一个长方形苗圃长35米，面积为420平方米．如果长增加增加到70米，宽不变，扩大后的苗圃面积是多少呢？（请用两种方法解答）
口算我最棒= 26×= = = == = = 6.4÷20%= 125%×8=
直接写出得数．×= 1÷= ÷60%= ×15=﹣= 4.5+= ×= 6.8÷10%=
直接写得数24×= 72×= 12÷= ÷3=0÷= 3÷= ×= ﹣×0=
口算×15= ×2= ×= ×=÷= ÷3= ÷5= ÷=
画一画．（1）=（2）÷4=
= 26×
= 
= 
= 
=
= 
= 
= 6.4÷20%= 125%×8=
×
= 1÷
= 
÷60%= 
×15=
﹣
×
= 6.8÷10%=
= 72×
= 12÷
= 
÷3=
= 3÷
= 
×
= 
×0=
×15= 
×2= 
×
= 
×
=
÷
= 
÷3= 
÷5= 
÷
=
=
÷4=
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