GWIN EET HSA MYAUK PAUNG HNOTE - BODMAS, brackets first, then by powers or roots (i.e. of), then Division, Multiplication, Addition, and at the end Subtraction. You are INCORRECT for the calculation at 1:41 which was 30 - 5 + 9 divided by 2 multiplied by 5 , which is 47.5 SO SORRY but not 85!!! also 10 + 5 - 3 X 4 divided by 2 also WRONG, answer is 9!!! I must come and teach