Expressions & Variables 1-2
(we are skipping
1.1 for now—will pick it up with a unit
on data and stats)
LOTS of VOCAB
term: a number and
or variable added or subtracted to another number and or variable
factors : a number
and or variable multiplied by another number and or variable
addition words:
sum, total plus, more than greater than addends
altogether both
subtraction words:
difference minus, less than, less
minuend subtrahend
multiplication
words: product, times, factors, each
division words:
quotient, dividend divisor , shared equally
expression: at
least one term ( with NO equal sign)
equation: equal
expressions ( it must have an = sign)
numerical: all
numbers ( called constants)
variable: a letter
( or symbol) used to represent a number
algebraic (or
variable): has at least one variable
simplify a
numerical expression: do order of operations you will get a simpler expression
evaluate- given
the value of the variable you “plug and chug” in an algebraic expression and
simplify using operations
You should be able
to write a numerical expression in words:
3 + 7 is The sum of three and seven
You should be able to
write a numerical equation in words:
3 + 7 = 10
The sum of three
and seven is ten
Evaluating VARIABLE ( or
algebraic) expressions
Evaluate 5x + y
when x = 1.2 and y = 0.8
5(1.2) + 0.8 = 6.8
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