Now, he solves for an unknown in any position. This video addresses Common Core Grade 2 Standard Operations & Algebraic Thinking: Represent and solve problems involving addition and subtraction.

Want to help your first-grader master math ... any two-digit number up to 100. Use concrete models or drawings to show the place values and explain the thinking involved. Understand addition ...

Today, we will be doing word problems with Professor Barble. We'll meet him in a little while. Then we will be adding two-digit numbers. I wanna warm up my math brain with my friend, Professor Barble.

A few weeks ago, I wrote an article for TheAtlantic.com describing some of the problems with how math ... digit numbers until fourth grade. (Currently, most schools teach these skills two years ...

students focus most on using all four operations - addition, subtraction, multiplication, and division - to solve multi-step word problems involving multi-digit numbers. Fourth-grade math extends ...