teen numbers
addition
subtraction
bigger numbers
before/after
100

Leo

16

100

Tristan

5+3

100

Graham

12-2

100

Ahmie

24

100

Leo & Lionel

Before

7

200

Leighton

13

200

Dean

10+4

200

Henry

8-4

200

Aria

37

200

Leighton & Tristan

Before

10

300

Willow

15

300

Gigi

6+2

300

Andrus

13-2

300

Amari

45

300

Mary Jo & Amari

After 10

400

Kennedy

12

400

Lily

3+2

400

Willow & Aria

10-3

400

Graham & Lily

68

400

Andrus & Gigi

After 

16

500

Mary Jo

19

500

Lionel

9+1

500

Ahmie & Kennedy

5-4

500

Dean & Henry

72

500

Bonus for everyone!

What month comes after March?