=
=
=
=
直接写得数
2.4×5= 1÷×5= 242.4÷12= 23÷10%=
+
=
﹣
+
= 12×(
+
)=
×3÷
×3= 1÷0.2÷0.5= 502﹣399=
5﹣+
= 0.9+99×0.9=
我会填.+
= ;
﹣
= ; ﹣
=
;
﹣ =
;1﹣ =
;
+ =1.
口算
(1)70×80= 3.7×0.5= 3.2×100= 8.9﹣3.8=
(2)3.8+2.5+6.2= 12﹣6.2﹣3.8= 1.7+0.43+3.3= 3.4﹣1.5﹣0.5=
(3)+
﹣﹣
= 1.4×5= 650﹣470= 79+2.1=
(4)3.14×3= 6.7+3.4= 2.01×0.4= +
=
(5)3.99+5.2= 23+6.68= 7×0.08= 0.25×0.4=
(6)22×0.2= 99.9+1= 0.72÷6= 3.9÷1.3=
(7)0.8×0.8= 5.88+3.12= 1.9+2.1= 26÷2.6=
(8)340÷17= 9.3÷0.3= 13×4= 3.6×5=
(9)1.5×4= 20×16= 28×3= 3.2÷4=
(10)0.28×100= 3200÷1000= 0.5×100= 4×0.125=
(11)340+120= +
= 2.5÷5= 4.95×10=
(12)12﹣﹣
= 1÷0.25= 5×0.13= 12×0.05=
(13)3.08÷0.1= 0.35×6= 25÷0.5= 1.5×3=
(14)4.3﹣2.7= 8.1÷0.9= 12÷1.2= 0.48÷6=
(15)2.6÷26= 0.72×5= 4.8+3.2= 5.7÷0.3= .
400×5= 42÷9=
32÷6= 76﹣28=
1﹣=
+
=
﹣
= 48厘米+32厘米= 分米
195×5≈ 306+298≈
410×6≈ 180分= 时
1米﹣6分米= 分米 1吨﹣400千克= 千克.