Addition+and+Subtraction

=There are three tasks for Addition and Subtraction.=

1. Watch each of the videos below.

 * media type="youtube" key="byTIRd74ryo" height="364" width="445" || media type="youtube" key="yteDWPyeNYI" height="364" width="445" ||
 * media type="youtube" key="ZYHjT0m_iyQ" height="364" width="445" || = media type="custom" key="5461953" = ||
 * media type="youtube" key="XY2-NSVKRoY" height="364" width="445" || media type="youtube" key="27CJH60xwuA" height="364" width="445" ||

==2. Practice a total of 20 addition and subtraction problems using [|Addition, Subtraction, Multiplication and Division of Negative Numbers]. You will need a piece of scrap paper to do some calculations and to record your percentage.==