Guess first, then measure with your ruler. How close was your guess?

Challenge: draw a line exactly 7.5 cm long. Ask someone to check it.

Tip: start at the 0 mark, not at the end of the ruler.

Put the centre hole of the protractor on the corner, the 0 line along one side, then turn the arm to the other side and read the angle.

Hunt at home: the corner of a book · clock hands at 3 o'clock · clock hands at 2 o'clock · scissors opened a little · a door opened halfway.

Hold the pivot still (or use a drawing pin), put your pencil tip in the hole for the size you want, and turn slowly.

1. Draw circles with a radius of 3, 5 and 8 cm – all with the same centre.
2. Flower: draw one circle (radius 4 cm). Put the pivot anywhere on that circle and draw the same circle again. Move the pivot to where the two circles cross and repeat, all the way round. You get six petals!

Radius = from the centre to the edge. Diameter = right across = 2 × radius.

1. Parallel lines: lay the ruler down, put a set square against it and draw along the square's edge. Slide the square along the ruler and draw again. The lines never meet!
2. Draw a square with sides of 6 cm using a set square for the corners.
3. Measure the three corners of each set square with your protractor. What do the three angles add up to?
4. Use the stencil holes to draw a robot, a house or a face.