standard_description: Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
problem_activity: Stage 1: Within 10
Required Preparation
Materials to Copy
Blackline Masters
Number Puzzles Addition and Subtraction Stage 1 Gameboard
Number Puzzles Digit Cards

Narrative
Students work together to use digit cards to make addition and subtraction equations within 10 true. Each digit card may only be used one time on a page.


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