The value of the circle changes in each of the following problems. Can you discover its value in each problem?
Amy's mum gave her £2.50 to spend. She bought four times as many pens as pencils and was given 40p change. How many of each did she buy?
Can you replace the letters with numbers? Is there only one solution in each case?
Find out what a Deca Tree is and then work out how many leaves there will be after the woodcutter has cut off a trunk, a branch, a twig and a leaf.
Imagine a wheel with different markings painted on it at regular intervals. Can you predict the colour of the 18th mark? The 100th mark?
Think of a number, square it and subtract your starting number. Is the number you're left with odd or even? How do the images help to explain this?
