Add
5+8
13
9-3
parts are 2 and 9
whole is 11
2+3=4+1?
yes, both equal 5
part, part, whole is called what?
number bond
11+9
20
10-6
parts are 7 and 8
whole is 15
1+5=5+1?
yes, both equal 6
_+_=_
number sentence
11+10
11-7
4
whole is 15, part is 6
part is 9
4+8=6+6?
yes both equal 12
minus sign
subtract
15+8
23
15-8
7
whole is 18, part is 8
part is 10
5+1=7+2?
no
equal to
have the same answer, or are the same number
12+12
24
20-8
12
whole is 20, part is 15
part is 5
2+6=4+5?
no
11+11 is called what?
double