用竖式计算并验算:(1)55×12= (2)49×22= (3)85×36= (4)725÷5= (5)823÷6= (6)639÷8=
(1)55×12=660;
验算:
(2)49×22=1078;
验算:
(3)85×36=3060;
验算:
(4)725÷5=145;
验算:
(5)823÷6=137…1;
验算:
+
(6)639÷8=79…7;
验算:
|
. |
110 |
55 |
660 |
验算:
|
60 |
60 |
60 |
0 |
(2)49×22=1078;
|
. |
98 |
98 |
1078 |
验算:
|
88 |
198 |
198 |
0 |
(3)85×36=3060;
|
. |
510 |
255 |
3060 |
验算:
|
288 |
180 |
180 |
0 |
(4)725÷5=145;
|
5 |
22 |
20 |
25 |
25 |
0 |
验算:
|
. |
725 |
(5)823÷6=137…1;
|
6 |
22 |
18 |
43 |
42 |
1 |
验算:
|
. |
822 |
+ 1 |
823 |
+
1 |
823 |
(6)639÷8=79…7;
|
56 |
79 |
72 |
7 |
验算:
|
. |
632 |
+ 7 |
639 |
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