Always be on the look out for tears of frustration, so as to all the child some break. No one learns well enough when confused. At this point both concentration and effective learning are lost. But if you are sure that the tears are merely excuses to skip the homework, pretend to abandon him with the worksheets and let him sweat it out!
Learning math usually of course begins at young age, sometimes even at home, with learning numbers and counting. At kindergarten and then school, students then progress through arithmetic (addition, subtraction, multiplication, and division), and eventually to more advanced topics such as algebra, geometry, graphs and charts, and statistics.
Without being openly sympathetic, inform the child that you understand its frustration. Do not say, Ah, I also don't like math! It is, however, very positive to say, math was initially difficult for me, but I pressed on and got the hang of it.
When you're teaching your student to write, there are a whole host of worksheets online that you can use. Many of these include clipart that will help the students learn the sounds of letters and letter combinations. There are other sheets that help the student learn to write his or her numbers. It's helpful having printable worksheets for something like this, because parents often go through quite a few of these before the child masters writing the numbers or letters correctly.