Primary 5 Mathematics

Solution: (1) According to the steel pipe is 3 meters long and weighs 4 kilograms, it gets:

4 kg 3 m = 4 3 kg m, so such a steel pipe weighs 4 3 kg per meter.

2) According to the steel pipe is 3 meters long and weighs 4 kg, get:

3 m 4 kg = 3 m 4 kg.

So 1 kg of such a steel pipe is 3, 4 meters long.

1) How many kilograms does such a steel pipe weigh per meter?

3 meters and weighs 4 kilograms, so each meter weighs 4 3, which is approximately equal to kilograms.

2) How many meters is 1 kg of such a steel pipe long? How?

Each meter weighs 4 3 kg, so 1 kg includes as many 4 3 kg, how many meters are long, so length: 1 (4 3) = 3 4 = meters.

1.Each meter = 4 3 kg A total of 3 meters The component of one meter is the total weight of 1 3.

2.Each kilogram = 3 4 meters A total of 4 kilograms The length of each kilogram is the total length of the meters.

1) How many kilograms does such a steel pipe weigh per meter?

4 3 = 4 3 kg.

2) How many meters is 1 kg of such a steel pipe long?

3 4 = 3 4 meters.

How?

How many kilograms per meter, that is, divide the total weight into 3 equal parts, take one portion.

How many meters per kilogram, that is, divide the total length into 4 equal parts, take one portion.

1.Weight per meter: 4 3

Kilogram length: 3 4

Find the weight per meter: the total number of meters is the number of parts, do the divisor, find the weight per kilogram: the total kilogram is the number of parts, do the divisor.

Divide by 3 to find the unit quantity "meters", of course, "kilograms divided by meters".

Divide by 4 and the same as above.

15 vehicles with 14 data, 1 data less;

1) Complete the statistical table below based on the above data.

Fuel consumption (liters) 12 13 14 15 16

Number of vehicles 1 1 1 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

2) Which data represents the fuel consumption of this model?

Mode: 13 liters, 3) The fuel consumption of a general small displacement car is 5 liters per 100 kilometers, in comparison, what do you think of the fuel consumption of the above model car?

13 = 5 2 + 3, this type of car consumes too much fuel;

The average of this set of data:

12+ +13+13 + 13+15+ There are only 14 sets of data here, you may have one less).

The fuel consumption of this model car is too large compared to the fuel consumption per 100 kilometers of ordinary small displacement cars.

2) Median.

3) The fuel consumption is too high.