THink about why you want him to have a book. What is it really that is the issue.
My son is 6 years older than my daughter. In 4th grade he was doing multiplication tables. At dinner he would say to my 3 yo "What's 3x3?" When she couldn't answer he would say "It's 9 dummy."
It boiled my blood, Until one day he said "What's 7x4?" and my 3 year old piped up "It's 28, dummy."
His constant poking at her backfired bigtime for him. For her, she was multiplying most of her numbers before kindergarten. He also did it with his spelling words. When he missed a word we were practicing on, and she laughed, he would say "You spell it." It was pretty funny to hear a 3 yo spell b-e-a-u-t-i-f-u-l.
Kids are smarter than we adults think. WHen I counted with the kids I always counted by 1's, 2's, 3's, 5's and 10's. I did this when they were babies.
I sang the state song to them as a lullaby. Before they entered school my kids could say all 50 states in alphabetical order.
We have a power of 2 song. My 5th grader (homeschooled) knew it as a little guy and all of a sudden we are working on powers of 2 and he just sings his song and can give you 2 to the 6 with no problems.
There is a book The 5 Love Languages for Children and Teens. It talks about loving the children. If he loves them unconditionally they will learn to play his games.
And my dad is a HS math teacher, In 2nd grade he said Let's do Algebra!! SO my sister and I were doing Algebra concepts in early elementary school.
I completely blame him for my minor in Math and my inability to understand why people "just dont' get it", like my own daughter.
If your husband is spending time with your son it will not backfire as a teen.