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Which of the following is a perfect square number?
The answer is 1681 because it is the only number which has it's last digit as a number which a perfect square can have . 9×9=81 the last digit is 1.
Option B is correct because the unit digit of 161 is 1 and if unit digit of any digit ends with 1 the its square will also end with 1.
Here, we have to find the sum of first five odd natural numbers.
Therefore, 1 + 3 + 5 + 7 + 9 = (5)2 = 25
Find the smallest whole number by which 1008 should be multiplied to get a perfect square number .
The smallest whole number is 7, by which 1008 should be multiplied so as to get a perfect square.
Now 1008×7= 7056
=2×2×2×2×3×3×7×7
So, the square root will be =2×2×3×7 = 84
When a square number ends in _______, the number whose square it is, will have either 4 or 6 in unit’s place.
Answer is 6 because the last digit of the square of 4 is 6 and 4 is also 6.
Sum of squares of two numbers is 145. If square root of one number is 3, find the other number.
Find the perfect square numbers between 30 and 40.
Since, 1 x 1 = 1
2 x 2 = 4
3 x 3 = 9
4 x 4 = 16
5 x 5 = 25
6 x 6 = 36
7 x 7 = 49
Thus, 36 is a perfact square number between 30 and 40.
All square numbers end with __________ at unit’s place.
The numbers ending with 0 gives 0,numbers ending with 1,9 gives 1, numbers ending with 2,8 gives 4, numbers ending with 3,7 gives 9, numbers ending with 5 gives 5 and numbers ending with 4,6 gives 6. Hence we get only 0,1,4,5,6,9 at the unit's place.
Without doing any calculation, find the numbers which are surely perfect squares.
The perfect squares have 0,1,2,4,5,6 or 9 at their units place.
Therefore153,257 and 408 are surely not perfect squares.
How many numbers lie between square of 12 and 13
12^{2} = 12*12 = 144
13^{2} = 13*13 = 169
Now numbers are between144 and 169 are:
145, 146, 147,.............168
Total number = 24
So total numbers lies between 144 and 169 is 24
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