Number and operations in base ten

2.NBT.A.2

Count within 1000, and skip-count by 5s, 10s and 100s.

Practice for this standard

Counting and number sense

Counting on, skip counting, number recognition and the early number sense that everything else is built on.
Patterns and sequences

Repeating and growing patterns, term-to-term rules, and finding the nth term.

Official wording and the full standard: CCSS.MATH.CONTENT.2.NBT.A.2