 Subtraction, that is our math lesson for today. There are three birds on a branch of a tree. If one bird flies away, how many birds are left on the branch? For us to find the answer, we shall do subtraction. There are three birds on the branch of the tree. One flies away. So we shall subtract one from three. And the answer is two. Three minus one equals two. That is a subtraction sentence. Or we can say three take away one equals two. Three minus one equals two is a subtraction sentence. Three is the minimum, the number from which we subtract. One is the subtrend, the number which we subtract or take away. And two is the difference, the answer in subtraction. Let's try to do some subtraction drills. Five minus two equals three cameras, right? One minus three equals four guitars, six minus one equals five keys, three minus three equals zero diamonds, five minus zero equals five bells, correct? So that is subtraction. I hope you learned a lot today. Have a nice day children.