7th Standard Syllabus & Materials
7th Standard
TN 7th Tamil பருவம் -1 இயல் 1 - அமுதத்தமிழ் - ஒன்றல்ல இரண்டல்ல Important Questions And Answers Study Material - QB365 Set A
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Published on: 25/09/2019
Number System
Download Tamil Nadu 7th Standard Maths question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Maths Test1.
Each day, the workers drill down 22 feet further until they hit a pool of water. If the water is at 110 feet, on which day will they hit the pool of water?
2.
Are (–42) x (–7) and (–7) x (–42) equal? Mention the property.
3.
Find the value of :
(i) (-35)\(\times \) (-11)
(ii) 96\(\times \)(-20)
(iii) (-5)\(\times \)12
(iv) 15\(\times \) 5
(v) 999\(\times \)0
4.
Kabilan was having 10 pencils with him. He gave 2 pencils to Senthil and 3 to Karthik. Next day his father gave him 6 more pencils, from that he gave 8 to his sister. How many pencils are left with him?
5.
From the ground floor a man went up six floors and came down six floors. In which floor is he now?
6.
Add:
(i) (–70) and (–12)
(ii) 103 and 39.
7.
(−125) + 25 = −100
8.
The product of two negative integers is a positive integer
9.
8 x (−4) = 32
10.
15 - (-18) is the same as 15 + 18
11.
The additive inverse of (–32) is (–32)
12.
A shopkeeper earns a profit of Rs. 5 by selling one notebook and incurs a loss of Rs. 2 per pen while selling of his old stock. In a particular day he earns neither profit nor loss. If he sold 20 notebooks, how many pens did he sell?
13.
Check the following for equality and if they are equal, mention the property.
(i) (8 - 13) x 7 and 9-(13 x 7)
(ii) [(-6) - (+8)] x (−4) and (-6)- [8(−4)]
(iii)3 x [(-4) + (-10)] and [3 x (-4) + 3 x (-10)]
14.
Subtract the following using the number line.
(i) –3 – (–2)
(ii) +6 – (–5)
15.
Add the following
(i) 8 and –12 using number line
(ii) (–3) and (–5) using number line
(iii) (-100 + (-10)
(iv) 20 + (-72)
(v) 82 + (-75)
(vi) -48 + (-15)
(vii) -225 + (-63)
16.
The set of integers is not closed under
Addition
Subtraction
Multiplication
Division
17.
11 x (–1) = _____
-1
0
+1
–11
18.
20 + (-9) + (9)
20
29
11
38
19.
The temperature at 12 noon at a certain place was 18° above zero. If it decreases at the rate of 3° per hour at what time it would be 12° below zero?
12 mid night
12 noon
10 am
10 pm
20.
(-400) divided into 10 equal parts gives _____.
21.
Given 168 x 32 = 5376 then, find (−5376) ÷ (-32).
22.
When Kala woke up, her body temperature was 102°F. She took medicine for fever. After 2 hours it was 2°F lower. What was her temperature then?
23.
171+____=0
24.
(-5) + ____ = -100
25.
_____\(\times \) (-9) = -45
26.
(-10)\(\times \) __ = 20
1.
Depth drilled in one day = –22 feet
Depth of water = –110 feet
Number of days required = –110 ÷ –22 = 5
Hence the workers wil reach resource in 5 days.
2.
Consider, (–42) x (–7), (–42) x (–7) = +294
Consider, (–7) x (–42), (–7) x (–42) = +294
Therefore, (–42) x (–7) and (–7) x (–42) are equal.
It is commutative.
3.
(i) (–35) x (–11) = 385
(ii) 96 x (–20) = – 1920
(iii) (–5) x 12 = –60
(iv) 15 x 5 = 75
(v) 999 x 0 = 0
4.
Pencils received : (+)
Number of pencils Kabilan has = 10
Number of pencils father gove = 6
= 16
Pencils given : (-)
Number of pencils gave to Senthil = 2
Number of pencils gave to Karthick = 3
Number of penciis gave to Sister = 8
= 13
Number of pencils left = Received - Given
= 16-13
Number of pencils left = 3
5.
Starting point = Ground floor
Number of floors climbed up = +6
Number of floors climbed down = –6
Now the landing point = +6 – 6 = 0 (ground floor)
6.
(i) (–70) + (–12) = –70 – 12 = – 82
(ii) 103 + 39 = 142
7.
(a)
8.
(a)
9.
(b)
10.
(a)
11.
(b)
12.
Since neither profit nor loss
Profit + Loss = 0
(ie) profit = -Loss
Profit earned from 1 notebook = Rs. 5
Profit earned from 20 notebooks = 20 x Rs. 5
= Rs. 100
Loss incurred by selling pens = Rs. 100 Loss
= −100
Loss for 1 pen = Rs. 2
loss = −2
Total number of pens sold = (−100) ÷ (−2)
= 50 pens.
13.
(i) Consider (8 - 13) x 7 = (-5)7 = -35
Now 8 - (13 x 7)
= 8 - 91 = -83
They are not equal.
(ii) [(-6) - (+8)] x (-4)
Now (-6) - [8 x (-4)] = (-6) - (-32)
= (-6) + (+32) = +26
They are not equal.
(iii) Consider 3 x [(-4) + (-10)] = 3 x -14 = -42
Now [3 x (-4) + 3 x (-10)] = (-12) + (-30) = -42
They are equal.
It is the distributive property of multiplication over addition
14.
(i) –3 – (–2)
To subtract –2 from –3 using number line,
Therefore, –3 – (–2) = –3 + 2 = –1
(ii) +6 – (–5)
To subtract –5 from 6 using number line,
.JPG)
Therefore, +6 – (–5) = +6 + 5 = 11.
Now, let us see how to subtract negative integers using additive inverse.
15.
(i)
∴. 8 + (-12) = -4
(ii)
∴ (-3) + (-5) = -8
(iii) (-100) + (-10) = -100-10 = -110
(iv) 20 + (-72) = 20 - 72 = -52
(v) 82 + (-75) = 82 - 75 = 7
(vi) -48 + (-15) = -48 - 15 =- 63
(vii) -225 + (-63) = 225 - 63 = -288
16.
(d)
Division
17.
(d)
–11
18.
(a)
20
19.
(d)
10 pm
20.
\(\frac{-400}{10}=-40\)
21.
Given 168 x 32 = 5376
\(\frac{-5376}{-32}=\frac{-(168 \times 32)}{-32}=168\)
22.
Kala's bodytemperature when woke up = 102o F
After 2 hours then taking medicine her
temperature lowered by (-) = -2oF
Then her temperature = 102o - 2o
= 100oF
Her body temperature was 100oF
23.
( )
-171
24.
( )
-95
25.
( )
5
26.
( )
-2
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Tamilnadu Stateboard 7th Standard Subjects
Tamilnadu Stateboard Standards
