Lesson 90
Frontal Lobe
The human brain is divided into four lobes. The lobes
are separated by the various grooves and bumps on
the surface of the brain. Each lobe performs a
different function. The lobes are called the frontal
Occipital lobe, occipital lobe, parietal lobe, and temporal lobe.
Lobe
The parietal lobe may be divided into four equal
sections. If the total surface area is 28 13 square
inches, what is the surface area of each section?
Parietal
Lobe
Temporal Lobe
28 13 ÷ 4
85
3
÷
4
1
Rename the mixed number
as an improper fraction.
Use the shortcut:
85
1
3 × 4
85
1
12 = 7 12
Rename the whole number
as a fraction.
Solve 2 23 ÷
2
3.
1
2
3
Rename the improper
fraction as a mixed number.
2
3
1
2
3
Multiply by the reciprocal.
2
3
Rename the mixed number as
an improper fraction.
Each section
1
is 7 12
square
inches.
2
3
8 ÷ 2
3
3
4
1
Estimating Quotients
8 × 3
21
13
Multiply by the reciprocal.
Cross-cancel.
Rename the improper fraction.
Round each mixed number
to the nearest whole number
to estimate the quotient.
4× 1 = 4 =4
1
1
1
Solve 2 29 ÷ 2 23 .
6 19 ÷ 2 34 Round, then divide.
Rename the mixed numbers.
Multiply by the reciprocal.
Cross-cancel. Multiply.
20 ÷
9
20 ×
9
5
20 ×
9
3
8
3
3
8
1
3 = 5 × 1 = 5
82 3
2
6
6÷3=2
5 23 ÷ 1 15 Round, then divide.
6÷1=6
Solve.
a. 6
7
192
÷ 1 57
b.
3 18 ÷ 56
c.
8
6 25 ÷ 15
d.
2 19 ÷ 2 29
Chapter 7 • Mathematics Grade 6
Divide Fractions and Mixed Numbers
Estimate.
e.
1 34 ÷ 1 16
f.
8 29 ÷ 4 14
g.
9 13 ÷ 3 14
h.
1 78 ÷ 1 29
P
Write each mixed number as an improper fraction. Then write its reciprocal.
1.
4 12
2.
1 58
3.
7 17
4.
3 49
9.
5 67 ÷ 3 18
10.
15 38 ÷ 5 38
5.
8 23
6.
6 19
Estimate the quotient.
7.
11.
4 13 ÷ 2 15
13 14 ÷ 1 29
8.
9 35 ÷ 2 29
12.
23 35 ÷ 5 78
13.
2 ÷4 3
8 31
43
14.
3
17 18
25 ÷ 2 4
7 45 ÷ 35
17.
4 38 ÷ 3 12
18.
5 ÷ 1 17
22.
5 14 ÷ 8 16
Find the quotient.
15.
4 12 ÷ 12
16.
19.
8 13 ÷ 59
20. 5
7
23.
Baby Jessica’s weight at one year was about 2 12 times her
weight at birth. At one-year of age she weighed 22 12 pounds.
What was her weight at birth?
24.
During a 30-minute television program there are about 5 13
minutes of advertising. If each commercial is an average of
2
3 minutes long, how many commercials can be shown?
25.
Elizabeth filled the bird feeder from a 10 12 -pound bag. Every
day she fed the birds with 15 -pound. How many days was she
able to feed the birds from the 10 12 -pound bag?
26.
Lisel is covering the bathroom shelves in her house. She has 11 14 feet of
shelving paper. How many shelves can she cover if each shelf is 1 12 feet long?
÷ 1 23
21. 2
5
÷ 3 35
R
1.
1 12 + 2 14
2.
3 29 + 1 19
3.
8 14 + 2 18
4.
6 78 + 4 18
5.
7 59 + 3 49
6.
2 15 + 3 34
7.
2 78 + 2 18
8.
9 +41
3 10
5
© Copyright 2002
193