Think of sum as a magical way to find out how many things you have when you put them together. For example, if you have three red apples and two green apples, the sum is how many apples you have in total. You just count all the apples together, and you get five! So, sum is like counting everything you have to see the big picture.
Imagine your toys are like a puzzle. Each toy is a piece, and when you put all the pieces together, you see the whole picture. The sum is like that complete picture. It shows you how many pieces you have when you fit them all together. So, when you hear sum, think of it as completing your toy puzzle to see how many pieces there are.
Think of sum as a treasure chest. Each coin you put in is like a number. When you put all your coins in the chest, the sum is the total number of coins you have. It tells you how much treasure you have collected. So, sum is like counting all your treasure to see how much you have saved up.