2 Digit Addition with a Hundreds Chart

A 2nd grade student explains two digit addition, solving 22 +50, using a hundreds chart. He also explains what happens when you navigate up, down, left, and right around the chart.

Add Within 20 by Regrouping on a Ten Frame

Students will understand how to add numbers within 20 by using a tens frame and how this helps them compute numbers quickly and accurately. This will also help them create numbers that add on from 10.

Adding by Using a Hundreds Chart

This video demonstrates two-digit addition using a hundreds chart. The core lesson involves keeping one number whole and decomposing a second. It also shows how using landmark numbers helps add more efficiently. The commutative property of addition is also explained in this demonstration.

Students learn to place counters on a tens frame to complete a group of ten and then add the remaining number.

Doubles and Near Doubles

“When adding near double and one is 1 more, add the two doubles and then 1 more! When they are apart by two, here is what you need to do. Add the two doubles and then 2 more!”

Doubles Plus 1 and Doubles Minus 1 Strategies

A student solves 5 + 6 by using the strategy doubles plus 1 and then models with a picture. She uses doubles minus 1 to solve 5 + 6 another way.