Add Mixed Numbers
7-4
A stock gained 1^38 points on Monday and
2 ^18 points on Tuesday. What was the total
gain for the two days?
To find the total gain, s, add: 1^38 2 ^18 s.
First estimate: 1^38 2 ^18 .
1 2 3
Then add.
To add mixed numbers with likedenominators:
Add the fractions.
Add the whole numbers.
Express the sum in simplest form.
The total gain of the stock was 3
1
2 points.
To add mixed numbers with unlikedenominators:
Find the LCD of the fractions.
Rename each fraction as an
equivalent fraction with the
LCD as the denominator.
Add. Express the sum in
simplest form.
Study these examples.
17 11 ^58 11 .^58
05 ^34 05 .^68
05 ^34 16 ^181 16 1 ^38 17 ^38
1 ^38
2 ^18
3 ^48 3 ^12
s 3
1
2
14 1
1
0 ^14 3
3
0
26 1
1
5 26 3
2
0
26 115 40 350 40 ^16
simplest
form
4
3
2
1
0
(^138)
(^218)
Add whole numbers.
Bring down the fraction.
Rename
09 the sum.
1
3
6
26 136
simplest form
Think
3
1
2
is close to the estimate of 3.
Think
LCD of 10
and 15 is 30.
8206-2_228-229 10/7/07 11:26 AM Page 228