1.) Square of 79 has _____ in unit place.
2.) Square of 85 has _____ in unit place.
Answers
Answer:
— If a perfect square is of n digits, then its square root will have. 2 n digit if n is even or ... Example 2 : Which of the following will have 1 at its units place? (a) 192. ( b) 172.
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Answer:
For solving these you just need to see units place digit.
79 has 9 in unit place.
And 85 has 5 in unit/ones place.
So, here no need of taking out the square of 79.
Unit place has 9 and square of 9 is 81.
Therefore, Square of 79 has 1 in unit place.
Similarly, in second case, square of 5 is 25 so unit place of square of 85 is 5.
Therefore answers,
1. 1 is the answer
2. 5 is the answer.
Hope u understood.
If you wish, you can try a similar question given here
Square of 124 has _____ in unit place.
Unit place is 4
Square of 4 is 16
Unit place of 16 is 6
Hence answer is 6.