Page 12 - ArithBook5thEd ~ BCC
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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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