## Reflection: Staircase of Complexity Stop, Look and Check (Part 2) - Section 1: Review

The Common Core standards do not include the teaching of the subtraction algorithm in second grade, but they do suggest that students solve double-digit addition and subtraction problems within 100 using place value strategies. My purpose here is to provide one way to access those strategies. I still provide students with base 10 blocks, tens frames and encourage drawings, but I know that some students are ready for a more abstract representation for solving problems (MP2).

For this reason, I provide students with specific strategies that a competent math student uses automatically to solve problems. Stop, Look and Check is one of these strategies. Adults do it automatically. They look to see if they need to borrow, but it is a subconscious process. I am bringing the process to the forefront for students to understand what they are actually doing when they solve a problem.

We can teach the steps that a competent math student uses automatically, as well as watching for students to figure out a method on their own. In both of these we are encouraging students to think about their own work and to reason mathematically (MP2) which is fundamental to the Common Core.

Beyond Common Core
Staircase of Complexity: Beyond Common Core

# Stop, Look and Check (Part 2)

Unit 18: Strategies That Work
Lesson 9 of 16

## Big Idea: Learning the process of subtraction is not enough, you need to be able to know when to use it.

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Standards:
Subject(s):
Math, Number Sense and Operations, Operations , subtraction, reasoning, review, estimation
65 minutes

### Beth McKenna

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