90÷3=30, 12×4=48, 68÷2=34, 200+3000=3200,
80-46=34, 77÷7=11, 50×3=150, 5600-600=5000,
54+36=90, 42+35=77,
1
4 +
2
4 =
3
4 , 4000+3000=7000,
37+25=72, 69÷3=23,
3
10 +
6
10 =
9
10 , 10000-4000=6000.
90÷3=30, 12×4=48, 68÷2=34, 200+3000=3200,
80-46=34, 77÷7=11, 50×3=150, 5600-600=5000,
54+36=90, 42+35=77,
1
4 +
2
4 =
3
4 , 4000+3000=7000,
37+25=72, 69÷3=23,
3
10 +
6
10 =
9
10 , 10000-4000=6000.