CCSS
Convert unit
among
different-sized
measurement
units within
AF 1.4G5.MD.1
Express simple
conversions
in standard
symbolic
form
a given measurement system (e.g., convert 5 cm to 0.05 m), and use these conversions
(e.g., ___
___ feet 12).
in solving multi-step,
realinches
world problems.
UNDERLYING SKILLS AND CONCEPTS:
customary units (length);
balance equations
Convert Between Feet and Inches
There are 12 inches in 1 foot.
12 inches 1 foot
You can use multiplication to
find the number of inches when
you know the length in feet.
E x am p l E
To change smaller units
to larger units,
use division.
1
Leon wants to go on a ride at
an amusement park.
Leon is 4 feet tall.
Is he tall enough to go on the ride?
.
How do you know?
Leon knows that he is 4 feet tall.
So, he can figure out how many inches
tall he is by using this equation.
4 12 number of inches
4 12 48 inches
7 12 ■ inches
7 12 84
7 feet 84 inches
page 290
6
5
4
number of feet 12 number of inches
3
Change 7 feet to inches.
2
2
feet 1
E x am p l E
7
Leon is tall enough.
Chapter 25 – Lesson 1
C – © CSL Associates, Inc. All rights reserved.
a
K
ey Ide
To change larger units
to smaller units,
use multiplication.
Name
P RAC T I C E
Complete the table.
1.
Feet
1
2
Inches 12 24
3
4
5
1 foot 12 12 inches
3. Kelly bought 9 feet of rope at
the hardware store. How many
inches of rope did she buy?
12 9 108 inches
C – © CSL Associates, Inc. All rights reserved.
7
48
Write an equation to solve.
2. Kiki planted some flowers
1 foot apart. How many inches
are there between each plant?
4. Ramon had 144 inches of rope.
He used 10 feet of it. How
much rope was left over?
144 120 24 inches
or 2 feet left
Math
Reasoning
6
8
9
10 11 12
120
5. How many 3-foot lengths of
board can Mr. Cho cut from a
board that is 96 inches long?
36 ? 96 inches
He can cut two 3-foot
lengths. He will have 2 feet
of board left over.
6. Anita had 120 inches of ribbon.
How many feet of ribbon is
that?
12 ? 120 inches
10 feet of ribbon
Conversions
MR 3.0
7. There are 3 feet in 1 yard.
How many inches are there in 6 yards?
Explain.
216 inches; Possible explanation. If there are 3 feet in
1 yard, then there are 3 12, or 36 inches in 1 yard. Now
multiply 6 36 to find the number of inches in 6 yards.
Chapter 25 – Lesson 1
page 291
MCX94.HW.CL.G3.FM&Lesson.v211
8/3/04
13:57
Page 194
Name
…at home!
P RAC T I C E
Feet
1
2
3
4
Inches 12 24
5
7
8
48
Write an equation to solve.
2. Annie planted some bushes
2 feet apart. How many inches
are there between each bush?
2 feet 12 24 inches
3. Rosa bought 6 feet of rope at
the hardware store. How many
inches of rope did she buy?
12 6 72 inches
4. Matt had 132 inches of rope.
He used 10 feet of it. How
much rope was left over?
132 120 12 inches
or 1 foot left
Math
Reasoning
6
9
10 11 12
120
5. How many 3-foot lengths of
board can Mr. Barrett cut from a
board that is 84 inches long?
36 ? 84 inches
He can cut two 3-foot
lengths. He will have 1 foot
of board left over.
6. Bonnie had 144 inches of
ribbon. How many feet of
ribbon is that?
12 ? 144 inches
12 feet of ribbon
Conversions
MR 3.0
7. There are 3 feet in 1 yard.
How many inches are there in 5 yards?
Explain.
180 inches; Possible explanation. If there are 3 feet in
1 yard, then there are 3 12, or 36 inches in 1 yard. Now
multiply 5 36 to find the number of inches in 5 yards.
page 194
Home Resource and Homework
Chapter 25 Lesson 1
C – © CSL Associates, Inc. All rights reserved.
Complete the table.
1.
MCX94TEG3Ch01_32.v8.9.3 2/21/01 14:51 Page 535
Name
P RAC T I C E
Complete the table.
1.
Feet
1
2
3
4
5
6
7
8
9
10 11 12
Inches 12 24 36 48 60 72 84 96 108 120 132 144
Write an equation to solve.
2. Kiki planted some flowers
1 foot apart. How many inches
are there between each plant?
1 foot 12 12 inches
3. Kelly bought 9 feet of rope at
the hardware store. How many
inches of rope did she buy?
C – © CSL Associates, Inc. All rights reserved.
12 9 108 inches
4. Ramon had 144 inches of rope.
He used 10 feet of it. How
much rope was left over?
144 120 24 inches
or 2 feet left
Math
Reasoning
5. How many 3-foot lengths of
board can Mr. Cho cut from a
board that is 96 inches long?
36 ? 96 inches
He can cut two 3-foot
lengths. He will have 2 feet
of board left over.
6. Anita had 120 inches of ribbon.
How many feet of ribbon is
that?
12 ? 120 inches
10 feet of ribbon
Conversions
MR 3.0
7. There are 3 feet in 1 yard.
How many inches are there in 6 yards?
Explain.
216 inches; possible explanation. If there are 3 feet in
1 yard, then there are 3 12, or 36 inches in 1 yard. Now
multiply 6 36 to find the number of inches in 6 yards.
Chapter 25 – Lesson 1
Student Book Page
page 291
Name
…at home!
P RAC T I C E
Complete the table.
1.
Feet
1
2
3
4
5
6
7
8
9
10 11 12
Inches 12 24 36 48 60 72 84 96 108 120 132 144
2 feet 12 24 inches
3. Rosa bought 6 feet of rope at
the hardware store. How many
inches of rope did she buy?
12 6 72 inches
4. Matt had 132 inches of rope.
He used 10 feet of it. How
much rope was left over?
132 120 12 inches
or 1 foot left
Math
Reasoning
5. How many 3-foot lengths of
board can Mr. Barrett cut from a
board that is 84 inches long?
36 ? 84 inches
He can cut two 3-foot
lengths. He will have 1 foot
of board left over.
6. Bonnie had 144 inches of
ribbon. How many feet of
ribbon is that?
12 ? 144 inches
12 feet of ribbon
Conversions
MR 3.0
7. There are 3 feet in 1 yard.
How many inches are there in 5 yards?
Explain.
180 inches; Possible explanation. If there are 3 feet in
1 yard, then there are 3 12, or 36 inches in 1 yard. Now
multiply 5 36 to find the number of inches in 5 yards.
page 194
Home Resource and Homework
Chapter 25 Lesson 1
C – © CSL Associates, Inc. All rights reserved.
Write an equation to solve.
2. Annie planted some bushes
2 feet apart. How many inches
are there between each bush?