5 分数的加法和减法
口算.
80÷4= 5000+20= 6400﹣400= 8×500= 5×12= 96÷3=
90﹣55= 44+38= 61﹣56= 130×3=
=
=
5000÷125×8= 376+86﹣176= ﹣210=210
45+55÷5= 24×5﹣50= 0÷23+23=
+
+1= 估算:298×71≈ 估算:368÷94≈
直接写出得数.
90÷3= 12×4= 68÷2= 200+3000=
80﹣46= 77÷7= 50×3= 5600﹣600=
54+36= 42+35=
+
= 4000+3000=
37+25= 69÷3=
+
= 10000﹣4000=
82﹣82÷41= 240×5= ÷25=
40200﹣75+25= 25×7×4= 1000﹣ =875
1250×8= 6000÷50= 1﹣
=
﹣
=
写出得数.
232÷6≈
28×23≈
+
=
+1.8=
0.94+2.06=
0×0+4=
25×40=
888+222=
80×70=
50×40=
600÷6=
0÷4×8=
直接写出得数.
1.9+1.1= 2﹣0.98= 13.7+0.03= 4.1﹣3.3= 4﹣0.04= 3.8﹣2.8=
7.9﹣0= 6﹣5.2= 0.7×10= 3.005×100= 60÷1000 1.52÷10=





比
多多少?
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=
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+
=
+
=
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.
﹣
+
(2)25﹣
﹣
(3)
+
+
﹣(
) (5)3﹣(
﹣
) (6)
+
﹣(
+
)





.
.
+
+
+
②5﹣
﹣
③
×20+
×20.
+
﹣
﹣(
+
)
﹣(
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)
+
+
+
.
+
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②
﹣
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③
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) ⑤
+
+
+
=
+
=
﹣0.125=
﹣
=
+0.3= 10﹣
=
﹣
+
﹣
﹣(
﹣
)
﹣
﹣
﹣(10﹣6)÷8.
吨,剩下的比用去的少
吨,这堆沙子原有多少吨?
﹣
.


+
=
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+
=
+
=
﹣
=
﹣
=
+
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(2)
(3)
(5)
(6)
.
+
= 1﹣
=
+
=
﹣
=
+
=
﹣
= 1+3
= 2﹣
=
+0.875= 1﹣
﹣
= 5÷0.1= 125×8=
=
+
=
﹣
=
+
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+
=
﹣
+
=
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=
+
+
+
﹣
+
3﹣
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+
) 5﹣(0.5﹣
)
+
﹣
﹣
.
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