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Year 7 Algebra Cheat Sheet

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Year 7 Algebra Cheat Sheet worksheet preview

Year 7 Algebra Cheat Sheet

Algebra symbols and equations

📚 Key Algebra Definitions & Rules

Variable: A letter that represents an unknown number (e.g., x, y, a)
Expression: A combination of numbers, variables and operations (e.g., 3x + 5)
Like Terms: Terms with the same variable part (e.g., 3x and 7x are like terms)
Substitution Rules:

• Replace the variable with the given number

• Follow order of operations (BODMAS)

• Example: If x = 4, then 2x + 3 = 2(4) + 3 = 8 + 3 = 11

Simplification Rules:

• Collect like terms: 5x + 3x = 8x

• Only add/subtract coefficients of like terms

• Example: 4a + 2b - a + 3b = 3a + 5b

🔧 Expanding & Factorising

Expanding Brackets:

• Multiply everything inside the brackets by the term outside

• Example: 3(x + 4) = 3x + 12

• Example: -2(3y - 5) = -6y + 10

Factorising:

• Find the highest common factor (HCF) of all terms

• Take out the HCF as a common factor

• Example: 6x + 9 = 3(2x + 3)

• Example: 12a - 8b = 4(3a - 2b)

Finding HCF:

• List factors of each number

• Find the largest factor that divides into all numbers

• Example: HCF of 12 and 18 is 6

✏️ Practice Problems

1. Simplify: 7x + 2y - 3x + 5y
2. If a = 3, find the value of 4a - 7
3. Expand: 5(2x - 3)
4. Factorise: 15x + 20
5. Find the HCF of 24 and 36

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