When I get an email from someone who's really good at maths saying they are confused with the homework, an alarm bell goes off in my brain. ALERT< ALERT "We need to spend more time on this in class".
If page 100 is giving you stress. Don't panic!!! You are not alone. I will go over (again) with you all tomorrow how to convert metres into centimetres into millimetres (involving decimals).
I would rather you leave this page and we'll do it together in the morning, than you have a sleepless night over it.