口算大比拼
5×0= 510×7= 1﹣
= 0+0= 297×5≈
= 3000×2= 88×8= 
= 400×3=
26÷5= 
= 2×6+3= 875+25= 5+5×6=
口算大比拼
5×0= 510×7= 1﹣= 0+0= 297×5≈= 3000×2= 88×8= = 400×3=
26÷5= = 2×6+3= 875+25= 5+5×6=
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