プログレッシブ和英中辞典(第4版)の解説
イコール
〔等号〕an equal(s) sign ((記号 =))
イコールである
equal/be equal ((to))
4足す5イコール9
Four and [plus] five equal(s) [make(s)/are/is] nine.
8引く3イコール5
「Three from eight [Eight minus three] is [leaves] five.
31割る4イコール7余り3
Thirty-one divided by four is [gives] seven 「with three left over [with a remainder of three].