







The difference between the ares of two rectangles 
20160609 

Ingrid pose la question : I am trying to help my son with an area question.
I have the answer, from the solutions, but I cannot figure out how to teach him.
Question:
Two rectangles have lengths 13cm and 19cm respectively.
Their total area is 376cm squared.
If both their widths are whole numbers, what is the difference in their areas?
I know that this is solvable once I determine the widths of the rectangles ,
but how do I go about finding that?
Thanks for your help Chris Fisher and Harley Weston lui répond. 





A procedure for finding a square root 
20150827 

Tracey pose la question : Is there a method/process to determine the square root of a large number?
For example, Tiananmen Square's area is 396 900m sq., what is the side length?
Thank you,
Tracey Harley Weston lui répond. 





Express the HCF of 1232 and 573 as 1232x + 573y = 1 
20090222 

Anonymous pose la question : Express the HCF of 1232and 573 as 1232x + 573y = 1. Victoria West lui répond. 





Discovering the incircle of an irregular polygon 
20070525 

Joaquim pose la question : I've been searching in some books and many websites, but I couldn't find a formula or algorithm for discovering the incircle of an irregular polygon, could you please help me? Walter Whiteley lui répond. 





Greatest common divisor 
20070314 

Marie pose la question : How do I prove this?
Let h be the greatest common divisor of the positive integers a and b.
Show that there exist integers p and q (not necessarily positive) such that
pa + qb = h.
Thanks Penny Nom lui répond. 





Show that 3k+2 and 5k+3 are relatively prime 
20070115 

Andrea pose la question : show that if k is a positive integer, then 3k+2 and 5k+3 are relatively prime Penny Nom lui répond. 





How many children were there? 
20060514 

Geecee pose la question : At a local village gala, the entire population turned up, 500 people. The event raised £3,000. Tickets were priced as follows: £7.48 men, £7.12 women and £0.45 children.
How many children were there? Stephen La Rocque lui répond. 





Finding square roots 
20060412 

Fehmida pose la question : I would like to know about tricks or formulas to do complicated square roots.
ex. square root of 1029 Penny Nom and Steve La Rocque lui répond. 





The Euclidean Algorithm 
20020131 

Murray pose la question : Can you please explain to me why the euclidean algorithm works? Penny Nom lui répond. 





Reduce 79,537/3,623,420 
20011213 

Eliana pose la question : How do you reduce 79,537/3,623,420. Claude Tardif lui répond. 





A calculation with 6 numbers 
20010616 

Edwin pose la question : I'm asked to come with, and program (in Ansi C) an algorithm that calculates all the possible results of a calculation with 6 numbers and one result. For example: I want all calculations with the numbers 3, 3, 8, 8, 2, 9, and with a result of 786. all numbers may be used once, arithmetical operations allowed are +  / *, fractions are not allowed. The problem here is what is a fast method to do this (i.e. what's algorithm that can to this). Claude Tardif lui répond. 





Why does division start from the left? 
20000524 

Salil Dave pose la question : Addition, subtraction and multiplications start with right most digit and proceed left, but division starts from leftmost digits and goes right ... why? Harley Weston lui répond. 





Algorithms for roots 
19960222 

Charles Hewitt pose la question : I have seen an algorithm for finding the square root of numbers. Are there similar such algorithms for higher roots? Harley Weston lui répond. 





Prime numbers 
19960222 

Charles Hewitt pose la question : I would apprecaite it if you could share with me any algorithm to determine whether a number is prime. Penny Nom lui répond. 

