# Estimate and Measuring in Centimetres

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This booklet covers the following points in detail:
Measuring in Centimetre
Comparing Lengths
Finding Perimeter
1. CHAPTER 5
1 Measuring in Centimetres
Goal Estimate and measure lengths in centimetres.
You will need a centimetre ruler. At-Home Help
It helps to use a personal
1. Use your hands and fingers to estimate reference to estimate lengths
the length of each object. Write your estimates. in centimetres. A child’s fingertip
Then use your ruler to measure. Write the is about one centimetre (1 cm).
measurements. The width of a child’s hand with
10 cm
Estimate Estimates will vary.
Measurement 7 cm
b)
Estimate Estimates will vary.
Measurement 3 cm
Measurement 20 cm or 21 cm
Measurement 27 cm or 28 cm
2. Use your fingers and hands to estimate. Find 2 objects
that you think are each length. Then use a ruler to measure.
For example:
a) 20 cm Object a telephone Measurement Measurements will vary.
Object a picture Measurement Measurements will vary.
b) 60 cm Object width of a TV Measurement Measurements will vary.
Object width of a desk Measurement Measurements will vary.
2. CHAPTER 5
2 Measuring in Metres and Centimetres
Goal Estimate and measure lengths in metres and centimetres.
You will need a measuring tape or a metre stick. At-Home Help
As with centimetres, it helps
1. Use giant steps to estimate each object. to use a personal reference to
Write your estimate. Next, measure the object estimate lengths in metres. The
to the nearest metre. Then measure in metres length of a child’s giant step
and centimetres. The first one is done for you. may be about one metre (1 m).
a) length of a sofa Estimate 2 m
Measurement to nearest metre 2 m
Measurement in metres and centimetres 2 m 4 cm
b) width of a door Estimate 1 m
Measurement to nearest metre 1 m
Measurement in metres and centimetres 0 m 80 cm
c) width of a window Estimate 1 m
Measurement to nearest metre 1 m
Measurement in metres and centimetres 1 m 6 cm
d) length of a table Estimate 2 m
Measurement to nearest metre 2 m
Measurement in metres and centimetres 1 m 83 cm
e) height of a chair Estimate 1 m
Measurement to nearest metre 1 m
Measurement in metres and centimetres 0 m 94 cm
f ) length of a bed Estimate 2 m
Measurement to nearest metre 2 m
Measurement in metres and centimetres 1 m 94 cm
3. CHAPTER 5
3 Comparing Lengths to a Kilometre
Goal Explain how long a kilometre is.
Circle the letters of the items that are about 1 km. At-Home Help
Write the letters that you circled in order below. A kilometre can be difficult to
You should spell a special Canadian event. visualize because it is so large.
The first one is done for you. Think of some places that are
about 1 km away from your
home. It takes about 15 minutes
for a child to walk 1 km.
1. 100
1 km  1000 m
T
2. 1000 schools
A
3. 1000 8. 1000 13. 1000
E Y X
4. 100 9. 1000 snowboards 14. 100 classrooms
F F R
5. 1000 metre sticks 10. 100 15. 100 small houses
R R U
6. 100 11. 1000 desks 16. 1000
S O N
7. 1000 12. 1000
R R
T E R R Y F O X R U N
4. CHAPTER 5
4 Choosing an Appropriate Unit
Choose centimetres, metres, or kilometres to measure
Goal lengths and order lengths with different units.
At-Home Help
Sometimes lengths can be
measured using different units.
For example, you can measure
the height of a door in metres or
centimetres. Often, it is better to
measure in one unit than
another. Part of estimating and
measuring lengths is deciding
which unit or units to use.
1. Complete each statement using centimetres, metres, or kilometres.
a) An oak tree might be about 20 metres tall.
b) A forest might be about 4 kilometres long.
c) The trunk of an oak tree might about be 2 metres around.
d) An oak tree branch might be about 6 metres long.
e) An oak leaf is about 5 centimetres wide.
f ) An acorn is about 3 centimetres long.
2. Name 2 objects or distances that might have each length.
a) 3 km a hiking trail
distance to a shopping mall
b) 3 m length of a room
length of a wall unit
c) 3 cm width of a ruler
width of a cellular phone
5. CHAPTER 5
5 Measuring Perimeter
Goal Estimate, measure, and compare perimeters.
1. Calculate each perimeter. Show your work. At-Home Help
a) 15 km Perimeter is the distance
around the outside of a shape.
4 cm
15 km 15 km 60 km
2 cm 2 cm
15 km
4 cm
b) This rectangle has a perimeter
of 12 cm.
25 cm 25 cm 75 cm
2 cm  4 cm  2 cm  4 cm
 12 cm
25 cm
c) 6m d) 10 cm 10 cm
4m 4m
10 cm 10 cm
20 m 50 cm
6m 10 cm
2. Draw 2 shapes each with 4 straight sides and no openings.
Measure each side to the nearest centimetre.
Label the side lengths on your drawings.
Calculate the perimeters of your shapes.
Tell which shape has the greater perimeter.
Shape 1 Shape 2
6. CHAPTER 5
6 Telling Analog Time
Goal Tell and write time using a clock with hands (analog clock).
1. Complete each time. At-Home Help
a) The shorter hand is the hour
11 12 1
10 2 hand and the longer hand is
9 3 the minute hand.
8 4
7 6 5
5 minutes after 4
b) e)
11 12 1 11 12 1
10 2 10 2
9 3 9 3
8 4 8 4
7 6 5 7 6 5
5 minutes before 7 20 minutes after 3
c) f)
11 12 1 11 12 1
10 2 10 2
9 3 9 3
8 4 8 4
7 6 5 7 6 5
10 minutes before 5 25 minutes after 1
d) g)
11 12 1 11 12 1
10 2 10 2
9 3 9 3
8 4 8 4
7 6 5 7 6 5
15 minutes after 8 20 minutes after 3
2. Write each time in 2 ways.
a) b)
11 12 1 11 12 1
10 2 10 2
9 3 9 3
8 4 8 4
7 6 5 7 6 5
30 minutes before 8 15 minutes before 9
30 minutes after 7 45 minutes after 8
7. CHAPTER 5
7 Telling Digital Time
Tell and write time using a digital clock. At-Home Help
a.m. starts at midnight.
p.m. starts at noon.
1. Match the times on the clocks to the times on
the right.
a) 25 minutes after 9 in the morning
4:00 a.m.
p.m.
b) 15 minutes after 10 at night
8:40 a.m.
p.m.
c) 12 minutes after 2 in the afternoon
a.m.
p.m.
d) 20 minutes before 9 in the evening
6:24 a.m.
p.m.
e) 24 minutes after 6 in the morning
5:30 a.m.
p.m.
f) 4 o’clock in the afternoon
a.m.
p.m.
g) 30 minutes after 5 in the morning
a.m.
p.m.
h) 10 minutes after 1 in the night
9:25 a.m.
p.m.
2. Write each time the way it would look on a digital clock.
Use a.m. or p.m.
a) 25 minutes to 10 in the morning 9:35 a.m.
b) 15 minutes after 7 at night 7:15 p.m.
c) 20 minutes to 11 in the morning 10:40 a.m.
d) 16 minutes after 4 in the afternoon 4:16 p.m.
e) noon 12:00 p.m.
8. CHAPTER 5
8 Measuring How Time Passes
Goal Estimate and measure the passage of time in minutes.
Kelly and Marco spent a summer day together. At-Home Help
Here is what they did. To figure out how long something
takes, you can think of hands
Activity Start Finish moving on an analog clock.
biked to the beach 10:30 a.m. 11:00 a.m. For example, from 9:45 a.m.
swam 11:00 a.m. 12:00 p.m. to 11:00 a.m. is 1 hour and
15 minutes.
ate lunch 12:00 p.m.
11 12 1
10 2
built a sand castle 12:45 p.m. 9 3
8 4
7 6 5
played volleyball 12:45 p.m. 1:30 p.m.
biked home 1:30 p.m.  1 hour
11 12 1
10 2
1. How long did it take Kelly and Marco to bike to 9
8 4
3
7 6 5
the beach?
30 minutes  15 minutes
11 12 1
10 2
2. How long did they swim? 9 3
8 4
7 6 5
1 hour
3. They ate lunch for 20 minutes. When did they finish?
12:20 p.m.
4. How long did they play volleyball?
45 minutes
5. Which activity took the longest time?
swimming
6. It took them 40 minutes to bike home. At what time did they get there?
2:10 p.m.
7. How long did they spend together that day?
3 hours 40 minutes
9. CHAPTER 5
9 Solve Problems Using Charts
Goal Use a chart to solve problems.
The chart at the bottom of the page shows a At-Home Help
television schedule from 6:00 p.m. to 9:00 p.m. Charts are useful tools for
Use the chart to answer these questions. organizing information.
A television schedule is a
1. How many nights is the Game Show on? 3 common type of chart.
2. How long is the Movie on Friday night? 2 hours
3. On which night is the Hockey Game? Saturday
4. How many shows are on Sunday between 6:00 p.m. and 9:00 p.m.? 3
5. Which shows are on Thursday between 6:00 p.m. and 9:00 p.m.?
News, Sports, Game Show, and Comedy Show
6. At what time do the Monday Night Music Videos start? 7:00 p.m.
7. At what time do the Monday Night Music Videos end? 9:00 p.m.
8. Make up a question about the television schedule.
For example: Which nights is the Comedy Show on?
Television Schedule for the Week
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
6:00 News News News News News News News
Hour Hour Hour
6:30 Sports Sports Sports Sports
7:00 Extinct Monday Game Game Game Movie Hockey
Animals Night Show Show Show Game
7:30 Music
Videos
8:00 Mystery Comedy Real TV Comedy
Show Show Show
8:30
10. CHAPTER 5
10 Measuring Temperature
Goal Estimate, read, and record temperature.
Match each item with the correct temperature At-Home Help
below. Write the letter above each temperature. Degree Celsius (˚C) is a unit of
What did you spell? measurement for temperature.
Some common temperatures are
1. temperature at which water freezes T 0°C 100˚C boiling water
37˚C body
2. room temperature M 22°C 7˚C inside a refrigerator
0˚C ice water
3. 30 E 10°C
20
10 8. a hot drink H 55°C
0
9. R -20°C
10 10
°C 0
10
4. a cold winter day E -10°C 20
30
5. body temperature R 37°C °C
6. temperature at which
water boils T 100°C 10. a hot summer day M 30°C
7. °C
O 85°C 11. E 40C°
60
100
50
90
40
80
30
70
20
60
T H E R M O M E T E R
100˚C 55˚C 40˚C 37˚C 30˚C 85˚C 22˚C 10˚C 0˚C 10˚C 20˚C
11. CHAPTER 5
Test Yourself
1. Use a centimetre ruler to measure this drinking straw.
A. 10 cm B. 12 cm C. 15 cm D. 18 cm
2. Which item could have a length of about 2 m?
E. a computer G. a computer mouse
F. a computer desk H. a computer mouse pad
3. Which set of items could have a length of about 1 km?
A. 100 children holding hands C. 100 paper clips
B. 1000 children holding hands D. 1000 paper clips
4. A flower stem could be about 30 long.
E. centimetres F. metres G. kilometres
5. What is the perimeter of this shape? 6m 6m
A. 19 m C. 27 m 8m 8m
B. 28 m D. 33 m 5m
6. What time is shown?
11 12 1
10 2
E. 6:20 G. 4:30 9 3
8 4
F. 4:03 H. 6:40 7 6 5
7. What time is shown?
A. 20 minutes after 10 in the morning
a.m.
p.m.
B. 20 minutes before 10 in the morning
C. 20 minutes after 10 at night
D. 20 minutes before 10 at night
8. Which temperature is a comfortable room temperature?
E. 31˚C F. 21˚C G. 12˚C H. 1˚C