Ex 2
a) 315:1=315
426:1=426
b) 24:4=8
10000:10=1000
c) 15 rest 6 :3=5 rest 2
45 rest 5 :7=6 rest 5
d) 1:1=1
0:0=0
e) 30:2=15
80:5=16
f)25 rest 2 :12=2 rest 1
440:50=8 rest 8
g) (72+63):9=72:9+63:9
(48-32):8=48:8-32:8
h) (98-23):5=35:5+40:5
(54-42):6=36:6-24:6
Succes!!