It is 30 times 45 = 1350 square inches
30 x 45 what? inches, mm's. trick question :) If simply feet, length times width. 30sq. ft. x 45sq. ft. = 1350sq. ft.
To find the HCF you first need to break the numbers down into their prime factors. In this case we have: 30 = 2x3x5 45 = 3x3x5 The next step is to identify any common factors. In this case both numbers have 3 and 5 as prime factors. To find the HCF, multiply these together: 3x5 = 15. To get the LCM, multiply the numbers together then divide by the HCF: 30x45/15 = 90.