Math math math!!!

Front

What comes before 47?

Back

46

Front

What comes before 26?

Back

25

Front

Which letter is missing from this shape name? C__BE

Back

U

Front

What comes in between 48 and 50?

Back

49

Front

What comes before 20?

Back

19

Front

What comes before 10?

Back

9

Front

What comes after 30?

Back

31

Front

What comes before 15?

Back

14

Front

What comes in between 20 and 22?

Back

21

Front

What comes before 5?

Back

4