The affirmative sentence is: that is my math book.

To change the form of interrogative sentences, it IS necessary to promote IS and change the person.

So the result is:

Is that your math book? Is that your math book?

Extended learning:

Is this your math book?

Is this your math book?

Is this your pencil?

Is this your pencil?

Is this your home?

Is this your home?

To learn a new language, it is necessary to expand every learning point, so that the content of learning will grow geometrically.

Moreover, through expansion, we can reorganize what we have learned and deepen our understanding.