51ºÚÁÏ

This maze activity helps children to identify angles on a straight line and half a turn (total 180°).

The second worksheet is aimed at those working at age expected. Children
work out the unknown angle on a straight line. Includes multiples of 5 and 10.

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 sheet attached