Review of Introductory Mathematics
FRACTIONS
Comparing this list to the others, the denominators of 3, 12, and 6
can all be calculated from the list, but 7 cannot be, so a 7 must be
included in the list.
2 x 2 x 3 x 7 = 84
Step 3:
Rewrite the equation
1
7
12
12
2
3
28
28
11
12
7
7
4
6
14
14
Step 4:
Add
12
84
56
84
77
84
56
84
201
84
Addition and Subtraction
Denominators of fractions being added or subtracted must be the same.
The resulting sum or difference is then the sum or difference of the numerators of the fractions
being added or subtracted.
Examples:
=
= 1
2
3
1
3
2
1
3
=
=
4
7
1
7
4
1
7
5
7
=
=
4
9
2
9
4
2
9
2
9
=
=
8
11
2
11
5
11
8
2
5
11
1
11
Rev. 0
Page 33
MA-01
