Stupid Pupil

Are you an elementary school student?
Are you smarter than an elementary school student?
If you dare, come and challenge! Let's do some math, and then you will realize how stupid you are.^^
##Rules:##
1. Endless Mode:
- Each round is short, get it right and move on to the next round!
2. 60-Second Race Mode:
- Within 60 seconds, try to get the highest score possible!
- Every correct answer gives you a bit of extra time~
- Get consecutive correct answers in a short time for bonus score~~
- You have three hearts in total. Each mistake will deduct one. Don't lose them all!
##Warning: No calculators allowed!!##