https://nurupress.com/en/blog/Practical tips around our books: learning math facts, keeping the mind sharp, solving puzzles, preparing for a test, and winding down at the end of the day.enhttps://nurupress.com/en/blog/addition-subtraction-within-20/https://nurupress.com/en/blog/addition-subtraction-within-20/Wed, 21 Oct 2026 08:00:00 GMTMake 10, use doubles, connect addition and subtraction: six simple strategies that help children ages 6–8 add and subtract within 20 with confidence, plus a low-pressure way to practice.