Rearranging formulaeIB MYP Maths Standard: Flashcards

What these 12 flashcards ask

What is the subject of a formula?
What does it mean to rearrange a formula?
Make u the subject of v=u+at.
Make a the subject of v=u+at.
In what order do you undo operations?
Make h the subject of A=\frac12(a+b)h.
Make a the subject of A=\frac12(a+b)h.
Make r the subject of A=\pi r^2.
Make t the subject of d=5t^2.
What undoes a square root?
Make x the subject of y=\sqrt{x}+4.
Which root do you use for a length or time?

Exam questions on Rearranging formulae

A car accelerates in a straight line with constant acceleration $a$ m/s². It starts at speed $u$ m/s and has speed $v$ m/s after $t$ seconds, where $v=u+at$ .
A car starts at $7$ m/s and reaches $25$ m/s with acceleration $3$ m/s². Rearrange the formula to make $t$ the subject and find $t$ .2 marks
The area $A$ of a trapezium with parallel sides $a$ and $b$ and perpendicular height $h$ is $A=\frac{1}{2}(a+b)h$ .
A trapezium has area $44$ cm $^2$ , height $8$ cm and one parallel side $a=7$ cm. Make $b$ the subject of the formula and find $b$ .2 marks
The volume $V$ of a cone with base radius $r$ and height $h$ is $V=\frac{1}{3}\pi r^2h$ .
Make $r$ the subject of the formula.3 marks

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).