Maths on the Back of an Envelope: Clever ways to (roughly) calculate anything. An entertaining introduction to mental maths and problem solving

Yes, The Book Bundle offers free UK delivery on orders over £35. This makes bundles and multi-book orders especially good value.

Discounts may come from publisher offers, special stock opportunities, clearance lines or bulk-buying advantages. The downside is that stock sells out extremely fast so we can't guarantee that your set will be available tomorrow. Secure it today.

Yes. The Book Bundle sells genuine books from recognised publishers and suppliers. Product pages may include details such as ISBN, publisher, format and author information so customers can check the edition before ordering.

All books sold by The Book Bundle are brand new.This makes them suitable for gifts, schools, home libraries, and collectors.

The price shown is for the product described on the page. If the title says “collection”, “bundle”, “box set” or “set”, the price is for the full set described, not just one book.

We dispatch orders in 24 hours, and it usually takes 48-72 hours to arrive.