Q2 of 239 Page 29

Write down the unit digits of the following:

272

27 × 27


Let us only consider the unit’s digits of 27, which is 7.


7 × 7 = 49, which has 9 in its unit’s place.


This number is retained in the unit’s place when the digit is squared.


Hence the answer is 9.


More from this chapter

All 239 →
1

Just observe the unit digits and state which of the following are not perfect squares.

i. 3136


ii. 3722


iii. 9348


iv. 2304


v. 8343

 2

Write down the unit digits of the following:

782

 2

Write down the unit digits of the following:

412

 2

Write down the unit digits of the following:

352