maths y7 algebra expressions

What you'll learn

1. 1

   Imagine a bag of apples 🍎. You don't know how many are inside — so you call it 'a' apples. That's algebra!

2. 2

   What does the letter 'a' stand for in 'a apples'?

3. 3

   Here are 3 bags of apples. Each bag has 'a' apples inside. That's 3 × a — we write it as 3a.

4. 4

   If a = 5, how many apples in 3a? Let's work it out together.

5. 5

   If a = 4, what is 3a?

6. 6

   Now try 'b'. If b = 6, drag the counters to show 2b.

7. 7

   What does 4x mean when x = 3?