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Published on: 30/08/2019
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.
Are 3 x [(–4) + 6] and [3 x(–4)] + (3 x 6) equal? Mention the property.
2.
Prove that (–7) x (+8) is an integer and mention the property.
3.
Add
(i) (–40) and (30)
(ii) 60 and (–50)
4.
A student was asked to subtract (–12) from (–47). He got −30.Is he correct? Justify.
5.
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?
6.
The temperature at Srinagar was −3°C on Friday. If the temperature decreases by 1°C next day, then what is the temperature on that day?
7.
Find 5 pairs of integers that add up to 2.
8.
11 x (–1) = _____
-1
0
+1
–11
9.
(-100) - 0 + 100 = _____
200
0
100
-200
10.
(-10) + ( +7)=____
+3
-3
-17
+17
11.
75 + (-25) = __
12.
____ + (-22) = 0
13.
____\(\times \) 75 = 0
14.
The sum of a positive integer and a negative integer is always a positive integer.
15.
(−64) ÷ (-64) is 0
16.
(−30) ÷ (−6) = −6
17.
8 x (−4) = 32
1.
Consider, [3 x (–4) + 6],3 x [(–4) + 6] = 3 x 2 = 6
Consider, [3 x(–4)] + [3 x 6],[3 x(–4)] + [3 x 6] = –12 + 18 = 6
Therefore, [3 x [(–4) + 6] and [3 x (–4)] + 3 x 6 are equal.
It is the distributive property of multiplication over addition.
2.
(–7) x (+8) = (–56)
Hence, –56 is an integer.
Therefore, (–7) x (+8) is closed under multiplicaton.
3.
(i) (–40) and (30)
–40 + 30 = –10
(ii) 60 and (–50)
60 + (–50) = 60 – 50 = 10
4.
-47 -(-12) = -47 + 12 = -35
A student got -35.
No, he is not correct
5.
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
6.
The temperature at Srinagar was −3°C on Friday. If the temperature decreases by 1°C
then, temperature on the next day = −3°C – 1°C = −4°C
7.
Five pairs are :
(0,2) Reason:0 + 2 = 2
(-2,4) Reason:-2 + 4 = 2
(-1,3) Reason:-1 + 3 = 2
(1; 1) Reason:1 + 1 = 2.
(-3,5) Reason -3 + 5 = 2
8.
(d)
–11
9.
(b)
0
10.
(b)
-3
11.
( )
50
12.
( )
22
13.
( )
0
14.
(b)
15.
(b)
16.
(b)
17.
(b)
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Tamilnadu Stateboard 7th Standard Subjects
Tamilnadu Stateboard Standards
