Y11 Rearranging Formula

Y11 Rearranging Formula

Today I thought we would look at rearranging 'harder' formula, where the letter appears more than once, so you have to factorise (see picture)

Lets just recap the basics first...

Multiple Choice

What is the equation to calculate distance?

• distance = speed/time
• distance = time/speed
• distance = speed/distance
• distance = speed x time 

Multiple Choice

What is the equation to calculate time?

• time = speed/distance
• time = distance/speed 
• time = speed x distance 
• time = distance x speed

Multiple Choice

What is the equation to calculate speed?

• speed = distance/time
• speed = time/distance
• speed = time x distance 
• speed = speed/time 

Multiple Choice

Make x the subject of the formula.

 $y=\frac{x}{3}$  

• x=3y

• x=y+3

• x=3/y

• x=y-3

Multiple Choice

Make x the subject of the formula.

y=x+6

• x=y+6

• x=y-6

• $x=\frac{y}{6}$

• x=6y

Multiple Choice

 $v=u+10t$  Make u the subject of the formula

•  $u=v-10t$  

•  $u=v+10t$  

•  $u=\frac{v}{10t}$  

•  $u=\frac{v}{-10t}$  

Multiple Choice

Make w the subject of the formula

 $s=\frac{w}{a}$  

•  $w=\frac{s}{a}$  

•  $w=sa$  

•  $w=\frac{a}{s}$  

•  $w=s+a$  

HEAD TO MATHSPAD

Please watch the video on Mathspad and complete the task 'Rearranging Formulae: Two steps with division.

Harder rearranging

Write this example down if you want to, but all need to watch the video on the next slide.

As you can see in the answer from the picture, you have to expand, rearrange, and then factorise the 'y' because there is more than one and you want 'y' on its own.

Questions to practice on classroom

If you want to check answers as you go then speak to me!

I will give all the answers 5 mins before the end of the lesson.