5. 判断。(对的打“√”,错的打“×”并改正)


201
× 5
------
105 (
460
× 5
------
230 (
330
× 4
------
1320 (
605
× 4
------
2420 (
570
× 6
------
342 (
803
× 4
------
312 (
201
× 5
------
105 (
×,改正:$\begin{array}{r}201\\ ×\ \ 5\\ \hline1005\end{array}$
) 460
× 5
------
230 (
×,改正:$\begin{array}{r}460\\ ×\ \ 5\\ \hline2300\end{array}$
) 330
× 4
------
1320 (
√
) 605
× 4
------
2420 (
√
) 570
× 6
------
342 (
×,改正:$\begin{array}{r}570\\ ×\ \ 6\\ \hline3420\end{array}$
) 803
× 4
------
312 (
×,改正:$\begin{array}{r}803\\ ×\ \ 4\\ \hline3212\end{array}$
)答案
×,改正:$\begin{array}{r}201\\ ×\ \ 5\\ \hline1005\end{array}$
×,改正:$\begin{array}{r}460\\ ×\ \ 5\\ \hline2300\end{array}$
√
√
×,改正:$\begin{array}{r}570\\ ×\ \ 6\\ \hline3420\end{array}$
×,改正:$\begin{array}{r}803\\ ×\ \ 4\\ \hline3212\end{array}$
×,改正:$\begin{array}{r}460\\ ×\ \ 5\\ \hline2300\end{array}$
√
√
×,改正:$\begin{array}{r}570\\ ×\ \ 6\\ \hline3420\end{array}$
×,改正:$\begin{array}{r}803\\ ×\ \ 4\\ \hline3212\end{array}$
6. 填一填。

360×5→
280×5→
210×5→
950×5→
190×7→
109×7→
250×7→
205×7→
360×5→
1800
280×5→
1400
210×5→
1050
950×5→
4750
190×7→
1330
109×7→
763
250×7→
1750
205×7→
1435
答案
$360× 5 = 1800$;
$280× 5 = 1400$;
$210× 5 = 1050$;
$950× 5 = 4750$;
$190× 7 = 1330$;
$109× 7 = 763$;
$250× 7 = 1750$;
$205× 7 = 1435$。
$280× 5 = 1400$;
$210× 5 = 1050$;
$950× 5 = 4750$;
$190× 7 = 1330$;
$109× 7 = 763$;
$250× 7 = 1750$;
$205× 7 = 1435$。
7. 在○里填上“>”“<”或“=”。
0×999+1○
0×9○
260×0○
506×8○
501×9○
504×5○
690×7○
380×5○
700+56○
0×999+1○
>
0 0×9○
<
0+9 260×0○
<
260-0 506×8○
>
400+48 501×9○
>
4500 504×5○
=
630×4 690×7○
<
800×6 380×5○
=
1900 700+56○
<
180×7答案
0×999+1>0
0×9<0+9
260×0<260-0
506×8>400+48
501×9>4500
504×5=630×4
690×7<800×6
380×5=1900
700+56<180×7
0×9<0+9
260×0<260-0
506×8>400+48
501×9>4500
504×5=630×4
690×7<800×6
380×5=1900
700+56<180×7
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