Question

what is 9/10 of £90.00

Answer 1

9/10 * 90.00 =
(9 * 90,00) / 10 = 
9 * (90,00 / 10) =
9 * 9,00 = 
£81,00

Answer 2

'of' can be translated into multiply so

9/10 of 90=9/10 times 90

90=90/1
9/10 times 90/1=(9 times 90)/10=810/10=81/1 times 10/10=81