Other tags that relate to Surds
Other equations. Working systematically. Creating and manipulating expressions and formulae. Simultaneous equations. Surds. Selecting and using information. Graphs. Generalising. Diophantine equations. Integers.There are 15 results
Broad Topics > Algebraic expressions, equations and formulae > Diophantine equations
Letter Land
Age 11 to 14 Challenge Level:
If: A + C = A; F x D = F; B - G = G; A + H = E; B / H = G; E - G = F and A-H represent the numbers from 0 to 7 Find the values of A, B, C, D, E, F and H.
CD Heaven
Age 14 to 16 Challenge Level:
All CD Heaven stores were given the same number of a popular CD to sell for £24. In their two week sale each store reduces the price of the CD by 25% ... How many CDs did the store sell at. . . .
Rudolff's Problem
Age 14 to 16 Challenge Level:
A group of 20 people pay a total of £20 to see an exhibition. The admission price is £3 for men, £2 for women and 50p for children. How many men, women and children are there in the group?
Coffee
Age 14 to 16 Challenge Level:
To make 11 kilograms of this blend of coffee costs £15 per kilogram. The blend uses more Brazilian, Kenyan and Mocha coffee... How many kilograms of each type of coffee are used?
Whole Numbers Only
Age 11 to 14 Challenge Level:
Can you work out how many of each kind of pencil this student bought?
Not a Polite Question
Age 11 to 14 Challenge Level:
When asked how old she was, the teacher replied: My age in years is not prime but odd and when reversed and added to my age you have a perfect square...
Our Ages
Age 14 to 16 Challenge Level:
I am exactly n times my daughter's age. In m years I shall be ... How old am I?
Hallway Borders
Age 11 to 14 Challenge Level:
What are the possible dimensions of a rectangular hallway if the number of tiles around the perimeter is exactly half the total number of tiles?
In Particular
Age 14 to 16 Challenge Level:
Can you find formulas giving all the solutions to 7x + 11y = 100 where x and y are integers?
Fibs
Age 11 to 14 Challenge Level:
The well known Fibonacci sequence is 1 ,1, 2, 3, 5, 8, 13, 21.... How many Fibonacci sequences can you find containing the number 196 as one of the terms?
Deep Roots
Age 14 to 16 Challenge Level:
Find integer solutions to: $\sqrt{a+b\sqrt{x}} + \sqrt{c+d.\sqrt{x}}=1$
Plutarch's Boxes
Age 11 to 14 Challenge Level:
According to Plutarch, the Greeks found all the rectangles with integer sides, whose areas are equal to their perimeters. Can you find them? What rectangular boxes, with integer sides, have. . . .
Are You Kidding
Age 14 to 16 Challenge Level:
If the altitude of an isosceles triangle is 8 units and the perimeter of the triangle is 32 units.... What is the area of the triangle?
Upsetting Pitagoras
Age 14 to 18 Challenge Level:
Find the smallest integer solution to the equation 1/x^2 + 1/y^2 = 1/z^2
Solving with Euclid's Algorithm
Age 14 to 18 Challenge Level:
A java applet that takes you through the steps needed to solve a Diophantine equation of the form Px+Qy=1 using Euclid's algorithm.
NRICH is part of the family of activities in the Millennium Mathematics Project.