SG chevron_right Primary 4 chevron_right Number and Algebra

We just started Singapore math, and learning the bar model and I am still a little lost. I could use some help on these 2 problems.

SG chevron_right Primary 4 chevron_right Number and Algebra

Please help and thank you in advance.No answer yet.

SG chevron_right Primary 4 chevron_right Number and Algebra

Help!!!

SG chevron_right Primary 4 chevron_right Number and Algebra

Pls help:)

SG chevron_right Primary 3 chevron_right Number and Algebra

I stuck! I can only get 82?4Can't understand the last part.