Square numbers

problem

Digat

Age

11 to 14

Challenge level

What is the value of the digit A in the sum below: [3(230 + A)]^2 = 49280A
problem

Triangular Triples

Age

14 to 16

Challenge level

Show that 8778, 10296 and 13530 are three triangular numbers and that they form a Pythagorean triple.
problem

Triangles Within Squares

Age

14 to 16

Challenge level

Can you find a rule which relates triangular numbers to square numbers?
problem

Relative Powers

Age

14 to 16

Challenge level

The square of a number is 12 more than the number itself. The cube of the number is 9 times the number. What is the number?
problem

Square Sum

Age

14 to 16

Challenge level

One of these numbers is the largest of nine consecutive positive integers whose sum is a perfect square. Which one is it?
problem

No Square Sums

Age

14 to 16

Challenge level

How many numbers do you need to remove to avoid making a perfect square?
problem

Square Triangle

Age

11 to 14

Challenge level

How many triangles have all three angles perfect squares (in degrees)?
problem

Square Routes

Age

11 to 14

Challenge level

How many four digit square numbers are composed of even numerals? What four digit square numbers can be reversed and become the square of another number?
problem

Little Squares

Age

5 to 7

Challenge level

Look at the squares in this problem. What does the next square look like? I draw a square with 81 little squares inside it. How long and how wide is my square?
problem

Numbers as Shapes

Age

5 to 7

Challenge level

Use cubes to continue making the numbers from 7 to 20. Are they sticks, rectangles or squares?