1.
?
2.
1
2
3
3.
1
2?
?
?
1
3+2 = 6-3 = 5+1 = 5+3= 7-4= 8-2=
2+7 = 9-4 = 7-2 = 8-5= 2+5= 5+4=
(3+23253+2=5)
2.
80
50
70
6
10203040
1. 1
1020
2
4
10+20
2.
10+20
1
2
3
1310+2030
2101102021031030
3201013330
41+2310+2030
3.
12330
10 + 20 = 30
1 2 3
20+1020101330
1.
3010
2.
3.
30-10
4.
30-10
30-10
120
230310131220
330310220
43-1=230-10=20
510+20=3030-10=20
4.
30-1031220
30 - 10 = 20
3 1 2
1.
30+50= 70-50= 40+20=
60+40= 30+30= 80-40=
90-50= 70+10= 10+50=
100
2
3
10 + 20 = 30 30 – 10 = 20
1 2 3 3 1 2