IGCSE Maths Edexcel A 4MA1

understand that a letter may represent an unknown number or a variable

use correct notational conventions for algebraic expressions and formulae

substitute positive and negative integers, decimals and fractions for words and letters in expressions and formulae

Evaluate $2x - 3y$ when $x = 4$ and $y= -5$

use formulae from mathematics and other real-life contexts expressed initially in words or diagrammatic form and convert to letters and symbols

derive a formula or expression

change the subject of a formula where the subject appears once

*Make $r$ the subject of $A = \pi r^2$

Make $t$ the subject of $v = u + at$*

understand the process of manipulating formulae or equations to change the subject, to include cases where the subject may appear twice or a power of the subject occurs

*Make $r$ the subject of $~V = \dfrac{4}{3} \pi r^3$

Make $a$ the subject of $~3a + 5 = \dfrac{4-a}{r}$

Make $l$ the subject of $~T = 2\pi\sqrt{\dfrac{l}{g}}$*