Question

How can i factor 27+12

Answer 1

= 27 + 12
3 is common in both of them so
= 3 (9 + 4)
The answer is 3(9+4).

Answer 2

Firstly look for the highest number which goes into both of them:

1 goes into both of them
3 goes into both of them and is the highest so we use this one.

Next write a 3 outside a set of brackets:
$3(\ )$

Then, the point of these brackets is that you times everything inside them by 3 so in order to get the numbers inside, you divide both by 3.

$27 \div 3 = 9$
$12 \div 3 = 4$

So now put these back into the brackets and you're done:

$3(9+4)$

Try to factorise $18+12$ now to make sure you understand.