6999万○70000000?????????????508×98○510×96(不计算,巧比较)
4个直角○一个周角????????????39?7666○39?7676.
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解:(1)6999万=69990000,
69990000<70000000;
(2)508×98=508×96+508×2,
510×96=508×96+96×2,
508×96+508×2>508×96+96×2,
所以508×98>510×96;
(3)4个直角=1个周角,
4个直角=一个周角;
(4)39?7666<39?7676.
故