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Kids Maths Puzzles

They are four what are they ?

October 24, 2015 by puzzler 4 Comments

they-are-four-what-are-they

There are four What are they ?

1. having no use Before
2. is the just mirror image of 3rd
4. Is the half of 3rd

[Read more…]

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How many 0’s between 1 to 200

March 9, 2015 by Dilip Lalwani 8 Comments

How many 0’s are present in numbers from 1 to 200 ?

(including both)

Check your answer:-

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Click here to See SolutionHide
One zero after every 10 numbers, thus 20 + 10 extra (for 100’s series, 100, 101 to 109) + 1 extra for 200
Thus total number of zeros between 1 to 200 are 31.

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Solve this number puzzle

February 18, 2015 by dushyant singh 1 Comment

10408086_334897820029319_8703869613996047258_n

Click here to See SolutionHide
If we try to make equations

x1 + x2 + x3 = 9

x4 + x5 + 5 = 12

x7 + x8 + x9 = 7

x1 + x4 + x7 = 6

x2 + x5 + x8 = 9

x3 + 5 + x9 = 13

x1 + x5 + x9 = 5

x7 + x5 + x3 = 11

7 variables and 7 equations, its little tough and cumbersome to solve these equations so lets try some hit and trial.

you can see that x1 + x5 + x9 is only 5, thus it has less number of possibilities for x1, x5 and x9 as these cant be -ve.

lets assume x1 and x9 both are 0, in that case x5 will be 5.

17
0 1 8 9
2 5 5 12
4 3 0 7
——
6 9 13 5

diagonal equation does not satisfy, we can see x7 + x5 + x3 exceeds by 6.
so lets try to reduce it by 6,

lets try by x1 = 1, x9 = 1
11
1 1 7 9
4 3 5 12
1 5 1 7
6 9 13 5

it satisfies all the conditions
so, x1 = 1 , x2 = 1, x3 = 7, x4 = 4, x5 = 3, x7 = 1, x8 =5 and x9 = 1

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1 + 1 + 1 + 1 + 1 90% Fail

January 30, 2015 by puzzler 122 Comments

Number Puzzle #129

1 + 1 + 1 +1 + 1 1 + 1 + 1 + 1 + 1 1 + 1 x 0 + 1 = ?

1 + 1 + 1 +1 + 1
1 + 1 + 1 + 1 + 1
1 + 1 x 0 + 1 = ?

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Was your answer 12 ? Its not correct though.

Actually there is a slight catch, if you see the image properly

it is
1 + 1 + 1 + 1 + 11 + 1 + 1 + 1 + 11 + 1 x 0 + 1
i.e. 4 + 11 + 3 + 11 + 0 + 1 => 30

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? 7 4 1 | ? 8 5 2

November 10, 2014 by puzzler 5 Comments

Kids Math Puzzles #2

? 7 4 1 ? 8 5 2

? 7 4 1
? 8 5 2

What numbers should replace question marks ??

Check your answer:-
First Column

Tried enough already?

Second Column

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Four rivers and three temples

November 5, 2014 by puzzler 6 Comments

Puzzle Time:
Four rivers and three temples

All the rivers are magical, moment a worshiper crosses a river with any number of flowers, it becomes double. (For eg 1 flower becomes 2 flowers, 2 become 4 and so on).

How many minimum number of flowers a worshiper needs 2 carry from beginning such that he offers equal number of flowers in all the three temples, and he is left with zero flowers at the end of fourth river.

Solve this ??

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Lets assume that he offers x flowers at every temple, thus he must have only x flowers left at the end of 3rd temple, otherwise he will not have zero flowers at the end of fourth river.

also we can say that after offering flowers at second temple he should be left with x/2 flowers.
similarly after offering flowers at first temple he should be left with (3x/2)/2 flowers.
Thus he should be carrying (x + 3x/4)/2 flowers initially, i.e. 7x/8 flowers initially.

For number of flowers to be integer, x =8, thus he must carry 7 flowers initially and offer 8 flowers at each temple.

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Solve 36 % 6 x 3 -9 + 1

October 30, 2014 by puzzler 9 Comments

Kids math puzzle #1 36%6*3-9+1 = ?

Kids math puzzle #1
36%6*3-9+1 = ?

Check your answer:-

Tried enough already?



Click here to See Answer with explanationHide

Here as there are no braces, operators will work as per their precedence.
division and multiplication has same precedence and addition and subtraction has same precedence. Also / and * has higher precedence then + and -.
Thus first % and * should operate, now they being of the same precedence, they will work from left to right order thus % will operate first and the * will work on its result.

Thus 36%6*3 -9 +1 => 6*3 -9 +1 => 18 -9 + 1=> 10

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