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Published on: 16/06/2021
QB365 provides detailed and simple solution for every book back questions in class 7 Maths subject.It will helps to get more idea about question pattern in every book back questions with solution.
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.
Find two consecutive natural numbers whose sum is 75.
2.
Find the value of
(i) 3m + 2n
(ii) 2m − n
(iii) mn − 1, given that m = 2, n = − 1.
3.
If x = 3, y = 2 find the value of
(i) 4x + 7y
(ii) 3x + 2y − 5
(iii) x − y
4.
Find the numerical co-efficient of the following terms. Also, find the co efficient of x and y in each of the term: 3x, - 5xy, - yz, 7xyz, y, 16yx.
5.
Identify the variables, terms and number of terms in each of the following expressions:
(i)12 −x
(ii) 7 + 2y
(iii) 29 + 3x + 5y
(iv) 3x – 5 + 7z
1.
The numbers are natural and consecutive. Let the numbers be x and x + 1.
Given that,
x + (x + 1) = 75
2x + 1 = 75
2x + 1 − 1 = 75 − 1 [Subtract 1 on both sides]
2x + 0 = 74
\(\frac {2x }{2 } =\frac { 74 }{ 2 } \) [Divide 2 at both sides]
x = 37 and x + 1 = 38
Therefore, the required numbers are 37 and 38.
2.
i) 3m + 2n = 3(2) + 2( −1) = 6 −2 = 4
ii) 2m − n = 2(2) − ( −1) = 4 + 1 = 5
iii) mn −1 = (2) ( −1) −1 = −2 −1 = –3
3.
i) 4x + 7y = 4 (3) + 7 (2) = 12 + 14 = 26
ii) 3x + 2y – 5 = 3 (3) + 2 (2) – 5 = 9 + 4 – 5 = 8
iii) x – y = 3 – 2 = 1
4.
| Expression | Numerical co-efficient | Co-efficient of x | Co-efficient of y |
| 3x | 3 | 3 | Not possible |
| -5xy | -5 | -5y | -5x |
| -yz | -1 | Not possible | -Z |
| 7xyz | 7 | 7yz | 7xz |
| y | 1 | Not possible | 1 |
| 16yx | 16 | 16y | 16x |
5.
| S.No | Expressions | Variables | Terms | No. of terms |
| (i) | 12-x | x | 12, -x | 2 |
| (ii) | 7+2y | y | 7, 2y | 2 |
| (iii) | 29 + 3 x+ 5y | x, y | 29, 3x, 5y | 3 |
| (iv) | 3x - 5 + 7z | x, z | 3x, -5, 7z | 3 |
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Tamilnadu Stateboard 7th Standard Subjects
Tamilnadu Stateboard Standards
