Exercise 1

Given the numbers 5, 7, and 9 form all possible numbers of three different figures, arrange them from low to high and add them.

Exercise 2

The quotient of an exact division is 504, and the divisor 605. What is the dividend?

Exercise 3

The quotient division is 21, the divisor, 15, and the dividend, 321. What is the remainder?

Exercise 4

Peter bought a farm for 643,750 dollars and after selling it he made a profit of 75,250 dollars. How much did he sell it for?

Exercise 5

With the money that I have now and 247 dollars more, I could pay a debt of 525 dollars and I would still have 37 dollars. How much money I have?

Exercise 6

We want to buy 1,600 Kg of sardines at a rate of 4 dollars per Kg. If postage cost 400 dollars and I want to earn 1,200 dollars from the sale, how much should each kilogram of sardines be sold for?

Exercise 7

How many years are in 6,205 days? Consider that a year has 365 days.

Exercise 8

Peter wants to buy a car. The store will offer two models: a two-door and a four-door. In both models, the available colors are: white, blue, red, gray, and green. Calculate the number of possible selections that Peter has.

Exercise 9

A pool contains 45,000 liters of water. How long does it take to be filled by a hose that can distribute 15 liters per minute?

Exercise 10

An airport has a plane landing every 10 minutes. How many planes land in one day?

Exercise 11

In a residential complex, there are 4,500 inhabitants, and there is a tree for every 90 inhabitants. How many trees are there in the complex? How many trees will have to be planted to have a tree for every 12 people?

 

Solution of exercise 1

Given the numbers 5, 7, and 9 form all possible numbers of three different figures, arrange them from low to high and add them.

579 + 597 + 759 + 795 + 957 + 975 = 4662

 

Solution of exercise 2

The quotient of an exact division is 504, and the divisor 605. What is the dividend?

504 \times 605 = 304,920

 

Solution of exercise 3

The quotient division is 21, the divisor, 15, and the dividend, 321. What is the remainder?

321 − 21 \times 15 = 321 - 315 = 6

 

Solution of exercise 4

Peter bought a farm for 643,750 dollars and after selling it he made a profit of 75,250 dollars. How much did he sell it for?

643,750 + 75,250 = 719,000 dollars

 

Solution of exercise 5

With the money that I have now and 247 dollars more, I could pay a debt of 525 dollars and I would still have 37 dollars. How much money I have?

525 + 37 = 562

562 - 247 =315 dollars

 

Solution of exercise 6

We want to buy 1,600 Kg of sardines at a rate of 4 dollars per Kg. If postage cost 400 dollars and I want to earn 1,200 dollars from the sale, how much should each kilogram of sardines be sold for?
1,600 \times 4 = 6400

6,400 + 400 + 1200 = 8,000

8,000 \div 1,600 =5 dollars

 

Solution of exercise 7

How many years are in 6,205 days? Consider that a year has 365 days.
6,205 \div 365 = 17 years

 

Solution of exercise 8

Peter wants to buy a car. The store will offer two models: a two-door and a four-door. In both models, the available colors are: white, blue, red, gray, and green. Calculate the number of possible selections that Peter has.
2 \times 5 = 10 selections

 

Solution of exercise 9

A pool contains 45,000 liters of water. How long does it take to be filled by a hose that can distribute 15 liters per minute?
45 000 \div 15 = 3 000 minutes

3 000 \div 60 = 50 hours

 

Solution of exercise 10

An airport has a plane landing every 10 minutes. How many planes land in one day?

24 \times 60 = 1 440 minutes per day

1 440 \div 10 = 144 planes to the day

 

Solution of exercise 11

In a residential complex, there are 4,500 inhabitants, and there is a tree for every 90 inhabitants. How many trees are there in the complex? How many trees will have to be planted to have a tree for every 12 people?

4,500 \div 90 = 5 trees in the residential complex.

4,500 \div 12 = 375 trees total, if every 12 inhabitants have a tree.

375 − 50 = 325 trees

 

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Emma

I am passionate about travelling and currently live and work in Paris. I like to spend my time reading, gardening, running, learning languages and exploring new places.