Addition
13+2
15
1-0
1
4,7,10,13,____,19,22
16
3 sides, 3 corners
Triangle
143x0
0
15+5
20
21-11
10
13,17,21,_____29,33
25
4 corners, 4 sides with equal lengths
Square
234x1
234
21+19
40
39-22
17
8,16,24,______,40,48
32
4 corners, 4 sides, 2 equal sides, top and bottom equal
rectangle
25x 2
50
17+19
36
107-91
16
24,36,48,_______,72
60
8 corners and 8 equal sides
octogon
33x3
99
14+17+109
140
1020-2010
-990
-1,5,11,____,23,29
17
3d object with 20 sides
Dodecahedron
6x7
42