Teaching pack · Year 7 Measurementseegongsik /au
Interior angle sum of a triangle: a week of ready-to-teach maths
Five days of lessons for Year 7 Measurement. Print this pack and the week is prepared.
AC9M7M05
demonstrate that the interior angle sum of a triangle in the plane is 180° and apply this to determine the interior angle sum of other shapes and the size of unknown angles
Start here: five minutes to Monday
- Skim the week at a glance.
- Print the five days (plan + worksheet each).
- Cut out the card sheet once.
- Open the free interactive unit on your board.
- Teach from the plan.
On the board
On-screen pictures: “Three corners make a straight line”, “Finding the third angle”, “Angle sums of other shapes”, “Interior and exterior angles”, “Equal sides, equal base angles”.
seegongsik.com/au/y7/measurement/AC9M7M05
Aligned to Australian Curriculum V9 (AC9M7M05). Original material from seegongsik. Descriptors (c) ACARA, CC BY 4.0.
The week at a glance5 lessons
The week at a glance
One lesson a day. Run them in order where you can.
| Day | Lesson | Children learn and do | On screen |
|---|---|---|---|
| 1 | Three corners make a straight line | Practise the idea with talk, board and worksheet | Board: Three corners make a straight line |
| 2 | Finding the third angle | Practise the idea with talk, board and worksheet | Board: Finding the third angle |
| 3 | Angle sums of other shapes | Practise the idea with talk, board and worksheet | Board: Angle sums of other shapes |
| 4 | Interior and exterior angles | Practise the idea with talk, board and worksheet | Board: Interior and exterior angles |
| 5 | Equal sides, equal base angles | Practise the idea with talk, board and worksheet | Board: Equal sides, equal base angles |
Materials
- This pack printed.
- Pencils and the board or projector.
- Optional counters or rulers if a day plan names them.
A note home
This week in maths we work on interior angle sum of a triangle. Ask: What did you practise today?
seegongsik.com/au/y7/measurement/AC9M7M05/pack
Day 1 · Teacher planDay 1 of 5
Three corners make a straight line
Children practise “Three corners make a straight line” with talk, the board picture, and a short worksheet. About 40 minutes.
We are learning to
- explain three corners make a straight line in Year 7 words,
- use the board picture to check thinking,
- record an example on paper.
Success criteria
- I can show one example of today’s idea.
- I can say the idea in a short sentence.
You need
- interactive unit open on “Three corners make a straight line”,
- worksheet (next sheet), one per child,
Lesson flow (about 40 minutes)
| 5 min | Warm-up Ask: “What might help us today?” |
| 10 min | On the board Open “Three corners make a straight line”. Ask: “What changed on the screen?” |
| 15 min | Worksheet Children complete the day sheet. |
| 10 min | Share Ask: “In one sentence, what was today’s idea?” |
On the board
Leave “Three corners make a straight line” on screen for the main block.
seegongsik.com/au/y7/measurement/AC9M7M05
Watch for
- Skipping the board -- bring them back to the picture.
- Correct answer with no explanation -- ask how do you know?
Answers and look-fors
- Meeting the idea sounds like a clear sentence about three corners make a straight line.
Day 1 · Worksheet
Three corners make a straight line
NameClassDate
Use the board picture. Show your thinking.
1. Draw or write one example from the board.
2. What is the main idea in your words?
3. Make a second example of your own.
I know I am right because
I can teach this idea to a partner:Yes □ No □
Day 2 · Teacher planDay 2 of 5
Finding the third angle
Children practise “Finding the third angle” with talk, the board picture, and a short worksheet. About 40 minutes.
We are learning to
- explain finding the third angle in Year 7 words,
- use the board picture to check thinking,
- record an example on paper.
Success criteria
- I can show one example of today’s idea.
- I can say the idea in a short sentence.
You need
- interactive unit open on “Finding the third angle”,
- worksheet (next sheet), one per child,
Lesson flow (about 40 minutes)
| 5 min | Warm-up Ask: “What might help us today?” |
| 10 min | On the board Open “Finding the third angle”. Ask: “What changed on the screen?” |
| 15 min | Worksheet Children complete the day sheet. |
| 10 min | Share Ask: “In one sentence, what was today’s idea?” |
On the board
Leave “Finding the third angle” on screen for the main block.
seegongsik.com/au/y7/measurement/AC9M7M05
Watch for
- Skipping the board -- bring them back to the picture.
- Correct answer with no explanation -- ask how do you know?
Answers and look-fors
- Meeting the idea sounds like a clear sentence about finding the third angle.
Day 2 · Worksheet
Finding the third angle
NameClassDate
Use the board picture. Show your thinking.
1. Draw or write one example from the board.
2. What is the main idea in your words?
3. Make a second example of your own.
I know I am right because
I can teach this idea to a partner:Yes □ No □
Day 3 · Teacher planDay 3 of 5
Angle sums of other shapes
Children practise “Angle sums of other shapes” with talk, the board picture, and a short worksheet. About 40 minutes.
We are learning to
- explain angle sums of other shapes in Year 7 words,
- use the board picture to check thinking,
- record an example on paper.
Success criteria
- I can show one example of today’s idea.
- I can say the idea in a short sentence.
You need
- interactive unit open on “Angle sums of other shapes”,
- worksheet (next sheet), one per child,
Lesson flow (about 40 minutes)
| 5 min | Warm-up Ask: “What might help us today?” |
| 10 min | On the board Open “Angle sums of other shapes”. Ask: “What changed on the screen?” |
| 15 min | Worksheet Children complete the day sheet. |
| 10 min | Share Ask: “In one sentence, what was today’s idea?” |
On the board
Leave “Angle sums of other shapes” on screen for the main block.
seegongsik.com/au/y7/measurement/AC9M7M05
Watch for
- Skipping the board -- bring them back to the picture.
- Correct answer with no explanation -- ask how do you know?
Answers and look-fors
- Meeting the idea sounds like a clear sentence about angle sums of other shapes.
Day 3 · Worksheet
Angle sums of other shapes
NameClassDate
Use the board picture. Show your thinking.
1. Draw or write one example from the board.
2. What is the main idea in your words?
3. Make a second example of your own.
I know I am right because
I can teach this idea to a partner:Yes □ No □
Day 4 · Teacher planDay 4 of 5
Interior and exterior angles
Children practise “Interior and exterior angles” with talk, the board picture, and a short worksheet. About 40 minutes.
We are learning to
- explain interior and exterior angles in Year 7 words,
- use the board picture to check thinking,
- record an example on paper.
Success criteria
- I can show one example of today’s idea.
- I can say the idea in a short sentence.
You need
- interactive unit open on “Interior and exterior angles”,
- worksheet (next sheet), one per child,
Lesson flow (about 40 minutes)
| 5 min | Warm-up Ask: “What might help us today?” |
| 10 min | On the board Open “Interior and exterior angles”. Ask: “What changed on the screen?” |
| 15 min | Worksheet Children complete the day sheet. |
| 10 min | Share Ask: “In one sentence, what was today’s idea?” |
On the board
Leave “Interior and exterior angles” on screen for the main block.
seegongsik.com/au/y7/measurement/AC9M7M05
Watch for
- Skipping the board -- bring them back to the picture.
- Correct answer with no explanation -- ask how do you know?
Answers and look-fors
- Meeting the idea sounds like a clear sentence about interior and exterior angles.
Day 4 · Worksheet
Interior and exterior angles
NameClassDate
Use the board picture. Show your thinking.
1. Draw or write one example from the board.
2. What is the main idea in your words?
3. Make a second example of your own.
I know I am right because
I can teach this idea to a partner:Yes □ No □
Day 5 · Teacher planDay 5 of 5
Equal sides, equal base angles
Children practise “Equal sides, equal base angles” with talk, the board picture, and a short worksheet. About 40 minutes.
We are learning to
- explain equal sides, equal base angles in Year 7 words,
- use the board picture to check thinking,
- record an example on paper.
Success criteria
- I can show one example of today’s idea.
- I can say the idea in a short sentence.
You need
- interactive unit open on “Equal sides, equal base angles”,
- worksheet (next sheet), one per child,
Lesson flow (about 40 minutes)
| 5 min | Warm-up Ask: “What might help us today?” |
| 10 min | On the board Open “Equal sides, equal base angles”. Ask: “What changed on the screen?” |
| 15 min | Worksheet Children complete the day sheet. |
| 10 min | Share Ask: “In one sentence, what was today’s idea?” |
On the board
Leave “Equal sides, equal base angles” on screen for the main block.
seegongsik.com/au/y7/measurement/AC9M7M05
Watch for
- Skipping the board -- bring them back to the picture.
- Correct answer with no explanation -- ask how do you know?
Answers and look-fors
- Meeting the idea sounds like a clear sentence about equal sides, equal base angles.
Day 5 · Worksheet
Equal sides, equal base angles
NameClassDate
Use the board picture. Show your thinking.
1. Draw or write one example from the board.
2. What is the main idea in your words?
3. Make a second example of your own.
I know I am right because
I can teach this idea to a partner:Yes □ No □
Cut-out cardsReuse all week
Talk cards for Interior angle sum of a triangle
Cut out. Hold up a card and give an example.
Three corners make a straight line
Give an example.
Finding the third angle
Give an example.
Angle sums of other shapes
Give an example.
Interior and exterior angles
Give an example.
Equal sides, equal base angles
Give an example.
Store in an envelope labelled AC9M7M05.
Mini-check · End of week
Show what you know: Interior angle sum of a triangle
NameClassDate
Work on your own. Use pictures or numbers.
1. Draw or write the big idea of this week.
2. Give one clear example.
3. Give a second different example.
4. What mistake should we watch for?
I can explain this idea to a partner:Yes □ No □
Mini-check · AnswersTeacher
Answers and look-fors
- Item 1 names the unit idea (interior angle sum of a triangle) in child words.
- Items 2-3: two different correct examples.
- Item 4: a real muddle for this topic.
Use day-plan look-fors across the week.