Răspuns :
1. Numerele de doua ori mai mici ca un numar se calculeaza impartind numarul la 2.
10:2=5
14:2=7 s.a.m.d
2.18:2=9
12:2=6
16:2=8
20:2=10
9+6+8+10=
10:2=5
14:2=7 s.a.m.d
2.18:2=9
12:2=6
16:2=8
20:2=10
9+6+8+10=
1)
10:2=5
14:2=7
8:2=4
18:2=9
2:2=1
2)
18:2=9 catul
18+2=20 suma
12:2=6catul
12+2 suma
16:2=8 catul
16+2=18 suma
20:2=10 catul
20+2=22 suma
10:2=5
14:2=7
8:2=4
18:2=9
2:2=1
2)
18:2=9 catul
18+2=20 suma
12:2=6catul
12+2 suma
16:2=8 catul
16+2=18 suma
20:2=10 catul
20+2=22 suma