口算我最棒.
+
=
+
=
﹣=
﹣
=
+
= 1+
=
﹣0.2=
+0.3=
+
= 1﹣
+
=
﹣
﹣
=
+
+
=
=
=
=
=
0.32=
=
=
=
= 2x+x=
240﹣40÷4= 125×（8+8）= ÷12=6 2000×3+60=
320×11÷32= 1﹣
= 24×5﹣25×4= 8×13×25=
4005÷19≈
口算．
300×7= 40+300= 58÷7= 40×8=
720﹣90= 3200﹣3000= 0×800= 45÷9=
5×60= 4+6×4= 604×3≈ 695×9≈
705+196≈ 397×4≈ 78×5≈
+
=
1﹣
=
﹣
+
= 80﹣20×0=
口算．
380+220= 12×4= 36÷4= 20÷3=
100﹣57= 38×0= 70×8= 400﹣185=
600×5= 2400+560=
+
= 1﹣
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