an expression as a single entity.6.EE.A.2.cEvaluate expressionsEvaluate expressions at specific values of their variables. Include expressions that arise from formulas used in real-world problems. Perform arithmetic operations, including those involving whole-number exponents, in the conventional order when there are no parentheses to specify a particular order (Order of Operations).

Khan Academy Resources

Write expressions 6.EE.A.2.a

Writing basic expressions with variables Writing expressions with variables Writing basic expressions word problems Writing expressions with variables Writing basic expressions with variables Writing basic expressions word problems Why aren't we using the multiplication sign?Writing basic expressions word problems Writing basic expressions with variables Writing expressions with variables & parentheses Writing expressions with parentheses Writing algebraic subtraction expressions Writing expressions with variables

Name the parts 6.EE.A.2.b

Terms, factors, and coefficients review Parts of algebraic expressions Variables, expressions, & equations Terms, factors, & coefficients

Evaluate expressions 6.EE.A.2.c

Evaluating expressions with one variable Evaluating expressions with two variables: fractions & decimals Evaluating expressions with variables word problems Order of operations review Evaluating expressions with two variables Expression value intuition Evaluating expressions with multiple variables Evaluating expressions with one variable Expression value intuition Order of operations with fractions and exponents Evaluating expressions with variables word problems Evaluating expressions with multiple variables: fractions & decimals Variable expressions with exponents Order of operations Evaluating an expression with one variable Order of operations example Evaluating expressions with variables: temperature Evaluating expressions with variables: exponents Intro to order of operations Worked example: Order of operations (PEMDAS)Order of operations example Evaluating expressions with variables: cubes Order of operations introduction Order of operations example: fractions and exponents Evaluating exponent expressions with variables Evaluating expressions like 5x² & ⅓(6)ˣ Evaluating expressions with two variables: fractions & decimals Evaluating expressions with two variables Order of operations examples: exponents Expression value intuition

Expressions with variables 6.EE.A.2

What is a variable?

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