Lesson 9.12 Subtract Mixed Numbers
I can subtract mixed numbers
Steps
1. Subtract the fractions (use notes from 9.2/9.3 & 9.5/9.7)
2. Subtract the whole numbers
3. Make sure the answer is in simplest form.
Example:
9
−5
Subtract the
whole #’s
3
4
1
3
3
9
-5
−
4
3
4
1
3
subtract the
4
1
fractions
3
=
=
9
12
4
12
9
−
12
4
12
5
12
combine
answers
4
5
12
find a common
denominator (12)
subtract the
numerators (9 - 4)
check for simplest form
Samples
Subtract. Show your work. Write your answer in simplest form.
7
3
8
8
1) 8 − 3 =
2) 11
5
16
−3
1
16
=
2
3) 5 − 4 =
3
1
1
2
4
5
1
6
2
4) 6 − 2 =
5) 3 − 1 =
6) 8
5
12
1
−8 =
3
2
1
3
6
7) 16 − 10 =
5
2
6
9
8) 6 − 3 =
9) 8
7
10
2
− =
5
3
1
8
12
10) 7 − 4
=