Integers

For any two integers, the sum (a+b) is also an integer. Name the property.

• Commutative

• Closure

• Associative

• Identity

23 + (-16) + (-7) = ________________

• -46

• +46

• 0

• None of the above

15 x (-34) + 34 x (-25) = ________________

• 1340

• 340

• -340

• -1360

In a class test, 5 marks awarded for every correct answer and 1.5 marks will be deducted for every wrong answer. If Kavya answers 9 correct answers and 4 wrong answers, then what is her final score?

• 45

• 39

• 51

• 44

Identify true or false.

Division of integers is commutative but not associative.

• True

• False

• Both

• None of the above

(-55) x (-9) = ________________

• -495

• -445

• 445

• 495

Identify a pair of integers whose sum is -6.

• -4 & -2

• 4 & 2

• - 3 & +3

• -4 & +4

Which of the following statements is wrong?

• When a positive integer and a negative integer are added, we always get a negative integer

• Additive inverse of 8 is (-8)

• Additive inverse of 8 is (-8)

• For subtraction, we add the additive inverse of the integer that is being subtracted, to the other integer.

(-1) × (-1) × (-1) × ……… 10 times is equal to

• -1

• 1

• 1 or -1

• None of these

Manish deposits Rs 2000 in his bank account and withdraws Rs 1000 from it, the next day. Find the balance in Manish’s account after the withdrawal.

• Rs 2000

• Rs 3000

• Rs 1000

• None of these