Bonjour,
24x45
20* 40 + 20*5+4*40+ 4*5 =
800+100+160+20=
1080
28x75
20*70 + 20*5 + 8*70+8*5 =
1400+100+560+40
= 2 100
18x15
10*10+10*5 +8*10+8*5 =
100+50+80+40=
270
25x12
20*10+20*2 +5*10+5*2
=200+40+50+10
=300
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Bonjour,
24x45
20* 40 + 20*5+4*40+ 4*5 =
800+100+160+20=
1080
28x75
20*70 + 20*5 + 8*70+8*5 =
1400+100+560+40
= 2 100
18x15
10*10+10*5 +8*10+8*5 =
100+50+80+40=
270
25x12
20*10+20*2 +5*10+5*2
=200+40+50+10
=300