Common core requires students to understand how to add and subtract in relation to counting. These ready to print, no preparation activities are perfect for practice, homework, morning work, centers/stations. These are a sample of a larger packet on my page! http://www.teacherspayteachers.com/Product/Addition-and-Subtractin-Related-to-Cunting-Common-Core-1492372
The packet is great for differentiation. The first sheets are easier and these progressively get harder.
Common Core Standard: CCSS.Math.Content.1.OA.C.5 - Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).