10640÷560=
504900÷4900=
213×105=
49×215=
10640÷560=10640÷(80×7)=10640÷80÷7=19, 504900÷4900=103…200 1 0 3 4900 √5~0~4~9~0~0 4 9 0 0 _________ 1 4 9 0 0 1 4 7 0 0 _________ 2 0 0213×105=22365 2 1 3×1 0 5_________ 1 0 6 5 2 1 3__________ 2 2 3 6 549×215=10535 4 9×2 1 5_________ 2 4 5 4 9 9 8_________ 1 0 5 3 5