1
Variables
A letter like x stands for a number we want to find.
x + 5 = 12 → x = 7
Algebra
📖 Study · Algebra
Algebra
Algebra uses letters to stand in for numbers we don't know yet.
🎯 What you'll learn
- ✓Solve x + a = b
- ✓Solve a × x = b
- ✓Use BIDMAS / order of operations
2
Solve simple equations
Do the opposite operation to both sides. x + 5 = 12 → x = 12 − 5 → x = 7.
x + 5 = 12 → x = 7
3
Solving with × and ÷
If 3y = 15, divide both sides by 3 → y = 5.
3y = 15 → y = 5
4
Order of operations
Brackets first, then × ÷, then + −. Remember BIDMAS.
B I D M A S
5
Examples
2 × (3 + 4) = 2 × 7 = 14. 10 − 6 ÷ 2 = 10 − 3 = 7.
2×(3+4) = 14 10 − 6÷2 = 7