The best Maths tutors available
Exercise 1

Exercise 2

Exercise 3

Exercise 4

Exercise 5

Solution of exercise 1
Calculate the square root of:



Solution of exercise 2
Calculate the square root of:


Solution of exercise 3
Calculate the square root of:


Solution of exercise 4
Calculate the square root of:


Solution of exercise 5
Calculate the square root of:


Summarise with AI:









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.