Question

636636+6363636+8373737

Answer 1

To add more than two numbers, arrange them as follows:

Notice that they are all aligned from right to left.

Start by adding the numbers on each colum. The first column from right to left, is:

$6+6+7=19$

Write a 9 below the first colum and a 1 above the second column, since we cannot write 19 using one decimal place. Since 19 = 10 + 9, we can bring the 10 together in the column of the tens.

Next, add the numbers on the second column:

$1+3+3+3=10$

Repeating the procedure, write 0 below the second column and 1 above the third one. Continue adding columns until we are finished.

The sum of the third column, is:

$1+6+6+7=20$

For the fourth column, we have:

$2+6+3+3=14$

For the fifth column, we have:

$1+3+6+7=17$

For the sixth column, we have:

$1+6+3+3=13$

For the seventh column, we have:

$1+6+8=15$

Since there are no further columns, write 15 at the leftmost part of the result.

Therefore:

$636636+6363636+8373737=15374009$