Appendix: Implementing District Standards
Number and Operations in Base Ten (NBT)
9. Explain why addition and subtraction strategies work, using place value and the
properties of operations.
Operations and Algebraic Thinking (OA)
2. Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know
from memory of two one-digit numbers.
4. Use addition to find the total number of objects arranged in rectangular arrays up to 5
rows up to 5 columns; write an equation to express the total as a sum of equal addends.
Measurement & Data (MD)
6. Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to numbers 0, 1,2 , …,and represent whole-number sums and differences within 100 on a number line diagram.
This unit addresses four of the Common Core Standards Math standards. Students will understand the digits in the hundred, tens, and ones place by understanding and using place value to solve addition and subtraction problems. (# 9 and #4) Students will be able to add and subtract to 20. (# 2) Students will also use the number line to begin to understand how to measure objects. (#6)
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