We can solve addtion equations simply by using our knowledge of place value, multiples of 10 or 100, sums of 10, and by creating friendly numbers, (numbers that are easy to work with). When solving for example 46+38, we can first solve 46+30=76 then add 76+4 in order to make a friendly number 80.  We then only have 4 more to add which is 84.  Therefore 46+38=84.