My brother is having trouble with dividing fractions (he’s in 5th grade) any tips

I have six brothers and I am the oldest in my family. I have had to help out many times with their school.

The only thing I can say is make sure you work with him everyday, or else he might forget what he's learned. Also, make sure you provide clear and simple instructions to him. I hope this answers your question.

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents