Year 5 Angles: compare, name, estimate and measure angles worksheet

“Finding square corners” is free to print, with no account. It is the first sheet in the Year 5 maths unit “Angles: compare, name, estimate and measure angles”, for children aged 9 to 10, and takes about 20 minutes.

Print it on A4. The child's pages come first; the answers, and what each wrong answer tells you, are on the grown-up page that follows. Weeks 34 to 36 of the year, 15 sheets in the unit.

Free sample · answers on the last page

Finding square corners

Name: ____________ · Date: ____________
Year 5 · Maths · about 20 minutes
Answers are on the grown-up page

Today I can recognise a right angle as a square corner, however it is turned or tilted.

A Look back3 min

1.
How many counters are in this array?
2.
What fraction of this rectangle is shaded? Circle one.
1/41/23/4
3.
A circle is cut into quarters. How many quarters make a half?

B Watch me, then you4 min

Ola folds a sheet of paper twice. She presses the folded corner onto a rectangle to test it.

Watch me

Fold a sheet twice and press the folded corner into each corner.

Each corner fits exactly, so each one is a right angle.

A rectangle has 4 right angles.

Now you

1.
A square has right angles.

C Your turn6 min

Each clock shows the hour hand turning clockwise from 12. One quarter turn is one right angle.

1.
The hour hand turns from 12 to 3. How many right angles is that turn?
2.
The hour hand turns from 12 to 6. How many right angles is that turn?
3.
The hour hand turns from 12 to 9. How many right angles is that turn?
4.
The hour hand goes all the way round and back to 12. How many right angles?

Say it out loud: What changes each time, and what stays the same?

D Spot the mistake3 min

A closed book lying on a desk, turned at a slant so its square corner points sideways

Sam says: “A corner is only a right angle if one line goes straight up and the other goes straight across.”

1.
Is Sam right? Explain in one sentence.

E Think deeper4 min

A triangular set square lying flat on a drawing board with one square corner

1.
Kit says a triangle can have two right angles. Is Kit right? Explain how you know.

How did it feel?

I can do it Nearly Not yet

For the grown-up

Finding square corners · 2 minutes to read

Answers, and what a wrong one tells you

A

1. 36

2. 1/4

3. 2

B

1. 4 If your child writes 2, they may have tested only the top corners. Test all four corners with the folded paper.

C

1. 1 If your child writes 3, they counted each hour from 12 to 3 (1 + 1 + 1). A quarter turn is one right angle, and 12 to 3 is one quarter.

2. 2

3. 3

4. 4

D

1. Look for: says no; a right angle is a square corner however it is turned or tilted If your child agrees with Sam, ask them to fold a paper corner and press it onto the tilted corner. Does it fit?

E

1. Look for: says no, because two right angles leave no room for the third corner of a triangle If your child says yes, ask them to draw two square corners on one triangle and check where the third corner can go.

Words to use

Say“Which corners fit the folded paper? Check the tilted ones too.”

Instead of“A corner only counts as a right angle when its lines go straight up and across.”

After the sheet

Fold a sheet of paper twice and test the corners of books, tiles and the table at home.

Tick what your child got right in StudyDen. Anything missed comes back in a later Look back box, so there's no need to redo the sheet.

The rest of this unit

14 more sheets come with a StudyDen plan, in teaching order:

Turns and angles(with a plan)
Acute, obtuse and reflex(with a plan)
Measuring turns in degrees(with a plan)
Angles Against Benchmarks(with a plan)
Turning in Degrees(with a plan)
Estimating acute and obtuse angles(with a plan)
Full turns and 360 degrees(with a plan)
Angles at a point(with a plan)
Angles in quadrilaterals(with a plan)
Angles on a straight line(with a plan)
Angles in triangles(with a plan)
Measuring angles with a protractor(with a plan)
Drawing Angles Accurately(with a plan)
Angle sums in polygons(with a plan)

Every Year 5 maths worksheet

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