9235076993250679 2000000999999
4800÷244800÷30 2560000266万
98×21≈10000 349×2≈7000
05×29≈15000 39×53≈2000
0÷32= 540÷6= 18×50= 420÷70=
39×41≈ 695×71≈ 6294÷71≈ 479÷81≈
112+98 231-72-28 765-107 342-96