The document provides instruction on identifying the number of degrees in various angles like right angles, on a straight line, and around a point at different levels of difficulty. It includes examples of solving problems relating to these angles and classifying them as acute, obtuse, or reflex angles. The objective is to build skills in calculating angles in various configurations at levels 4 and 5.

1. Entry Activity – Find 
a) 90 – 50 =  h)90 - = 10
b)90 – 40 =  i) 180 - = 50
c) 180 – 100 =  j) 90 - = 80
d)180 – 55 =  k) 180 - = 150
e) 90 – 18 =  l) 90 - = 15
f) 90 – 32 =  m)180 - = 32
g) 180 – 48 =  n)90 - = 47

2. Entry Activity – Find 
a) 90 – 50 =  h)90 - = 10
b)90 – 40 =  i) 180 - = 50
c) 180 – 100 =  j) 90 - = 80
d)180 – 55 =  k) 180 - = 150
e) 90 – 18 =  l) 90 - = 15
f) 90 – 32 =  m)180 - = 32
g) 180 – 48 =  n)90 - = 47

3. Today I will learn to identify the number of
degrees in right-angles, on a straight line and
round a point Level 4+
Challenge Objective: To solve problems relating
to angles in a right-angle, on a straight line and
round a point Level 5
Key Words
• Angle
• Degree
• Right-angle
• Straight-line

4. Today I will learn to identify the number of degrees in
right-angles and on a straight line Level 4
Reflex angle
More than 90˚ but less than 180˚
Less than 90˚
Right-angle
Straight-line 180˚
90˚ More than180˚
Obtuse angle Acute angle

5. Today I will learn to identify the number of degrees in
right-angles and on a straight line Level 4
90˚
Straight-line 180˚
Right-angle
More than 180˚
Less than 90˚
Reflex angle Obtuse angle
Acute angle
More than 90˚ but less than 180˚

6. To solve problems relating to angles in a
right-angle and on a straight line Level 5

7. To solve problems relating to angles in a
right-angle and on a straight line Level 5
5˚
40˚
70˚
10˚
41˚
45˚ 52˚
35˚

8. To solve problems relating to angles in a
right-angle and on a straight line Level 5

9. To solve problems relating to angles in a
right-angle and on a straight line Level 5
100˚
60˚ 125˚
80˚ 102˚
25˚
95˚ 112˚ 66˚

10. Today I will learn to identify the number of
degrees in right-angles, on a straight line and
round a point Level 4+
Challenge Objective: To solve problems relating
to angles in a right-angle, on a straight line and
round a point Level 5
Key Words
• Angle
• Degree
• Right-angle
• Straight-line

11. Level 5
Extension

12. Today I will learn to identify the number of
degrees in right-angles, on a straight line and
round a point Level 4+
Challenge Objective: To solve problems relating
to angles in a right-angle, on a straight line and
round a point Level 5
Key Words
• Angle
• Degree
• Right-angle
• Straight-line

13. To calculate angles round a point Level 5

14. To calculate angles round a point Level 5

15. To calculate angles round a point Level 5
Extension

16. I can identify the number of degrees in
right-angles Level 4
I can identify the number of degrees on
a straight line Level 4
I can identify the number of degrees
round a point Level 4
I can solve problems relating to angles
in a right-angle Level 5
I can solve problems relating to angles
on a straight line Level 5
I can solve problems relating to angles
round a point Level 5