Question

Write the number "five hundredths, six thousandths, forty-two millionths" as a decimal.

Answer 1

0.05642 So in this case when it comes to decimals you need to know the placements of the decimals. 
1. The first number after the decimal 0.0 is the Tenths place
2. The number after the 1st number of the decimal is the Hundredths place
3. Then comes Thousandths
4. Then comes millionths 

Answer 2

0.05642

Hope this helps!