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Rule of Signs
Last updated at January 21, 2026 by Teachoo
Integer Expressions - Properties and Pattern
Class 7 (Ganita Prakash 1, 2 & old NCERT)
Chapter 2 Class 7 - Operations with Integers (Ganita Prakash II)
- Quick Recap on Intergers
- Carrom Coin Integers
- Token Model for Adding and Subtracting Integers
- Multiplication of Integers
- Patterns in Integer Multiplication
- Brahmagupta’s Rules for Multiplication and Division of Integers
- A Magic Grid of Integers
- Division of Integers
- Figure it out - Page 39
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Integer Expressions - Properties and Pattern
- Figure it out - Page 42, 43, 44
Transcript
Rule of SignsLet’s Look at the following series of multiplications: – 1 × – 1 = 1 – 1 × – 1 × – 1 = – 1 – 1 × – 1 × – 1 × – 1 = 1 – 1 × – 1 × – 1 × – 1 × – 1 = 1 We notice that When –1 is multiplied 2 or 4 times the product is positive When it is multiplied 3 or 5 times the product is negative Using this, we can form rules while multiplying or dividing Integers The rules are If you multiply or divide a negative number an even number of times (2 times, 4 times...), the answer is Positive (+) If you multiply or divide a negative number an odd number of times (3 times, 5 times...), the answer is Negative (-)
