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Multiplication of Two Negative Integers

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Multiplication of two Negative Integers:

Statement Observation
(– 10) × (– 12) = + 120  = 120. Result is a positive integer.
(–15) × (– 6) = + 90 = 90. Result is a positive integer.
(- 31) × (– 100) = + 3100 = 3100 Result is a positive integer.
( -25) × (– 72) = + 1800 = 1800 Result is a positive integer.
( - 83) × (– 28) = + 2324 = 2324 Result is a positive integer.

So observing these products we can say that the product of two negative integers is a positive integer. We multiply the two negative integers as whole numbers and put the positive sign before the product.

In general, for any two positive integers a, and b, (– a) × (– b) = a × b.

Example

Multiply.

(-5) × (-2)

(- 5) × (- 2) = 10

Example

Multiply.

(- 67)  x - 9

(- 67)  x - 9 = 603

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