Math after and before 10.11.2020

What comes after number 2?

• 4

• 3

• 5

What comes after number 4?

• 5

• 6

• 7

What comes after number 6?

• 5

• 7

• 8

What comes after number 8?

• 10

• 9

• 7

What comes after number 9?

• 10

• 11

• 8

What comes before number 4?

• 6

• 5

• 3

What comes before number 10?

• 11

• 9

• 8

What comes before number 12?

• 10

• 11

• 13

What comes before number 15?

• 13

• 16

• 14

What comes before number 20?

• 19

• 18

• 17