VOCABULARY
Chapter 10
Addition and Subtraction Strategies
VOCABULARY
DEFINITION
EXAMPLE
add (addition)
to join together sets to find the total or sum
2+3=5
doubles
two addends that are the same number
8 + 8 = 16
doubles plus 1
two addends in which one number is one
larger than the other
5 + 6 = 11
equals (=)
having the same value as or is the same as
4 + 6 = 10
= is the equal sign
estimate
to find a number close to an exact amount
Estimate:
♥♥♥♥♥♥♥♥♥
Answer: About 10 hearts
fact family
addition and subtraction sentences that use
the same numbers; sometimes called
related facts
4+5=9
9–5=4
5+4=9
9–4=5
pattern
an order that a set of objects or numbers
follows over and over.
ABCABCABCABC...
subtraction
sentence
an expression using numbers and the
– and = sign.
10 – 4 = 6
sum
the answer to an addition problem
7+1=8
8 is the sum