Angles on a straight line Core Maze

This is a maze activity where children should identify angles on a straight line and half a turn (total 180°).

Children should recognise that a half turn is the same as a

straight line, meaning that adjacent angles on a straight line

sum to 180°. Looking at a protractor will reinforce this point,

as children will see that the 0° to 180° line is a straight line.

Once children are secure in the understanding that both a

half turn and a straight line are equal to 180°, they move on

to working out unknown angles on a straight line.

The whole (180°) subtract each part; or add the parts first, then subtract

from the whole.

Ask:

What strategies can you use to work out missing angles?

Do you need to add or subtract to find the unknown angle?

Why?

If there is more than one missing angle but they are equal,

how can division help you to work them out

Answer sheets attached