If a number is close to tens or hundreds in an addition, can you find a short cut to do it?
If a number is close to tens or hundreds in an addition, can you find a short cut to do it?
在计算加法时，如果有一个加数接近整十、整百，怎样计算简便一些？
If a number is close to tens or hundreds in an addition, can you find a short cut to do it?
在计算加法时，如果有一个加数接近整十、整百，怎样计算简便一些？