math
You have 3 red balloons and someone gives you 2 more.
You start with 3 balloons, and someone gives you 2 more, so you add them together: 3 plus 2 equals 5 balloons in all.
4 is too few, since you'd be forgetting one of the balloons someone gave you, and 6 is too many, since no extra balloon appeared out of nowhere.
Adding is simply putting two groups together to make one bigger group, and you can check it by actually counting all the balloons out loud, one by one, up to 5!
math
What time is it when both hands point to 12?How many corners does a square have?How many sides does a triangle have?What are you counting by when you skip like this?How many cookies are left on the plate?What is the seventh and last day of the week?How much is one half?What color comes next?How many is a dozen?What do we call shapes whose two halves match?What do we call a number that can only be divided evenly by itself and 1?What do we call numbers you can split into two equal groups?Quration — Quration Kids