Dec 25, 2015
1. Convert to an improper fraction.
2. Convert to a mixed number.
3. Write in simplest form.
4. Write a fraction that is equivalent to .
534
4
25
18
4
7
3
Least Common Multiple (LCM):
◦ The smallest multiple that is common to 2 or more #’s.◦ Multiples happen when U count by a #
Example: Find LCM(6,9) Count by 6:
6 12 18 24 30 36 … Count by 9:
9 18 27 36 …
Find the Least Common Multiple (LCM) of 4 and 5
◦Count by 5: 5 10 15 20 25 30 35 …
◦Count by 4: 4 8 12 16 20 24 28 …
20 is the LCM of 4 and 5
Find the Least Common Multiple (LCM) of 4 and 5
◦Count by 5: 5 10 15 20 25 30 35 …
◦Does 4 go into 5 evenly? No.
◦Does 4 go into 10 evenly? No.
◦Does 4 go into 15 evenly? No
◦Does 4 go into 20 evenly? YES!! Bingo!!!
20 is the LCM of 4 and 5
Find the value of .
The fractions already have common denominators.
Add numerators.
Write in simplest form.
10
7
10
1
10
8
10
71
10
7
10
1
5
4
10
8
1. Get the bottoms the same by making equivalent fractions (multiply top AND bottom by the same #)
(using the least common denominator is optional).
2. Add or subtract the numerators.
3. Write the sum or difference over the common denominator.
4. Write the fraction in simplest form.