Integers - Chapter 1: Class 7 Maths NCERT Book (PDF) is available here. Download now and prepare for CBSE Class 7 School exams 2021-22 ...

What distinguishes this approach--which my students and I called “The System"--is that it involves combining numbers rather than adding or subtracting them, as illustrated here: ...

Integers (Chapter 1) Class 7 Maths NCERT Book (PDF) ... ⇨ Integers are closed for addition & subtraction both. That is, a + b & a – b are again integers, where a & b are any integers.