《2025年口算训练二年级数学下册北师大版升级版》

100 + 100 - 200 =
900 - 100 - 200 =
100 + 800 - 30 =
700 + 100 - 54 =
300 + 600 - 67 =
600 - 400 - 87 =
200 - 100 - 45 =
560 + 130 - 45 =
110 + 260 - 300 =
570 - 500 - 30 =
640 + 150 - 400 =
820 - 240 - 321 =
310 + 630 - 4 =

答案：

545 + 455 =
185 + 420 =
820 - 650 =
621 - 382 =
125 + 680 =
930 - 925 =
610 - 375 =
188 + 444 =
750 - 584 =
183 - 90 =
447 + 125 =
721 - 245 =
820 - 594 =

答案：

在$\square$里填上合适的数字。
$\begin{array}{r}3\square5\\+\square9\square\\\hline537\end{array}$ $\begin{array}{r}6\square\\+\square\square7\\\hline404\end{array}$

答案：