By the unit-digit rule, the square of a number ending in 5 always ends…

Question

By the unit-digit rule, the square of a number ending in 5 always ends in:

Accepted Answer

B. {'text': '5'}

1. The unit digit of a square is determined by the unit digit of the base.
2. If the base ends in 5, the unit digit of its square is 5 × 5's unit digit = 25 → 5.
3. Examples: 15² = 225, 25² = 625, 35² = 1225 — all end in 5.
4. Hence the unit digit is **5**.
_Source: Selina Concise ICSE Class 8 Mathematics Ch 3 "Squares and Square Roots", Unit digit rules_

Answer

{'text': '0'}

Answer

{'text': '1'}

Answer

{'text': '6'}