Author:
Samuel Shackleford
Subject:
Algebra, Numbers and Operations
Material Type:
Lesson Plan
Level:
Lower Primary
Grade:
1
Tags:
  • Addition Facts; Counting on
  • Number Line
    License:
    Creative Commons Attribution Non-Commercial Share Alike
    Language:
    English
    Media Formats:
    Downloadable docs

    Education Standards

    Addition Fact Strategies - Counting On (+1/+2)

    Overview

    This lesson is intended to help students begin to transition away from a one-to-one correspondence. Students at this point should be able to use concrete ojects to identify values.

    Goal: Students will be able to use a number line to "Count On from Greater"

     

    See the Greater

    Start with working through a few +1/+2 problems where the student has the opportunity to first show how to complete the task using unit blocks. Transition to having the student first show how to combine the two addends using blocks, and then have them present the same expression using a numbered (0 - 20) number line. Take note of which addend the student focuses on to start (lesser or greater). If the student chooses the lesser and counts on from 1, this is a great place to begin introduction to the Commutative Property. Using two colors of connecting cubes have the student show the sum of any +1/+2 problem. Once the student has found the sum, flip the cubes around and ask them to state the new expression and if they notice any similarities. They should see that they are both equivalent.

    Once you transition back to the number line if the student still chooses to begin with the lesser addend, have the student attempt to repeat uses the greater addend and ask her, "Which way allows you to find the sum with less moves?". Also, if the student still uses a one-to-one correspondence with the number line ask them to locate the greater value on the number line first, and then find the sum.

    Next Lesson: After students are comfortable using concrete manipulatives and the number line to find sums within 20 by counting on (+1/+2) they should be ready to move on to ten frames.

    Use the number line to find the sum.