1. 口算。
743 + 223 = 730 - 380 = 650 + 76 = 445 - 331 =
600 - 53 = 4 × 7 + 0 = 570 + 300 = 600 - 320 =
8 + 2 × 6 = 709 - 205 = 242 - 64 = 170 + 570 =
743 + 223 = 730 - 380 = 650 + 76 = 445 - 331 =
600 - 53 = 4 × 7 + 0 = 570 + 300 = 600 - 320 =
8 + 2 × 6 = 709 - 205 = 242 - 64 = 170 + 570 =
答案
743 + 223 = 966
730 - 380 = 350
650 + 76 = 726
445 - 331 = 114
600 - 53 = 547
4 × 7 + 0 = 28
570 + 300 = 870
600 - 320 = 280
8 + 2 × 6 = 20
709 - 205 = 504
242 - 64 = 178
170 + 570 = 740
730 - 380 = 350
650 + 76 = 726
445 - 331 = 114
600 - 53 = 547
4 × 7 + 0 = 28
570 + 300 = 870
600 - 320 = 280
8 + 2 × 6 = 20
709 - 205 = 504
242 - 64 = 178
170 + 570 = 740
2.
小军家购买了一个大鱼缸,他和爸爸妈妈一起观察鱼缸里的小鱼。下面几幅图分别是谁看到的?想一想,填一填。
() () ()
答案
(妈妈)
(爸爸)
(小军)
(爸爸)
(小军)
3. 笑笑和爸爸一起去爬山,图(

②
)是在山脚下看到的风景,图(③
)是爬到半山腰看到的风景,图(①
)是在山顶看到的风景。(填序号)答案
3.② ③ ①
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