Grade 4 · Math · Unit 10 of 12
Angles & Area
Acute, right, obtuse and area
What your child practises
Sorting angles into acute, right, obtuse and straight, finding area by multiplying length by width, and working backward to find a side.
Nova Scotia Curriculum learning outcome: M03 · area of regular and irregular 2-D shapes
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
A rectangle is 11 cm long and 3 cm wide. What is its area in square centimetres?
answer box
33
Hint: Area = length × width.
Question 2
A rectangle has an area of 72 square centimetres. It is 12 cm long. How wide is it, in centimetres?
12 × = 72
answer box
6
Hint: Divide the area by the length to find the width.
Question 3
A rectangle is 11 cm long and 7 cm wide. What is its area in square centimetres?
answer box
77
Hint: Area = length × width.
Question 4
A straight line makes what kind of angle?
- right angle
- obtuse angle
- straight angle
straight angle
Hint: It is flat, like half a turn.
Question 5
What kind of angle is this?
- acute
- right
- straight
- obtuse
right
Hint: Acute is smaller than a square corner. Right is a square corner. Obtuse is bigger but not flat. Straight is flat.
Question 6
What kind of angle is this?
- acute
- right
- obtuse
- straight
straight
Hint: Acute is smaller than a square corner. Right is a square corner. Obtuse is bigger but not flat. Straight is flat.