which of the following numbers would have digit 1 at its unit's place while squaring the following numbers
a) 11 b) 35 c) 49 d) 51
e) 66 f) 79 g) 81 h) 95
Answers
the answer of this question is a,d and g option
Concept:
The square of the digit at the unit's place of a number can determine the digit at the unit's place after squaring the whole number.
Given:
Some numbers are given as 11, 35, 49, 51, 66, 79, 81, 95.
Find:
It is to be determined which of the given numbers will have 1 at their unit's place after squaring.
Solution:
Take the unit's digit of all the numbers and square them.
a) 11
The unit's digit is 1 and its square is 1.
b) 35
The unit's digit is 5 and its square is 25.
c) 49
The unit's digit is 9 and its square is 81.
d) 51
The unit's digit is 1 and its square is 1.
e) 66
The unit's digit is 6 and its square is 36.
f) 79
The unit's digit is 9 and its square is 81.
g) 81
The unit's digit is 1 and its square is 1.
h) 95
The unit's digit is 5 and its square is 25.
Hence, the numbers a) 11, c) 49, d) 51, f) 79, g) 81 have 1 at their unit's place after squaring.
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