1. 竖式计算。
$\begin{array}{r}356\\-158\\\hline\end{array}$ $\begin{array}{r}603\\-156\\\hline\end{array}$ $\begin{array}{r}603\\-298\\\hline\end{array}$
$\begin{array}{r}356\\-158\\\hline\end{array}$ $\begin{array}{r}603\\-156\\\hline\end{array}$ $\begin{array}{r}603\\-298\\\hline\end{array}$
答案:
198 447 305
2. 森林医生。(对的画“√”,错的画“×”,并改正)
$\begin{array}{r}258\\+343\\\hline501\end{array}$ 改正: ( )
$\begin{array}{r}600\\+426\\\hline274\end{array}$ 改正: ( )
$\begin{array}{r}258\\+343\\\hline501\end{array}$ 改正: ( )
$\begin{array}{r}600\\+426\\\hline274\end{array}$ 改正: ( )
答案:
3. 开火车。(填一填)

答案:
685 822 366 706 554 448 807 644 796 508
4. 算一算。
68 + 450 + 346 724 - 458 - 173 476 - 152 + 136
498 - 215 + 645 648 + 256 - 532 148 - 72 + 158
68 + 450 + 346 724 - 458 - 173 476 - 152 + 136
498 - 215 + 645 648 + 256 - 532 148 - 72 + 158
答案:
864 93 460 928 372 234
口算天天练
48 - 26 =
35 - 21 =
97 - 48 =
60 - 40 =
63 - 29 =
30 - 10 =
45 - 30 =
80 - 10 =
70 - 10 =
66 - 60 =
50 + 41 =
60 + 32 =
70 + 12 =
40 + 52 =
60 + 55 =
48 - 26 =
35 - 21 =
97 - 48 =
60 - 40 =
63 - 29 =
30 - 10 =
45 - 30 =
80 - 10 =
70 - 10 =
66 - 60 =
50 + 41 =
60 + 32 =
70 + 12 =
40 + 52 =
60 + 55 =
答案:
口算天天练
56 - 47 =
49 - 38 =
66 - 57 =
34 - 28 =
56 - 48 =
78 + 51 =
29 + 13 =
83 + 50 =
42 + 20 =
40 + 88 =
50 - 50 =
60 - 16 =
40 - 13 =
22 - 20 =
50 - 21 =
56 - 47 =
49 - 38 =
66 - 57 =
34 - 28 =
56 - 48 =
78 + 51 =
29 + 13 =
83 + 50 =
42 + 20 =
40 + 88 =
50 - 50 =
60 - 16 =
40 - 13 =
22 - 20 =
50 - 21 =
答案:
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