In Britain we say, 'Five time three equals fifteen.' But, five times three is equal to fifteen is grammatically correct. 4/2=2 Four divided by two equals two. 2+2=4 'Two plus two is four' or 'Two plus two equals four' 5-3=2 'Five minus three equals two' or 'Five take three equals two' 5^2=25 'Five squared equals twenty five' or 'Five to the power of two equals twenty five' √25 = 5 'The square root of twenty five equals five' log (100) = 2 'Log one hundred equals two' or 'The log of one hundred is two' Ln(e) = 1 'The natural log of E equals one' or 'The natural log of E is one'