口算．
3×5= 9+36= 29+11= 92﹣12=
4×2= 21﹣12= 1×2= 11+88=
5×4= 1×1= 27厘米+30厘米= 62+9=
58﹣19= 25+30+5= 84﹣8﹣60= 48+20﹣9=
口算．
3×5= 9+36= 29+11= 92﹣12=
4×2= 21﹣12= 1×2= 11+88=
5×4= 1×1= 27厘米+30厘米= 62+9=
58﹣19= 25+30+5= 84﹣8﹣60= 48+20﹣9=
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×
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+
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= 14×
= 1÷60%=
÷
=8 ．
÷2= 6×
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