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 .

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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?

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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

    +

    +

    + =