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Ans 1: (Master Answer)
Class : Class 1
Here, the answer is A.
7 tenths is 7 over 10, if you divide 7 by 10 you get 7 tenths as a decimal which is 0.7
Similarly, 45 tenths is 45 over 10,if you divide 45 by 10 you get 45 tenths as a decimal which is 4.50
21 hundredths is 21 over 100, if you divide 21 by 100 you get 21 hundredths as a decimal which is 0.21
Hence, the sum of 7 tenths, 21 hundredths and 45 tenths is (0.7 + 0.21 + 4.50) = 5.41
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Ans 1:
Class : Class 9
This question is completely wrong as when we factorise (a^2-13a 30) and (a^2 4a 4), we get (a-3)(a-10) and (a 2)^2 respectively. After calculating more, we get a-3=a 2 which has no solution as -3≠2
Ans 4:
Class : Class 9
a2 - 13a + 30 = a2 + 4a + 4
a - 10 a + 2
=> (a2 - 13a + 30)(a + 2) = (a2 + 4a + 4)(a - 10)
=> a3 + 2a2 - 13a2 - 26a + 30a + 60 = a3 - 10a2 +4a2 + 4a - 40
=> - 11a2 + 4a + 60 = - 6a2+ 4a - 40
=> - 11a2 + 6a2 + 60 + 40 = 0
=> - 5a2 + 100 = 0
=> 5a2 = 100
=> a2 = 20
=> a = √20
Insert the value of'a'and you will get the answer.
Ans 6:
Class : Class 8
By factorization process, we get a-3 = a 2, which is in fact a linear equation without a solution. On the other hand, by solving through cross multiplication method (as shown in the solution of this question), we get a²-8a-20 = 0, or (a 2)(a-10) = 0. By solving the quadratic equation, we get a as (-2) or (10), which, upon substituting in the formula given in the question, doesn't satisfy the equation. This is because the equation in the above question isn't even actually correct, as (a-3) is not equal to (a 2), as that would lead to the statement: 5 = 0, which is obviously not true.
Ans 8:
Class : Class 10
The question is wrong.If A is the answer, solving this quadratic eqn, we get a=10 or -2since the answer is a simplified form of the question, these values of a should also hold for question also. But if we put these vales in the question either LHS or RHS denominator will become 0 making it undefined.the actual procedure is to factorize.=> [(a-3)(a-10)]/(a-10)=[(a 2)(a 2)]/(a 2)=> a-3 = a 2=> -3 = 2 which is absurd. so the question is wrong.
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Match the following.
Column 1----------Column 2
| (i) | 926543 | (p) | Smallest 5-digit number |
| (ii) | 10000 | (q) | Place value of 2 is 2000 |
| (iii) | 962540 | (r) | 100039 when rounded off to nearest 100 |
| (iv) | 100000 | (s) | Successor of 926542 |
A (i) - (s), (ii) - (p), (iii) - (q), (iv) - (r)
B (i) - (q), (ii) - (r), (iii) - (s), (iv) - (p)
C (i) - (s), (ii) - (r), (iii) - (q), (iv) - (p)
D (i) - (q), (ii) - (p), (iii) - (s), (iv) - (r)
rd
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turn to his right and then 
turn in clockwise direction. Now, if he wants to face towards the book store, then what turn will he make from the given options?
turn anticlockwise
turn clockwise
turn towards right
turn towards left
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Fill in the blanks.
(i) The additive identity of the integers is P.
(ii) The integer which is 8 less than - 24 is Q.
(iii) Every integer less than zero is R.
| P | Q | R | |
| A | 0 | - 32 | negative |
| B | 1 | - 32 | positive |
| C | 0 | - 16 | negative |
| D | 1 | - 32 | negative |
how is the answer a? its supposed to be c right?
Ans 10:
Class : Class 6
The correct answer is c as -16 is 8 greater than -24. Have you never read integers?.
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