Magic Triangles and Magic Squares

Q.

Which number will come in place of '?' ?

1. 37

Q.
In the above number tower, what are the values of a and b?

1. $a=30,b=20$
2. $a=25,b=15$
3. $a=25,b=20$
4. $a=15,b=25$

Q.
In the above number tower, what are the values of a and b?

1. $a=25,b=20$
2. $a=25,b=15$
3. $a=30,b=20$
4. $a=15,b=25$

Q. Find the difference between the missing numbers in the number tower.


(2 Marks)

1. 15
2. 10
3. 20
4. 12

Q. Which number should come in place of X, to have a constant sum along sides and diagonal?
$\begin{array}{ccc}4& 3& 8\\ 9& \times & 1\\ 2& 7& 6\end{array}$

1. 4
2. 5
3. 3
4. 6

Q.
In the above number tower, what are the values of a and b?

1. $a=25,b=20$
2. $a=25,b=15$
3. $a=30,b=20$
4. $a=15,b=25$

Q.

Which pattern does this sequence follow: 1, 4, 9, 16, 25…?

1. Square number pattern
2. Pentagonal number pattern
3. Hexagonal number pattern
4. Triangle number pattern

Q. By marking the distance, find the radius of the circle if the side of the square is 4 cm.

Q. Find the next number of the pattern?

1. 986
2. 486
3. 575
4. 586

Q.

Which number will come in place of '?'.

1. 36

2. 37

3. 44

4. 45

Q. Does "100." have 3 significant figures?

Q.

Which number will come in place of '?' ?

1. 37

Q.
In the above number tower, what are the values of a and b?

1. $a=25,b=15$
2. $a=25,b=25$
3. $a=35,b=15$
4. $a=15,b=10$

Q. At what time between 5:30 and 6 will the hands of a clock be at right angles?
(A) 43 5 min.past5
11
(B) 43 7 min.past5
11
(C) 40min.past5 (D) 45 min past 5

Q. Find out which of the following sentences are statements and which are not. Justify your answer.
(i) Listen to me, Ravi !
(ii) Every set is a finite set.
(iii) Two non-empty sets have always a non-empty intersection.
(iv) The cat pussy is black.
(v) Are all circles round?
(vi) All triangles have three sides.
(vii) Every rhombus is a square.
(viii) x² + 5 | x | + 6 = 0 has no real roots.
(ix) This sentence is a statement.
(x) Is the earth round?
(xi) Go !
(xii) The real number x is less than 2.
(xiii) There are 35 days in a month.
(xiv) Mathematics is difficult.
(xv) All real numbers are complex numbers.
(xvi) The product of (−1) and 8 is 8.