Hollywood actor Ashton Kutcher has turned into a math teacher to helps his stepdaughter Tallulah do her homework. The 'Spread' star has been struggling to relearn algebra so he can help his wife actress Demi Moore's 15-year-old daughter Tallulah with her homework,Contactmusic reported. "Sometimes I think the only reason I took math is so I could help my kids take math," Kutcher wrote on his Twitter page. "Assisting on some 10th grade math home work. BTW the absolute value of -4 is indeed 4. Now solving f(x)=-3lx-4l when x