Ok so
(3,225 x 4)
We would distribute each place value of 3,225 and then multiply it by 4
So the value of 3 in 3,225 is 3,000
3,000 x 4 = 12,000
The value of the first two after the 3 is 200
200 x 4 = 800
The value of the other two before 5 is 20
20 x 4 = 80
And finally, the value of the 5 is 5
5 x 4 = 20
Now, we have to add up all of our answers
12,000 + 800 + 80 + 20
Your answer is 12,900