Suppose you want to add the fractions 3⁄7 and 4⁄5.
To get the numerator of the answer, cross-multiply. In other words, multiply the numerator of each fraction by the denominator of the other. continue reading…
Suppose you want to add 12.96, 3.5 and 8.
Line up the decimal points.
Begin adding from the right-hand column. Treat the blank spaces after 3.5 and 8 as zeroes.
Add first column.
Continue to the left.
Complete the problem column by column, and at the end, put the decimal point directly below the others. continue reading…
Suppose we want to add 26 and 79
Stack the numbers one on top of another so that the ones digits line up in a column and the tens digits line up in another column.
Add column by column, starting from the ones column on the right. continue reading…
