Addition and Subtraction Within 20
This week we will focus on addition and subtraction within 20.
MCC2.OA.2 Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.
"What Makes Ten?"
(Watch this video to review the sums of ten.)
What is a number bond?
(part-to-whole and whole-to-part number relationships)
Click on the Rekenrek below to use the virtual tool.
(A Rekenrek is a tool that helps students generate a variety of addition and subtraction strategies,
including doubles, doubles plus 1, making tens, and compensation.)
Ten Frame Games Number Bonds Game (10)
Number Bonds Game (20) Addition & Subtraction Word Problems