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Math Grade 4Mrs. Ennis
Standard Units of Measurement
Lesson Thirty-One
1. What is the sum of 250, 3, and 3,459?
2. 26,459 – 19,878 = G
3. Find the product of 8, 6, and 0.
4. J x 600 = 5400
5. 36 divided by 6
6. One half of 12
7. It is 3:00 now. What time was it 40 minutes ago?
8. Round 63,596 to the nearest thousand
9. The basketball game started at 11:00a.m. It lasted for 3 hours and 45 minutes. What time did it finish?
10. Zachary earns $5.00 per hour for working at the pet store. If he works five and a half hours, how much will he earn?
Conversions Using Standard Units of Measurement
Measurement
You are making a measurement when you
¨ Check you weight
¨ Read your watch
¨ Take your temperature
¨ Weigh a cantaloupe
Standards of Measurement
When we measure, we use a measuring tool to compare some dimension of an object to a standard.
Some Tools for Measurement
Measuring Time
Minutes:
3 Units of Measurement for Time:
Seconds:
there are 60 seconds in a minute
Hours:
there are 3600 Seconds in one hour
there are 60 minutes in an hour
there are 24 hours in an day
So how would we find out how many minutes are in 3 hours?
We would convert the hours to minutes.
3 x 60hours
minutes in each hour
= 180
minutes in 3 hours
In any conversion, when going from a smaller unit to a larger unit, always divide.
When going from a larger unit to a smaller unit, always multiply.
So how would we find out how many minutes are in 540 seconds?We would convert the seconds to minutes.
540 ÷ 60second
s seconds in each minute
= 9
minutes in 540 seconds
So how would we find out how many seconds are in a half hour?We would convert the minutes to seconds.
30 x 60minutes in a half hour
seconds in each minute
= 1800
seconds in a half hour
So how would we find out how many hours are in 660 minutes?We would convert the minutes to hours.
660 ÷ 60minute
s minutes in each hour
= 11
hours in 660 minutes
So how would we find out how many seconds are in 2 hours?
First we would convert the hours to minutes.
2 x 60hours
minutes in each hour
= 120
minutes in 2 hours
How many seconds are in 2 hours?
Then we would convert the minutes to seconds.
120 x 60minutes
seconds in each minute
= 7200
minutes in 2 hours
You try some:
300 minutes = _______ hours
7 hours = _______ minutes
40 minutes = _______ seconds
240 seconds = _______ minutes
5 hours = _______ seconds
5420 240
0 418000
Measuring Length
Feet:
3 Units of Measurement for Length:
Inches:there are 12 inches in a foot
Yards:
there are 36 inches in a yard
there are 3 feet in a yard
= 3 feet
How long is an inch?
A quarteris aboutan inch
wide 1 inch
How long is a foot?
About thelength of
a clipboard
1 foot
How long is a yard?
About thewidth ofa door
1 yard
In any conversion, when going from a smaller unit to a larger unit, always divide.
When going from a larger unit to a smaller unit, always multiply.
So how would we find out how many feet are in a 8 yards?
We would convert the yards to feet.3 x 8
Feet in one yard yards
= 24 ft
Feet in 8 yards
So how would we find out how many inches are in 6 feet?
We would convert the feet to inches.12 x 6
inches in one foot feet
= 72 in
inches in 6 feet
How many yards are in 27 feet?
We would convert the feet to yards.
27 ÷ 3feet
feet in each yard
= 9 yd
yards in 27 feet
How many inches are in 10 yards?
First we would convert the yards to feet.
10 x 3yards
feet in each yard
= 30 ft
feet in 10 yards
How many inches are in 10 yards?
Then we would convert the feet to inches.
30 x 12feet
inches in each foot
= 360 in
inches in 10 yards
36 feet = _______ yd
4 yd = _______ ft
60 in = _______ ft
120 ft = _______ yd
12 ft = _______ in
7 yd = _______ ft
Try these on your own:
4812
540
14484
Measuring Weight
Pounds:
3 Units of Measurement for Weight:
Ounces:
there are 16 ounces in a pound
Tons:
there are 2000 pounds in a ton
= 2000 pounds
In any conversion, when going from a smaller unit to a larger unit, always divide.
When going from a larger unit to a smaller unit, always multiply.
How many ounces are in 3 pounds?
We would convert the pounds to ounces.
3 x 16pounds ounces in
a pound
= 48
ounces in 3 lbs
How many pounds are in 160 ounces?
We would convert the ounces to pounds.
160 ÷ 16ounces
ounces in a pound
= 10
pounds in 160 oz
How many pounds are in 6 tons?
We would convert the tons to pounds.
6 x 2000tonspounds in a ton
= 12000pounds in 6 tons
How many ounces are in 2 tons?
First, we would convert the tons to pounds.2 x 2000tonspounds in a ton
= 4000pounds in 2 tons
How many ounces are in 2 tons?
Then, we would convert the pounds to ounces.4000 x
16pounds ounces in
a pound
= 64000ounces in 2 tons
32 oz = _______ lb
4 lb = _______ oz
5 tons = _______ lb
120 ft = _______ yd
12 ft = _______ in
7 yd = _______ ft
Try these on your own:
642
1000040
14484
Online Practice
Ounces and Pounds
Animal Weigh In
Inches to Feet
Hours and Minutes
Math Fun:Kim's uncle sends her a box of books each month. A box with 2 books costs 95 cents to mail; a box with 5 books costs $1.85. A box with 1 book costs 65 cents, one with 4 books costs $1.55; and a box of 3 books cost $1.25. How much did it cost him to mail a box of 6 books? How much would it have cost him to mail all 52 books at once?
Answer:
Each extra book cost 30 cents more. So six books cost $1.85 (for 5 books) + $0.30, or $2.15. All 52 books at once would have cost 65 cents for the first book and 51 x $0.30, or $15.30 for the rest. $15.30 +$0.65 = $15.95 for all 52 books.
http://mathlearnnc.sharpschool.com/UserFiles/Servers/Server_4507209/File/Instructional%20Resources/G4WW1-4.pdf
Resources:
http://math.pppst.com/measurement.html
http://www.bbc.co.uk/education/mathsfile/shockwave/games/animal.html
http://www.aaastudy.com/mea6_hx1.htm
http://www.sheppardsoftware.com/mathgames/measurement/MeasurementOunces.htm
http://www.sheppardsoftware.com/mathgames/measurement/MeasurementInches.htm