Checking and securing understanding of changing the subject | Maths

Starter quiz

If the side of an equilateral triangle is $3n+1$ , write an expression for the perimeter.
- '3(3n+1)' ✓
If the side of a regular pentagon is $14y - a$ write an expression for the perimeter.
- '5(14y - a)' ✓
Which of the following is an expression for the area of a square with side length $3x$
- $3x^2$
- $(3x^2)$
- $(3x)^2$ ✓
What is the value of $x$ for $5(x + 7) = 30$ ?
- '-1' ✓
If $x$ is a positive integer, what is the value of $x$ for $x^2 - 4 = 0$ ?
- '2' ✓
What is the value of $x$ for $2x - 3 = 7$ ?
- '5' ✓