multiplication and division of integers class 7 | Practice set 8 class 7
In this article multiplication and division of integers class 7 we give the information about Class 7 Maths Chapter 2 Practice Set 9 and Practice set 8 class 7.
multiplication and division of integers class 7:
Practice Set 8
Rules for Multiplication for two numbers:
- (Positive number) × (Positive number) = (Positive number)
- (Positive number) × (Negative number) = (Negative number)
- (Negative number) × (Positive number) = (Negative number)
- (Negative number) × (Negative number) = (Positive number)
Question: Multiply
(i) (-5) × (-7) = ?
Rule: (Negative number) × (Negative number) = (Positive number)
Therefore, (-5) × (-7) = 35.
(ii) (-9) × (6) = ?
Rule : (Negative number) × (Positive number) = (Negative number)
Therefore, (-9) × (6) = -54.
(iii) (9) × (-4) = ?
Rule: (Positive number) × (Negative number) = (Negative number)
Therefore, (9) × (-4) = -36
(iv) (8) × ( -7) = ?
Rule: (Positive number) × (Negative number) = (Negative number)
Therefore, (8) × (-7) = -56
(V) (-124) × (-1) = ?
Rule: (Negative number) × (Negative number) = (Positive number)
Therefore, (-124) × ( – 1) = 124
(Vi) (-12) × ( -7 ) = ?
Rule: (Negative number) × (Negative number) = (Positive number)
Therefore, (-12) × ( – 7) = 84
(Vii) (-63) × (-7) = ?
Rule: (Negative number) × (Negative number) = (Positive number)
Therefore, (-63) × ( – 7) = 441
(Viii) (-7) × (15) = ?
Rule : (Negative number) × (Positive number) = (Negative number)
Therefore, (-7) × (15) = -105.
Division of Integers:
(i) To divide any positive integer by a negative integer
Ex. 9 / -2 = -9 / 2
(ii) To divide any negative integer by a negative integer.
Ex. -20 / -5 = 4.
(iii) When one integer is divided by another non-zero integer, it is customary to write the denominator of the quotient as a positive integer.
Ex. 11 / -3 = -11 / 3
Rules for Division for two numbers:
- We cannot divide any number by zero.
- The quotient of two positive integers is a positive number.
- The quotient of two negative integers is a positive number.
- The quotient of a positive integers and a negative is always a negative number.
Practice Set 9:
1.Solve :-
(i) (- 96) ÷ 16 = ?
Ans:-
Rule: The quotient of a positive integers and a negative is always a negative number.
Therefore, (- 96) ÷ 16 = -6
(ii) 98 ÷ ( -28) = ?
Ans:-
Rule: The quotient of a positive integers and a negative is always a negative number.
Therefore, (- 98) ÷ 28 = -49 / 14 = – 7 / 2
(iii) (- 51) ÷ ( 68) = ?
Ans:-
Rule: The quotient of a positive integers and a negative is always a negative number.
Therefore, (- 51) ÷ 68 = -51 / 68
(iv) 38 ÷ ( -57) = ?
Ans:-
Rule: The quotient of a positive integers and a negative is always a negative number.
Therefore, (- 38) ÷ 57 = -2 / 3
(v) (- 85) ÷ ( 20) = ?
Ans:-
Rule: The quotient of a positive integers and a negative is always a negative number.
Therefore, (- 85) ÷ 20 = -17 / 4
(vi) (-150) ÷ ( -25) = ?
Ans:-
Rule: The quotient of two negative integers is a positive number.
Therefore, (- 150) ÷ (-25) = 6
(vii) 100 ÷ 60 = ?
Ans.:-
Rule : The quotient of two positive integers is a positive number.
Therefore, 100 ÷ 60 = 10 / 6 = 5 / 3
(viii) 9 ÷ ( -54) = ?
Ans.:-
Rule : The quotient of a positive integers and a negative is always a negative number.
Therefore, 9 ÷ (-54) = -1 / 6
(ix) 78 ÷ 65 = ?
Ans.:-
Rule : The quotient of two positive integers is a positive number.
Therefore, 78 ÷ 65 = 78 / 65
(x) (-5) ÷ ( -315) = ?
Ans.:-
Rule : The quotient of two negative integers is a positive number.
Therefore, (- 5) ÷ (- 315)= 1 / 63
Q2. Write three divisions of integers such that the fractional from of each will be 24 / 5.
Ans.:- i) 48 / 10
ii) 72 / 15
iii) 96 / 20
Q3. Write three divisions of integers such that the fractional from of each will be -5 / 7.
Ans:- i) -10 / 14
ii) -15 / 21
iii) – 20 / 28
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