Twice a number decreased by 3

Step by step

The question

Question: write with math signs: twice a number decreased by 3.

1 Change words to math

2 Put it in order

So we get 2n − 3.

3 Check

Let's check with a number.

Say the number is 10.

Twice 10 decreased by 3 is 17.

And 2(10) − 3 is 17 too.

So 2n − 3 is right!

Let's look back.

First: change words to math.

Then: put it in order.

Last: check.