Common Core Alignment:.

2.NBT.2:

Number And Operations In Base Ten

Understand Place Value.

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

3.NBT.2:

Number And Operations In Base Ten

Use Place Value Understanding And Properties Of Operations To Perform Multi-Digit Arithmetic

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and-or the relationship between addition and subtraction.