Lesson 133 – Doodles Do Algebra

lesson133doodlepigcToday’s lesson focuses on teaching your child to extract the square root of any quantity without a calculator or computer. As DoodlePig explains on the worksheet, you simply use a bit of algebra. The lesson sounds difficult, but if is actually quite easy and doesn’t need any explanation.

Download Lesson 133 of Doodles Do Algebra HERE

Answers:

if t=10, t^2=100

if t=20, t^2=400

if t=30, t^2=900

t=20

529-t^2=129

t=20

529-t^2=129

(u+43)(u+3)=0

u=-40 or u=+3

then, t=20 and u=3

So the square root of 529 is 23.