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Answer:
1.)Step 1 of 2: Add.
Add
1 over 4
1
4
+
5 over 7
5
7
=
27 over 28
27
28
Step 1 of 2: Add, sub-step a: Find common denominator.
Find common denominator
1 over 4
1
4
+
5 over 7
5
7
=
( 1 × 7 ) over ( 4 × 7 )
1 × 7
4 × 7
+
( 5 × 4 ) over ( 7 × 4 )
5 × 4
7 × 4
=
7 over 28
7
28
+
20 over 28
20
28
28 is the least common multiple of denominators 4 and 7. Use it to convert to equivalent fractions with this common denominator.
Step 1 of 2: Add, sub-step b: Add.
Add
7 over 28
7
28
+
20 over 28
20
28
=
( 7 + 20 ) over 28
7 + 20
28
=
27 over 28
27
28
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