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Standard VII
Mathematics
Multiplication of Integers
Question

Sign of the product of 231 negative integer and 9 positive integer is
  1. Positive
  2. None of these
  3. Negative
  4. 0

A
Negative
B
Positive
C
None of these
D
0
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Solution
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We know that the product of two integers with unlike signs (two integers, one with positive sign and one with negative sign) is always negative.

The given two integers are −231 and +9 and the product of these integers is:

(−231)×(+9)=−(231×9)=−2079 which is a negative integer.

Hence, sign of the product of the given integers is negative.

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Q1
Sign of the product of 231 negative integers and 9 positive integers is
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Q2
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Q3
What will be the sign of the product if we multiply together
(i) 8 negative integers and 1 positive integer?
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Q4
State true or false.
(i) The product of a negative and a positive integer may be zero.
(ii) The product of two negative integers is always positive.
(iii) The product of two integers with opposite signs is the same as the product of their absolute values.
(iv) If exactly one of the three given integers is negative, then product is always negative.
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Q5

Product of a negative integer and a positive integer is a positive integer.


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