Korrutus/tabel
2*2
4
2*20
40
12 =
12= 10+2
18=
18= 20-2
3*13 =
3*13 =
3*10 + 3*3 =
30 + 9 = 39
3*4
12
3*30
90
15 =
15= 10+5
27=
27= 30-3
5*11=
5*11=
5*10 + 5* 1 =
50 + 5 = 55
4*8
32
4*30
120
23 =
23= 20+3
39 =
39= 40-1
2*19=
2*19=
2*20 - 2*1=
40-2= 38
5*7
35
6*30
180
34 =
34=30+4
46=
46 = 50-4
32*3=
32*3=
30*3 + 2*3 =
90+6 = 96
6*9
54
7*40
280
45=
45= 40+5
57=
57 = 60-3
48*2=
48*2=
50*2 - 2*2 =
100-4 = 96