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7th maths assignment answers 2021 pdf (English Medium)

7th maths assignment answers 2021 pdf (English Medium) : Here is the full seventh standard maths assignment answerkey for 2021 tamilnadu english medium students.This answers only covers unit 1 only for July month second assignment please visit this page

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7th maths assignment answers 2021 pdf (English Medium)

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Assignment
Class: VII Subject: Mathematics
Unit – 1
PART – A


I. One Mark Questions

1.Which one of the following is Correct?

a) – 50 +40 = 10
b) – 100+ (-20) = 120
c) 49+56 = 105
d) 78 +(–16) = -62

Answer:- c) 49+56 = 105


2.Which one of the following integers satisfies the equation that comes in the box?
-80 + 30 = – 20
ߛ

a) 40
(b) -30
(c) -40
(d) -70

Answer:- (b) -30


3.Which property of addition satisfies the statement?
[(-345) + (-20)] + 67 = (-345) + [(-20) + 67]

a) Closure
(b) Commutative
(c) Associative
(d) Identity

Answer:- (c) Associative


4.If (-100) +100 = 0, then -100 is

a) additive inverse of 100
b) additive identity of 100
c) Equal to 100
d)The reciprocal of 100

Answer:- a) additive inverse of 100


5.The ascending order of the integers7, -8, 14, 17, 0, -6, -17 is

a) -17, 7, -8, 14, 17, 0, -6,
b) -6, -17, 7, -8, 14, 17, 0
c) 7, -8, 14, 17, 0, -6, -17
d) -17, -8,-6, 0, 7, 14, 17

Answer:- d) -17, -8,-6, 0, 7, 14, 17


6.Which of the following statement is not correct?

a) Addition of integers has closure property
b) Addition of integers has associative property
c) Subtraction of integers has closure property
d) Subtraction of integers has associative property

Answer:- a) Addition of integers has closure property


7. Which one of the following is correct?

a) 12 – 0 =12
b) 0 – 12 = 12
c) 12 x 0 = 12
d) 0 12 = 12

Answer:- a) 12 – 0 =12


8.Choose the correct number line which satisfies the sum (6) + (-5)

Choose the correct number line which satisfies the sum (6) + (-5)

Answer:-


9.The product of (-42) X 5 X (-10) is ……………..

a)– 2100
b)2100
c) 2500
d) -2400

Answer:- b)2100


10.Which one of the following is not satisfying the commutative property of multiplication?

a) (-31) X (-64) = (-64) X (-31)
b) (68) X (-5) = (-5) X (-68)
c) (-42) X (15) = (15) X (-42)
d) (24) X (13) = (13) X (24)

Answer:- b) (68) X (-5) = (-5) X (-68)


PART – B

II. Short Answer:


11.Simplify: 199 + (-20) + (-11)

Answer:-

=199-20-11

= 199-33

= 166


12.An aero-plane is 5000 feet above the sea level. If it descends to 400 feetand it ascends to 300 feet then, what is its new position?

Answer:-

Initial Height = 5000 Feet

Descend Level = -400

Ascend Level = +300 feet

So,

= 5000-400+300

= 5000-100

=4900 Feet

Aero-Plane new position at 4900 feet


13.Niveditha earns Rs. 15000 every month. He spends Rs.8000 for all his family expenditures and Rs. 2800 for his vehicle loan. How much does he save every month?

Answer:-

Niveditha’s Earning = Rs 15000

Family Expenditure = Rs 8000

Vehicle Loan = Rs 2800

Remaining Balance = 15000-8000-2800

=15000-10800

=Rs 4200



14.If a= -70, b=4 and c=-10, verify a × (b × c) = (a × b) × c

Answer:-

a = -70
b = 4
c =-10
ax(bxc) = (axb)xc

LHS = a x (bxc)
bxc = 4x-10 =-40
ax(bxc) = -70x -40
ax(bxc) =2800…..(1)

RHS = (axb)xc
axb = -70 x 4 = -280
(axb)xc = -280 x -10
(axb)xc = 2800 …..(2)

From (1) and (2)
ax(bxc) = (axb)xc Hence Verified



15. The product of two integers is (- 145). One of them is 5. Find the other.

Answer:-

Product of two integers = -145
One of them =5
Another one be x
so,
5x x = -145
x = -145 / 5
x=-29
ie the Other number is -29


16.Find the value of x, y, z from the following.
x X [ y + (-6)] = [13 X (-19)] + [13 X z]

Answer:-

a x (b+c) = (axb) + (axc)

So, x = 13 , y=19 x=-6


PART – C


III. Write in detail:

17.One day temperature of some cities is given below:

CityMaximum
Temperature
Minimum
Temperature
Ooty 100C-40C
Shimla 50C -90C
Kodaikkanal 110C -30C
Yercaud 120C -20C

From the above table:
(i) Find difference between maximum and minimum temperatures of Kodaikkanal
(ii) Find sum of the highest temperature and lowest temperature among the cities.

Answer:-

i) Difference = 11-3 = 80C

ii) Sum of Temperatures = 120C + (-90C)

= 12-9 = 30C


18.“Integers does not satisfy the associative property with respect to subtraction”.Justifyit.

Answer:-

Can you see that

{[(-2) – (-5)] – 3 } = {(c-2) – [-5-3]}

(-2+5)-3 = -2-(-8)

3-3 = -1+8

0 ≠ 6

Changing the order of integers in subtraction will not give the same value

Hence the associative property does not satisfy over integers with respect to substraction



19. Teacher asked Anjali to subtract (-30) from (-120). She answered immediately -150. Is she correct? What is the correct answer?

Answer:-

(-120)-(-30)
= -120 + 30
= -90
Answer is -90,not -150
So her Answer is In Correct



20.Vandhanawent to a medical shop with Rs.1200. she paid the amount for four different type of tablets, costs Rs.170, Rs.285, Rs.215 and Rs.400 respectively. What is the balance amount she received from the medical shop?

Answer:-

Total Amount = Rs 1200
Cost of Medicines = Rs 170
=Rs 285
=Rs 215
=Rs400
The Balance = 1200-(170+285+215+400)
=1200-1070
=Rs 130
The Ramaining Balance is Rs 130



21.Ramu wrote a competitive examination which has scoring procedure as 2 marks for correct answer and (-1) marks for wrong answers. He had 30 correct answers and 20 wrong answers. How many marks did he score in the examination?

Answer:-

Score for correct answer = +2
Score for wrong answer = -1
Ramu’s Correct answer = 30 x(2)
= +60
Ramu Score wrong answer = 20x(-1)
=-20
The final Score = 60 +(-20)
=(60-20)
=40
40 Marks scored by Ramu in the Examination



PART – D

1.Fill in the value of A,B, C & D by a suitable integer

5+A=0
-1/8XB=1
C+1
0
= 1
0
DX-7= -7

Answer:-

5+-5=0
-1/8X-8=1
0+1
0
= 1
0
1X-7= -7

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