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8/6/2019 Mental Sums for Dtert May 2011- r Athmaraman
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2 lines of symmetry.
How many lines of symmetry does this figure
have?
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How many polygons are there in this
figure?
There are 4 polygons in this figure.
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A rectangle C is cut into equalrectangles
A and B as follows:
C BAC
20cm
10
c m
Find the perimeter of rectangle A .
8/6/2019 Mental Sums for Dtert May 2011- r Athmaraman
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Here is a bill
Find out at least one error inthe bill.
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Your teacher asks you to construct a
six digit
number with the following
properties:
a) All the digits are different.
b) It should be exactly divisible by
8.
c) It should be as large as possible.
The 6-digit number is 987640 .
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In this division method to find LCM, the
number to divide next is?
3
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The rectangle is divided into 24 equal
parts.The fraction showing the shaded parts is______.
9 3
30 10or
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M and N are the midpoints of the sides AB, ACrespectively.
Then, what fraction of ABC is the shadedportion?
8/6/2019 Mental Sums for Dtert May 2011- r Athmaraman
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The denominator of the fraction form of Bshows
9.5 9.6
B
955
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The angles between the
hands of the traffic police man is
_________.
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In the given figure, do the two lines AB and CD
intersect?
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The area of the closed figure (as shown) is __
square units .
7
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The bar graph shows that the village ______ has a
population of about 2500 people.
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The number of students who like cricket
exceeds
the number of students who like hockey
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What number is in thebox?
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How many cubes arethere?
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This stairway is made of cubes.
How many cubes would be needed to
make the steps 9 steps high?
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The shapes that are congruent are_____________.
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If the net shown is folded to make
a cube, which letter is opposite X?
A X B
E
C D
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A 6 by 8 and a 7 by 9 rectangle overlap with one
corner coinciding as shown. What is the area ( in
square units) of the region outside the overlap?
7
6
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You are given the BACK VIEW
of a building .BACK VIEW
AB C
D
E
Find the FRONT VIEW.
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Which of the buildings below would falldownif we tried to make them?
DC
A
B
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M a d u
r a
i
Saira drove from Salem to Madurai.
The graph charts her progress.
a) How long did the journey take?b) When did she stop for lunch?c) How far was she from Madurai then?d) The speed limit 70 Km/h. Did sheexceed it?
If so when.
S a l e m
200160
120
80
40
0
10.00
11.00
12.00
13.00
14.00
Distanc
e
( k m
)
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0
20
40
60
80
100
2 4 6 8 10 12 14 16 18 20 22Distan ce
(me tres)
Time (seconds)
Who came first in the race?Who came last in the race?Who started out the fastest?When did Bhuvan cross Arjun?
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If 3 = 11
and
2 4 = 15,
what is
4 10 ?
x y
x y
x y
+
+
+ =