Step by step
The question
Question: write 0.42 as a percent.
0.42
1 Write it over 100
0.42 has 2 digits after the point.
So we write it over 100.
2 digits after the point → over 100
0.42 is 42 hundredths: 42/100.
= 42100
Careful!
0.42% means 0.42 out of 100: far too small.
0.42 is 42 out of 100.
Careful: not 0.42 = 0.42% ✗
2 Write the percent
42 out of 100 is 42%.
= 42%
The short way: the point moves 2 places to the right.
0.42 → 42%
the point moves 2 places right
3 Check
Let's check: 42% is 42/100.
42 hundredths is 0.42.
So the answer is right!
Check: 42% = 42100 = 0.42
Let's look back.
First: write it over 100.
Then: write the percent.
Last: check.
Answer
= 42%