BSL Maths Glossary - add - example (symbol +)
Subject level: Foundation
Let’s say if I add 3 plus 2 plus 1, I’ll show you, added altogether these three numbers give us a 6, which is one number. If I say 4 add 2 add 1, you add them altogether and you will end up with a single number, 7. It doesn't matter how many numbers you add up, you will always end up with one number.