This file is 44 pages that correlate with CCSS 1.NBT.C.5, Grade 1. The pages include cut and paste and fill in activities. These pages can be used as homework, guided, or independent practice. Also included in this file are games that can be used in math centers. I have used these games and pages in my own classroom.
1.NBT.C.5 - Given a two digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.