2 ways u could do it: 45 x 24 = 1080 5 x 20 = 100 9+5=14 14x9 = 126 100+126=226 1080-226 = 854 I just worked out the total area of a whole rectangle then took away the missing parts
Or you could split it into different sections: 24x16=384 24-5=19 19x20=380 9x10=90 384+380+90=854
