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1. 根据每组第一题的积，直接写出下面两题的积。
$25\times3 = 75$ $8\times16 = 128$ $24\times5 = 120$
$25\times30 =$ $8\times160 =$ $24\times15 =$
$25\times300 =$ $8\times1600 =$ $48\times5 =$
$25\times3 = 75$ $8\times16 = 128$ $24\times5 = 120$
$25\times30 =$ $8\times160 =$ $24\times15 =$
$25\times300 =$ $8\times1600 =$ $48\times5 =$
答案
2. 口算下面各题。
$200\times9 =$ $10\times90 =$ $900\times3 =$ $200\times6 =$
$30\times80 =$ $8\times500 =$ $20\times70 =$ $40\times90 =$
$200\times9 =$ $10\times90 =$ $900\times3 =$ $200\times6 =$
$30\times80 =$ $8\times500 =$ $20\times70 =$ $40\times90 =$
答案
3. 根据积的变化规律，直接写出得数。
$230\times20 =$ $4\times120 =$ $300\times30 =$
$40\times700 =$ $60\times500 =$ $50\times110 =$
$230\times20 =$ $4\times120 =$ $300\times30 =$
$40\times700 =$ $60\times500 =$ $50\times110 =$
答案
4. 某型号客车有45个座位，4辆这种型号的客车可以坐多少人？你能运用积的变化规律写出16辆、40辆、160辆和400辆这样的客车各能坐多少人吗?
答案
