Step by step
The question
Question: write 7/25 as a decimal.
1 Make the bottom 10, 100 or 1000
A decimal is tenths, hundredths, thousandths.
So we want a bottom of 10, 100 or 1000.
25 times 4 is 100.
We multiply the top and the bottom by 4.
4/4 is 1, so the value stays the same.
7 times 4 is 28.
So we get 28/100.
2 Write the decimal
100 has 2 zeros.
So the decimal has 2 digits after the point.
28 hundredths is 0.28.
3 Check
Let's check: the decimal times the bottom should give the top.
0.28 times 25.
Forget the points: 28 times 25 is 700.
The numbers have 2 digits after the point.
So the answer has 2 too: 7.00, which is 7.
We get 7, the top.
So the answer is right!
Let's look back.
First: make the bottom 10, 100 or 1000.
Then: write the decimal.
Last: check.