Chapters
- Exercise 1
- Exercise 2
- Exercise 3
- Exercise 4
- Exercise 5
- Exercise 6
- Exercise 7
- Exercise 8
- Exercise 9
- Exercise 10
- Exercise 11
- Solution of exercise 1
- Solution of exercise 2
- Solution of exercise 3
- Solution of exercise 4
- Solution of exercise 5
- Solution of exercise 6
- Solution of exercise 7
- Solution of exercise 8
- Solution of exercise 9
- Solution of exercise 10
- Solution of exercise 11
Exercise 1
Given the numbers 
, 
, and 
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 
, and the divisor 
. What is the dividend?
Exercise 3
The quotient division is 
, the divisor, 
, and the dividend, 
. What is the remainder?
Exercise 4
Peter bought a farm for 
dollars and after selling it he made a profit of 
dollars. How much did he sell it for?
Exercise 5
With the money that I have now and 
dollars more, I could pay a debt of 
dollars and I would still have 
dollars. How much money I have?
Exercise 6
We want to buy 
Kg of sardines at a rate of 
dollars per Kg. If postage cost 
dollars and I want to earn 
dollars from the sale, how much should each kilogram of sardines be sold for?
Exercise 7
How many years are in 
days? Consider that a year has 
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 
liters of water. How long does it take to be filled by a hose that can distribute liters per minute?
Exercise 10
An airport has a plane landing every 
minutes. How many planes land in one day?
Exercise 11
In a residential complex, there are 
inhabitants, and there is a tree for every 
inhabitants. How many trees are there in the complex? How many trees will have to be planted to have a tree for every 
people?
Solution of exercise 1
Given the numbers , , and form all possible numbers of three different figures, arrange them from low to high and add them.
Solution of exercise 2
The quotient of an exact division is , and the divisor . What is the dividend?
Solution of exercise 3
The quotient division is , the divisor, , and the dividend, . What is the remainder?
Solution of exercise 4
Peter bought a farm for dollars and after selling it he made a profit of dollars. How much did he sell it for?
dollars
Solution of exercise 5
With the money that I have now and dollars more, I could pay a debt of dollars and I would still have dollars. How much money I have?
dollars
Solution of exercise 6
We want to buy Kg of sardines at a rate of dollars per Kg. If postage cost dollars and I want to earn dollars from the sale, how much should each kilogram of sardines be sold for?
dollars
Solution of exercise 7
How many years are in days? Consider that a year has days.
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.
selections
Solution of exercise 9
A pool contains liters of water. How long does it take to be filled by a hose that can distribute liters per minute?
minutes
hours
Solution of exercise 10
An airport has a plane landing every minutes. How many planes land in one day?
minutes per day
planes to the day
Solution of exercise 11
In a residential complex, there are inhabitants, and there is a tree for every inhabitants. How many trees are there in the complex? How many trees will have to be planted to have a tree for every people?
trees in the residential complex.
trees total, if every inhabitants have a tree.
trees
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I’m afraid this article (on cardinal numbers) has an unfortunate error. Zero must be considered a cardinal number. The definition of a cardinal number given by the Penguin Dictionary of Mathematics is “A number that indicates the number of elements in a set.” It also defines a null set or empty set containing no elements. The cardinality of this set is 0.