The number between 13 and 15 is 14. After means one more. Before means one less.
Worked example
What number comes just before 19?
Answer:18
Count back from 19: the number before is 18. Answer: 18.
For grown-ups: Count on from any number. Below: three problems to try with the worked answers, and a free printable sheet. Children can practise the same skill as a game, with no sign-up and no ads.
CCSS K.CC.A.2
What this practises, for teachers
Practices count on from any number (K.CC.A.2). A printable sheet with its answer key, worked answers on the page, no accounts.