This set of 20 questions is aligned with CCSS.Math.Content.2.NBT.B.5
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Add up to four two-digit numbers using strategies based on place value and properties of operations.
It is recommended that along with these task cards, the students have tools to help solve. In this file I have created a number line from 0 to 100. Base Ten blocks would be helpful as well.