I couldn't find an exact forum for this here - but it's very basic so I'd imagine anyone could help with it, and it stems from an algebra question so....
Basically when doing problems without using the calculator I've been finding that I'm having to do large long multiplications that seem like a pretty poor way to go about solving a problem.
My question is : am I going about things the correct way, and merely need to improve at them, or is there a different method that I haven't thought of for this?
So here's a multiplication of the type that I'm talking about.
As you can see, even though the answers is correct (hoorah...) the odds of me messing something up along the lines are fairly high. And I'm doing this with the luxury of a whiteboard space to spread out on....
How would you approach / do this problem?
Here's the problem in full if you'd like to see the question as presented