SG chevron_right Primary 5 chevron_right Measurement

Need help for these 4 P5 Area Of Triangle questions. Thks

SG chevron_right Primary 5 chevron_right Fractions

https://www.youtube.com/watch?v=emBs6rN_5N4

SG chevron_right Primary 6 chevron_right Number and Algebra

SG chevron_right Primary 4 chevron_right Geometry

How to solve?<div>Thanks</div>

SG chevron_right Primary 3 chevron_right Number and Algebra