vocabulary
Maths vocabulary for age 12
Key words and phrases children around age 12 need to hear, use and understand.
Quick answer
By the end of this page, you'll understand the most important maths vocabulary that children aged 12 need to know, so you can talk about maths, solve problems, and feel confident in class.Learning outcome
By the end of this page, you will be able to use and understand the key maths words that help you talk about numbers, shapes, measurements, and problems, so you can confidently explain your maths thinking to others. Success signs:- You can explain what "product", "perimeter", and "fraction" mean
- You can use maths words when solving problems
- You can match maths words to what they describe
- You can talk about maths with friends and family
Why this matters
Maths vocabulary helps you understand what a question is asking. When you know the words, you can solve problems faster and explain your thinking clearly. Whether you're doing your homework, playing a game, or helping with the shopping, knowing maths words makes everything easier. The more you know the words, the more confident you’ll feel in your maths learning.How it works
Maths words are like a language. Just like you need to know the words to talk about your day, you need to know maths words to talk about numbers and shapes. We’ll look at words for numbers, shapes, measurements, and problem-solving. You’ll learn how to use them and why they matter.Examples you can see
Let’s look at some important maths words and what they mean:| Word | What it means | Example |
|---|---|---|
| Sum | The answer to an addition problem | 3 + 5 = 8. The sum is 8. |
| Difference | The answer to a subtraction problem | 10 - 4 = 6. The difference is 6. |
| Product | The answer to a multiplication problem | 4 × 3 = 12. The product is 12. |
| Quotient | The answer to a division problem | 15 ÷ 3 = 5. The quotient is 5. |
| Perimeter | The distance around a shape | A square with sides of 5 cm has a perimeter of 20 cm. |
| Area | The space inside a shape | A rectangle that is 4 cm long and 3 cm wide has an area of 12 cm². |
| Fraction | A part of a whole | One half is written as ½. |
| Decimal | A number with a decimal point | 0.5 is a decimal. |
| Percentage | A part of 100 | 50% means 50 out of 100. |
Try it as a mini adventure
Adventure: The Maths Word Hunt You are a detective looking for the secret words in a treasure map. Each clue tells you a maths word, and you need to find it in a real-life situation. 1st time: You see a box of 4 rows with 5 chocolates in each row. What word do you use for the total? 2nd time: You see a pizza cut into 8 equal slices. You eat 3 slices. What word describes how many slices are left? 3rd time: You see a rectangle with a length of 6 cm and a width of 4 cm. What word do you use for the space inside? 4th time: You see 3 groups of 7 apples. What word do you use for how many apples there are in total? 5th time: You see a shape with 4 sides of equal length. What word describes this shape? Can you solve the clues and find the words?Common mistakes
- Mistake: Thinking "sum" means the answer to a multiplication problem.
Why it happens: Confusing words that sound similar.
Fix: Remember: sum = addition, product = multiplication. - Mistake: Saying "perimeter" is the space inside a shape.
Why it happens: Mixing up "around" and "inside".
Fix: Perimeter is the distance around the edge. - Mistake: Thinking "decimal" and "fraction" are the same.
Why it happens: Both show parts of a whole.
Fix: A decimal uses a point, a fraction uses a line.
Parent and carer guide
As a parent or carer, you can help by:- Using maths words in everyday conversations, like "What’s the difference between 8 and 5?"
- Playing games where you ask your child to explain what a word means
- Looking at word cards or posters together to learn new words
- Encouraging your child to use words when solving problems
- Not worrying if they forget a word at first – it’s normal to learn new vocabulary over time
Practice questions
- What word means the answer to an addition problem?
- Answer: Sum
- What is the product of 6 and 7?
- Answer: 42
- What word means the space inside a shape?
- Answer: Area
- If you have 10 apples and eat 3, what is the difference?
- Answer: 7
- What is 0.25 as a fraction?
- Answer: ¼
FAQ
What maths words should a 12-year-old know?
A 12-year-old should know words like sum, difference, product, quotient, perimeter, area, fraction, decimal, percentage, and more.
Why are maths words important?
Maths words help you understand what a problem is asking and how to solve it. They also help you explain your thinking clearly.
How can I help my child learn maths words?
Use the words in daily life, play games, read together, and encourage your child to talk about their maths thinking.
What if my child forgets a word?
That’s normal! Keep practicing, and use the word in different situations so it becomes familiar.
Can maths words be fun?
Yes! You can play word games, make up stories, or use the words in silly rhymes to make them stick.