加法

What is 10 plus 3? 10 加 3 等于什么？
The sum is 13. 总和是 13.
What's 3 plus 2? 3 加 2 是多少？
3 plus 2 equals 5. 3 加 2 等于 5.
Look! 2 more birds came. How many birds are there in all?看！多来了 2 只鸟。一共有多少只鸟？
There were 3 birds already. So there are 5 birds all together.原本有 3 只，所以总共有 5 只。
If we write it in a number sentence, it's 3+2=5. 如果我们写成数学公式的花。就是3+2=5
5 is 2 more than 3. 。5 是 2 加上 3.