Page 12 - ArithBook5thEd ~ BCC

Sometimes we need to “carry” a digit from one place to the next higher place. For example, when
adding 38 + 47, we first add the ones places, 8 + 7 = 15. But 15 has twodigits: it stands for 1 ten
+5 ones.We “put down” the 5 in the ones place, and “carry” the 1 (standing for a ten)to the tens
column. So we have:

Example 5. Find the sum

38
+4 7

Solution. Put down the 5 in the ones place:

38
+4 7
5

and carry the 1 to the top of the tens column:

{1}
38
+4 7
5

and finish the job by adding up the tens column, including the carried one:

{1}
38
+4 7
85

The sum is 85.

Since carrying alters the sum in the column immediately to the left of the one we are working on,
in multi-digit addition, we always start with the right-most column and proceed leftward.

1.1.3 Exercises

Find the sums, carrying where necessary.
1.

26
+ 5 5

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