'Maths for Mums and Dads' and 'Maths on the Go' by Rob Eastaway and Mike Askew.

Maths for Mums and Dads by Rob Eastaway, Mike Askew (Hardcover, 2010)

Maths for Mums and Dads by Rob Eastaway, Mike Askew, Revised & Updated 2013

More Maths for Mums and Dads, Eastaway, Rob & Askew, Mike, Used; Very Good Book

More Maths for Mums and Dads By Rob Eastaway, Mike Askew

More Maths for Mums and Dads - Askew, Mike