2 out of 3
Can you show this algebraic expression is divisible by 4?
2 out of 3
The square of a positive number is twice as big as the cube of that number. What is the number?
1 out of 3
What number could replace x so that x/5 is between 3 and 4?
1 out of 3
What size square should you cut out of each corner of a 10 × 10 grid to make the box that would hold the greatest number of cubes?
2 out of 3
All the girls would like a puzzle each for Christmas and all the boys would like a book each. Solve the riddle to find out how many puzzles and books Santa left.
3 out of 3
Evaluate without a calculator: (5 sqrt2 + 7)^{1/3} - (5 sqrt2 - 7)^1/3}.
2 out of 3
Can you put the 25 coloured tiles into the 5 × 5 square so that no column, no row and no diagonal line have tiles of the same colour in them?
3 out of 3
A 2-digit number is squared. When this 2-digit number is reversed and squared, the difference between the squares is also a square. What is the 2-digit number?
