2nd Grade Addition
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Adding Ones and Tens
Addition by Counting On
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.
Adding Using Ten Frames
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.
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Explain Addition by Decomposing Numbers
This lesson demonstrates how to break apart numbers to make them easier to add. The lesson shows many different ways to break apart the same number. It also models how to use the break apart to solve problems using place value blocks and an open number line.
Addition Games
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Basic Operations
Learn basic addition and subtraction
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Sum shower
How to play: The hedgehog has to collect the number in the top of the screen. To choose Add or Subtract, hit the balloons containing – and +. By hitting a balloon containing a number, you will add or subtract the number with the result. You need to count quickly, because if you are taking too long, your chance will be over and you will get a new number.
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Frogsum 4
How to play: Catch all the flies as quickly as possible by solving the sums
