First, the relationship between unit price, quantity and total price
1.
lead into/introduce
There are various quantitative relations in production and life.
.
What are the common quantitative relations in multiplication application problems?
.
2.
example
1
: unit price × quantity
=
total
( 1)
example
1.
Every pencil
five
Jiao, buy
three
Branch usage:
5×3= 15 (angle
)
15
corner
= 1
Yuan dynasty (1206- 1368)
five
corner
Basketball players
70
Yuan, buy
2
Personal use:
70×2= 140 (yuan
)
Fish per kilogram
nine
Yuan, buy
four
Kilogram:
9×4=36 (yuan
)
(2)
Guide the students to make it clear that the above three questions are all about buying things with money.
.
The price of each commodity is called the unit price.
How much did you buy?
What is the total price?
.
The unit price in the first question is
five
Angle, quantity is
three
Branch, the total price is
1
Yuan dynasty (1206- 1368)
five
corner
.
The unit price in the second question is
70
Yuan, the quantity is
2
1. The total price is
140
Yuan dynasty (1206- 1368)
.
The unit price in the third question is
nine
Yuan, the quantity is
four
Kilogram, the total price is
36
Yuan dynasty (1206- 1368)
.
for instance
1
As you can see, the relationship between unit price, quantity and total price is:
Unit price × quantity
=
total
Second, speed.
Travel distance
The relationship between time
example
1
Every branch of the car
750
Rice,
four
How long is this branch?
750
×
4=3000(
rice
)
2
Xiao Qiang walks every minute.
66
Rice,
five
How many meters does it take to walk?
66
×
5=330(
rice
)
three
A ship sails every hour.
18
Kilometers,
three
How many kilometers per hour?
18
×
3=54(
kilometre (km)
)
four
The train runs every hour.
120
Kilometers,
2
How many kilometers per hour?
120
×
2=240(
kilometre (km)
)
The above four questions are completed by the students independently, and then the students dictate the process of solving the problems, and the teacher writes on the blackboard.
The teacher instructed the students to observe the above four small problems. What are they talking about? What are their characteristics?
(
The four little questions are all about the same kind of things, all about driving and walking. The characteristic is that the known condition is to walk every minute and every hour.
How many roads, the question is how many roads to take.
)
According to the students' answers,
To sum it up.
The known condition of each of the above questions is every point.
The distance traveled per hour,
We call it.
Speed.
Please summarize what speed is in one sentence.
(
The distance between every minute and every hour is called speed.
)
The teacher definitely added that according to the actual speed of an object, it can be divided into seconds, minutes, hours, days, weeks, months and years.
The distance traveled per unit time is called speed.
(
You can also ask students to give some examples from daily life.
Explain what speed is.
)
Q: So in the title.
four
Points,
five
Points,
three
When,
2
When is it called?
(
The answer is time.
)(
Write on the blackboard.
)
Ask again:
The result of our calculation.
(
That is, the problem in the title
)3000
m，
330
m，
54
Kilometers,
240
Km representative
What is this?
(
The answer is * * * distance.
)
The teacher concluded:
We call a road a distance.
As can be seen from the title, both speed and distance are measured in meters.
Kilometers and other different lengths
Degree unit. Think about the difference between speed and distance. What do you mean?
Speed: the distance traveled by experts in unit time.
Distance: A road traveled by * *.
According to the above four formulas,
Point out the speed,
Time,
The relationship between three distance quantities.
And guide students.
abstract
unlink
Type:
Speed × time
=
Distance.
Tell me about the speed of each question.
What time is it now,
What is the distance?
Then according to the speed × time
=
The relationship between three quantities of distance,
Make up an application question and say what the speed, time and distance are.