Addition
1+10=
11
50-10=
40
1+16=
17
15+20=30
false
4
2+15=
17
45-3=
42
60-15=
45
1+5=6
true
how many sides does a triangle have?
3
50+41=
91
25-15=
10
80+14=
94
50-8=58
false
how many sides does a pentagon have?
5
100+205=
305
85-15=
70
72+6=
78
85-2=100
false
how many sides does a hexagon have?
6
502+411=
913
250-110=
140
65-12=
53
500+500=1000
true
how many sides does an octagon have?
8