Question

1. What will be the units digit of the square of the following numbers (ii) 297 (iii) 5125 (iv) 7280 (1) 39​

Answer 1

Answer:

39

2

=39×39= unit digits of the squares =1

297

2

=297×297= unit digit is 9

5125

2

=5125×5125= unit digit is 5

7286

2

=7286×7286= unit digit is 6

Step-by-step explanation:

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Answer 2

Answer:

(i) 1

(ii) 9

(iii) 5

(iv) 0

Step-by-step explanation:

(i) Units digit of 39 is 9.

9² = 9 × 9 = 81.

So, the units digit of the square of 39 is 1.

(ii) Units digit of 297 is 7

7² = 49.

So, the units digit of the square of 297 is  9.

(iii) Units digit of 5125 is 5.

5² is 25.

So, the units digit of the square of 5125 is 5.

(iv) Units digit of 7280 is 0.

0² is 0.

So, the units digit of the square of 7180 is  0.