1. Calculate the following question and talk about how fractional multiplication is calculated.

8/ 15 × 5 × 24 × 3/8, 7/ 18 × 9/ 14

The boy said: it is easier to make an appointment first and then calculate whether it can be made.

The girl said: fraction × fraction, numerator multiplied by numerator, denominator. .....

2. How to easily calculate the following questions?

One third × five sixteenth × three fifths

( 1/5+2/3) × 15

4/7× 5/9+3/7× 9/7.

The elf said, "What arithmetic law do you use?"

3.( 1) The fat stored in the camel hump (the fourth sound of Zhu) is equivalent to one fifth of the body weight. A camel weighing 225 kilograms. How much fat is there in the hump?

(2) The average annual sunshine in Guangzhou is 1.608 hours, and the annual sunshine time in Beijing is half that in Guangzhou. How many hours of sunshine are there in Beijing a year?

The elf said, "how did you solve the above problem?" Tell me what you think.

4. Think about what is reciprocal first, and then write the reciprocal of the following numbers.

Five Sixths

seven

Nine quarters

five eighths

1

one third

Exercise 7

1. Calculate the following problem.

Three fifths ×50

Five sevenths+one third

One seventh × two thirds

2/9× 18

Three quarters-one eighth

Two-nineths ×4

Four fifths × five eighths

Four fifths × one eighth

2. Among invertebrates, squid swims fastest, and its speed is 9/ 10 km/min. How many kilometers can it swim in 30 minutes? 1 hour?

3. Every hectare of Cryptomeria fortunei forest can absorb 18 tons of sulfur dioxide every year. How many tons of sulfur dioxide can a six-hectare Cryptomeria fortunei forest absorb each year?

4. Use a simple algorithm to calculate the following questions.

5/ 18 × 1/4× 9/ 10

(one quarter+two ninth) ×36

Seven tenths × three eighths× four ninetieth

There are 20 poplars in the campus, among which willow is nine-tenths of poplar and three-thirds of locust. How many locust trees are there?

6.( 1) Students from three classes in Grade Six help the library to make up books. Class one made up 54 copies, and Class two made up five-sixths of Class one. How many copies did Class Two make up?

(2) The repairs in Class Three are one fifth less than those in Class Two. How many copies did Class Three make up?

7. Say the reciprocal of the following numbers.

ninth

Fifty-one out of sixty-two

five

Three-twelfth

102

Sixteenth of seventeen

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