Use efficient procedures, and understand why they work, to solve problems involving the addition and subtraction of two- and three-digit whole numbers (including those that require regrouping). 0206.2.8

Links verified on 12/30/2014

1. Addition Facts - Click on a UFO with the math problem, then choose the correct answer on the left.
2. Addition and Subtraction Game - Generate your own game using the numbers you wish.
3. Column Addition Method -This method can be used for adding any addition problems with 2 or more digit numbers, one column (place value) at a time
4. Short Addition Method - performed from right to left adding one place value at a time, re-grouping each place values sum to the next largest place value on the left.
5. Snowy's Friend- Subtraction Game - Practice your math facts while helping Snowy make a new friend!
6. Trade First Subtraction Method - this method is performed from right to left subtracting one place value at a time
7. Partial Sums Addition Method - performed from left to right and can be used for adding any addition problems with 2 or more digit numbers, one place value at a time.