Integers – Class 7

MODEL QUESTIONS FOR CBSE CLASS 7 MATHEMATICS
Integers – Chapter 1
Fill in the blanks:

1. The product of three negative integers is a ———- integer.
2. ————– is the multiplicative identity for integers.
3. For any integers a, b and c, (a x b) x c = a x (b x c).This property is known as ———
4. (-3) x (-2) x (-1) = ——————-
5. (-4) x ———- = 24
6. (-78) x ——– = 78
7. The opposite of 100m above sea level is ————
   Answer the following:
8. Find a) (-6) x 0 x (-78)
   b) (-1) x (-234)
9. Find the product using suitable properties:
   a) 45 x (-23) + (-23) x (-35)
   b) 4 x (-245) x 25
10. Ina class test containing 10 questions, 4 marks are given for every correct answer and (-2) marks are given for every incorrect answer. Mohan attempts all questions but only 7 of his answers are correct. What is his total score?

ANSWERS:

1. Negative
2. One
3. Associativity for Multiplication
4. -6
5. -6
6. -1
7. 100m below sea level
8. a) 0
   b) 234
9. a) (-23) [(45) + (-35)] = (-23) x 10 = -230 by distributive property.
   b) (-245) x 4 x 25 = (-245) x 100 = -24500 by associative property.
10. Marks given for correct answer = 4
    So, marks given for 7 correct answers = 4 x 7 = 28
    Marks given for one incorrect answer = (-2)
    So, marks for 3 incorrect answers = 3 x (-2) = -6
    Therefore, Mohan’s total score = 28 + (-6) = 22.