## ◂Math Worksheets and Study Guides First Grade. One Less, One More

### The resources above correspond to the standards listed below:

#### Arizona's College and Career Ready Standards

AZ.1.OA. Operations and Algebraic Thinking (OA)
1.OA.B. Understand and apply properties of operations and the relationship between addition and subtraction.
1.OA.B.4. Understand subtraction as an unknown-addend problem within 20 (e.g., subtract 10 - 8 by finding the number that makes 10 when added to 8).
1.OA.C. Add and subtract within 10.
1.OA.C.6. Fluently add and subtract within 10.
AZ.1.NBT. Number and Operations in Base Ten (NBT)
1.NBT.A. Extend the counting sequence.
1.NBT.A.1. Count to 120 by 1's, 2's, and 10's starting at any number less than 100. In this range, read and write numerals and represent a number of objects with a written numeral.
1.NBT.C. Use place value understanding and properties of operations to add and subtract.
1.NBT.C.4. Demonstrate understanding of addition within 100, connecting objects or drawings to strategies based on place value (including multiples of 10), properties of operations, and/or the relationship between addition and subtraction. Relate the strategy to a written form.