SG chevron_right Primary 6 chevron_right Number and Algebra

Pls help, thanks

SG chevron_right Primary 5 chevron_right Number and Algebra

SG chevron_right Secondary 3 chevron_right Add Math: Algebra

SG chevron_right Secondary 5 chevron_right Add Math: Algebra

SG chevron_right Primary 5 chevron_right Geometry

Sorry ppl. I do have one more question as to how to find the shaded area in the case shown as below