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小猴今天要闯小狐狸设置的五个关口,小朋友,我们陪他一起闯一闯吧!第一关20以内的退位减法例1.河里有13只小鸭,过了一会儿,有8只小鸭上岸了,又有5只小鸭下到河里,现在河里有几只小鸭?我是这样解的。上岸8只,就是减去8只,下河5只就是加上5只,13-8+5=10(只),所以河里有10只小鸭。第二关认识图形例2.把图1的正方形纸折出半个这样大的小正方形。
Monkey today to break through the set of five small fox mark, children, we go with him to break it! The first level of less than 20 abatement minus Law 1. There are 13 ducklings in the river, after a while, there are 8 Duckling ashore, and five ducklings down into the river, the river now has a few duckling? I was so solution. Landing 8, which is subtracted 8, 5 under the river is plus 5, 13-8 +5 = 10 (only), so the river has 10 ducklings. Example 2 of the second sentence of cognition 2. The square paper of FIG. 1 is folded out of such a large, small square by half.