836÷4的商大约是 .
240的80倍是 ,48个309的和是 .
小明每天背35个单词,照这样计算,他3天能背 个单词,他30天能背 个单词.
26×50的积的末尾有 个0.
填一填.70+70+70+70= × = 51×4= × + × = + = 700+700+700= × = 3×400= + + = × =90+90+90+90= .
460的8倍是 ,5个376的和是 .