325780=________萬 2998500=________萬
354990=________萬 454094900=________億
432157900=________億 86700000=________萬
1960000000=________億 55000000=________萬.
32.578 299.85 35.499 4.540949 4.321579 8670 19.6 5500
分析:這八個小題都是整數(shù)的改寫,其中三個小題是改寫成用“億”作單位的數(shù),五個小題是改寫成用“萬”作單位的數(shù).改寫成用“萬”作單位的數(shù),就是在萬位數(shù)的右下角點(diǎn)上小數(shù)點(diǎn),然后把小數(shù)末尾的0去掉,再在數(shù)的后面寫上“萬”字;改寫成用“億”作單位的數(shù),就是在億位數(shù)的右下角點(diǎn)上小數(shù)點(diǎn),然后把小數(shù)末尾的0去掉,在數(shù)的后面帶上“億”字.
解答:(1)325780=32.578萬;
(2)2998500=299.85萬;
(3)354990=35.499萬;
(4)454094900=4.540949億;
(5)432157900=4.321579億;
(6)86700000=8670萬;
(7)1960000000=19.6億;
(8)55000000=5500萬;
故答案為:32.578,299.85,35.499,4.540949,4.321579,8670,19.6,5500.
點(diǎn)評:本題主要是考查整數(shù)的改寫,注意整數(shù)的改寫要帶計數(shù)單位.