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=______.