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: Numbers to 99 by 1
Required Preparation
Materials to Gather
Dry erase markers
Sheet protectors
Materials to Copy
Blackline Masters
Write the Number Stage 1 Gameboard

Narrative
Students count by 1 and choose whether to count forward or backward. Gameboards go from 39–60, 69–90, and 78–99.


aligns: no