math是单数。
He has a block when it comes to math .一碰上数学，他的脑子就木了。
He was always bottom of the class in math .他的数学成绩在班上总是垫底。
He has a mental block about math .他一遇到数学问题就糊涂。
She is in the top set in maths .她在数学成绩最好的班上。
Tom has made enormous strides in his maths this term .汤姆本学期数学大有进步。
