口算4000÷80= 12×20= 48÷3= 13×40= 800÷50=40×20= 16×4= 720÷60= 3×4×25= 3504÷79×0=
6×=×=×3=+=×=×=
直接写得数． ①4×= ②×= ③×28= ④﹣= ⑤7×= ⑥0×= ⑦+= ⑧×= ⑨×= ⑩×=（11）1×=（12）0.125×8=
直接写得数： 15×××××121×．
直接写出得数．×=×=×=×28=+=（+）×12=
直接写得数×60× 1﹣××0×．
=
×
=
×3=
+
=
×
=
×
=
= ②
×
= ③
×28= ④
﹣
=
= ⑥0×
= ⑦
+
×
= ⑩
×
=（11）1×
=（12）0.125×8=
×
×
×
×121
×
．
×
=
×
=
×
=
×28=
+
=（
+
×60
×
1﹣
×0
×
．
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