Easy learning subtraction - Smart frog kids math

Description
This math app is for kids who are in 1 or 2 grade or in the age group 3-7.
Learning addition and subtraction. Small kids can easily practise their math skills. 

How kids can benefit?
- Learn the basics of addition and subtraction.
- Perfect their math skills by select the right answer of number.

Features
- Easy to use interface which small kids can understand
- Fourty eight levels with nine or ten questions in every level
- First level unlocked. Remaining can unlocked by pass the previous level
- Just right for math of 1 or 2 grade or 3-7 years old kids
- Random new questions, whenever you replay.