先估一估，再算一算．
比30千克多 是多少？
4个是多少？
直接写出得数．========
60吨的是多少吨？
快速计算．×3= ×12= ×6= 3×= 4×=20×= 4×= 3×= 100×= 50×=×33= 24×= 35×= 10×= 12×=7×= 200= 0×= ×36= ×15=4×= 26×= 4×1= ×= ×=×=
是多少？
是多少？
=
=
=
=
=
=
=
=
是多少吨？
×3= 
×12= 
×6= 3×
= 4×
=
= 3×
= 100×
= 50×
=
×33= 24×
= 35×
= 10×
= 12×
=
= 
200= 0×
= 
×36= 
×15=
= 26×
= 4
×1= 
×
= 
=
×
=
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