Advanced Maths Vocabulary

Mathematics · Mathematical Thinking · ages 10-11

Name ______________________ Date ____________

A circle has diameter 14 cm. What is its radius in centimetres?
Answer: ______________
A circle has radius 5 cm. What is its diameter in centimetres?
- 5
- 15
- 20
- 10
Which word means the distance all the way across a circle, through the center?
- Diameter
- Radius
- Circumference
Which is the correct way to write a volume of 60 cubic centimetres?
- 60 cm
- 60 cm²
- 60 cm³
A circle has radius 7 cm. Using 22/7 for pi, what is its circumference in centimetres? Give your answer as a decimal.
Answer: ______________
You work out a box's volume as 2 × 3 × 5 = 30. How should you write the answer with the correct unit?
- 30 cm
- 30
- 30 cm³
Which of these is an equation?
- 3x + 5 = 20
- 3x + 5
- The volume rule V = lwh
- 60
Mia says the diameter is twice the radius. A circle has radius 6 cm and Mia claims the diameter is 12 cm. Is Mia right?
Circle one: True False
Priya says, 'The circumference of the circle is 10 cm because that is the straight line across the middle.' What is her mistake?
- She described the diameter, not the circumference
- She described the radius, not the circumference
- She is correct
Which sentence uses the circle words correctly?
- The radius is twice the diameter
- The circumference is a line through the centre
- The diameter passes through the centre and the circumference is the distance around
- The diameter is half the radius

Answer key

For grown-ups. Fold this page away before handing over the rest.

7 · The radius is 7 cm because the radius is half the diameter: 14 / 2 = 7.
10 · 10 cm is correct because the diameter is twice the radius: 2 times 5 = 10.
Diameter · The diameter runs straight across the circle, through the center. The radius only reaches from the center to the edge, and the circumference is the distance around the outside.
60 cm³ · The small 3 shows three dimensions multiplied together. cm is just a length, and cm² is an area.
44 · The circumference is 44 cm because 2 times 22/7 times 7 equals 44.
30 cm³ · Multiplying three lengths in centimetres gives a volume, so the answer needs cm³, not just cm or no unit at all.
3x + 5 = 20 · 3x + 5 = 20 is the equation because only it sets two things equal with an equals sign.
True · Mia is right. Twice 6 is 12, which matches her claim.
She described the diameter, not the circumference · A straight line across the middle is the diameter. The circumference is the distance all the way around the outside edge.
The diameter passes through the centre and the circumference is the distance around · The third sentence is correct: the diameter crosses the centre and the circumference goes around.