A simple algorithm of 23 / 19 plus 7 / 15 minus (9 / 19 minus 8 / 15)

A simple algorithm of 23 / 19 plus 7 / 15 minus (9 / 19 minus 8 / 15)


=(23/19-9/19)+(7/15+8/15)
=14/19+1
=33/19



99+11×19+11×80______ .


99 + 11 × 19 + 11 × 80 = 99 + (19 + 80) × 11, = 99 + 99 × 11, = (11 + 1) × 99, = 12 × (100-1), = 12 × 100-12, = 1200-12, = 1188



How to calculate simply 19 plus 99 times 19


19+99*19=19*(1+99)=19*100=1900



The sum of two numbers is 360 more than the first addend and 80 more than the second. What is the sum of these two numbers


360+80=440 360-80=280