Learning to add tens.

I have been using mathletics to help me practice adding my tens.

I worked this one out by adding the two numbers. I know that three plus two equals five so 30 + 20 will be 50 and three plus two will be five and then fifty plus five will be 55 so the answer is 55. 

I like using mathletics sometimes because I just like figuring out other things so that I can get even smarter. Sometimes it is fun and sometimes it is hard but I don't give up.