To be able to measure accurately with a protractor...

Year 5 Properties of Shape Lesson 3

thirdspacelearning.com Specialist 1-to-1 maths interventions and curriculum resources

To be able to measure accurately with a protractor (2)

Success Criteria:

Mastery:

I can measure accurately

with a protractor to the

nearest degree.

Greater Depth:

I can measure angles

accurately with a

protractor to solve a

variety of different

problems.

01/05/2020

What is an acute angle?

What is an obtuse angle?

Define each type of angle using the key words below:

- straight line

- right angle

- greater than

- less than

An obtuse angle………………………..

An acute angle………………………….

STARTER:

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Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

What is an acute angle?

What is an obtuse angle?

Define each type of angle using the key words below:

- straight line

- right angle

- greater than

- less than

An obtuse angle is greater than a right angle, but less

than a straight line.

An acute angle is less than a right angle.

STARTER:





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

How should measure this angle accurately?

TALKING TIME:

Y

X

Z





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

How should Chen measure this angle accurately?

TALKING TIME:

Y

X

Z

Chen should place the base line of

his protractor on the YZ line. He

should make sure that he reads the

correct scale.





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Read the angles measured on the protractors.

ACTIVITY 1:





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Read the angles measured on the protractors.

ACTVITY 1:

160°

130°100°





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Can you estimate the size of the angles below?.

TALKING TIME:





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Can you estimate the size of the angles below?.

TALKING TIME:

170°

100°

145°





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

ACTIVITY 2:

1. Without using a protector draw four different acute angles.

2. Estimate the size of each angle.

3. Use a protector to measure your angle accurately.

Were your estimations correct?





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

ACTIVITY 2:

1. Without using a protector draw four different acute angles.

2. Estimate the size of each angle.

3. Use a protector to measure your angle acutely.

Were your estimations correct?

Make sure:

- you start at 0°

- you read the

correct scale.





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Take a look at the shape below. How many obtuse angles can

you count? How many acute angles?

TALKING TIME:





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Take a look at the shape below. How many obtuse angles can

you count? How many acute angles?

TALKING TIME:

These are 5 obtuse angles

and 15 acute angles.





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Robin says:

‘This angles measures 40°.’

Is Robin correct? Explain.

TALKING TIME:





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Robin says:

‘This angles measures 40°.’

Is Robin correct? Explain.

TALKING TIME:

No. Robin should be reading the

inner scale. The angle is 140°.





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Nisha says:

‘This angle measures 110°’

Is this Nisha correct? Explain.

TALKING TIME:





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Nisha says:

‘This angle measures 110°’

Is this Nisha correct? Explain.

Nisha has not started meauring at 0°. This

angle is 100° because 110° - 10° = 100°

TALKING TIME:





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Work out the correct angle. Can you explain your answer?

ACTVITY 3:





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

Work out the correct angle. Can you explain your answer?

ACTVITY 3:

140°

(160° - 20°

= 140°)100°

(150° - 50° =

100°)

90°

(110° - 20° =

90°)





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

TALKING TIME:

The pointer moves 100° clockwise. Where will it stop?

What can help you to estimate this?





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

TALKING TIME:



We know that 100° is 10°

larger than a right angle.





Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

TALKING TIME:







Success Criteria:

Mastery:



nearest degree.

Greater Depth:


accurately with a



problems.

01/05/2020

TALKING TIME:



We know that 170° is 10°

less than a straight line.


To be able to measure accurately with a protractor...

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