1st Grade Math Vocab - Add and Sub Stragegies
symbol
A letter or figure that stands for something else. Example: This symbol (+) means to add.
plus (+)
A symbol to show addition. Example: 4 + 5 = 9
doubles plus one
Add the doubles, then add one more
fact family
Addition and subtraction sentences that use the same numbers. Sometimes called related facts.
addition sentence
An expression using numbers and the + and = sign.
subtraction sentence
An expression using numbers and the - and = sign
number sentence
An expression using numbers and the = sign, or the < or > sign.
addend
Any numbers or quantities being added together.
equals (=)
Having the same value as or is the same as. Example: 2 + 4 = 6
count up or count on
On a number line, start at the number 4 and count up 2.
count back
On a number line, start at the number 5 and count back 3.
part
One of the parts that are joined when adding.
difference
The answer to a subtraction problem.
sum
The answer to an addition problem
zero 0
The number zero equals none or nothing.
minus (-)
The sign used to show subtraction.
round
To change the value of a number to one that is easier to work with. Example: 24 rounded to the nearest ten is 20.
estimate
To find a number close to an exact amount.
add (adding, addition)
To join together sets to find the total or sum.
subtraction (subtract)
To take away, take apart, separate, or find the difference between two sets. The opposite of addition
doubles
Two addends that are the same number.
related fact(s)
Basic facts using the same numbers. Sometimes called a fact family.
