Class 7 · Chapter 1

Integers

Properties of integers, multiplication and division of integers, distributive law.

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Detailed theory

Product of two positives = positive. Two negatives = positive. Positive × negative = negative. E.g.

(-3) \times (-4) = 12

;

(-3) \times 4 = -12

Key concepts & formulas

Integers =

\ldots, -3, -2, -1, 0, 1, 2, 3, \ldots

Product/quotient of two negatives is positive.

a - b = a + (-b)

Division by

0

is not defined.

a(b+c) = ab + ac

(distributive law).