The unit digit of 47² is:
A{'text': '3'}
B{'text': '6'}
C{'text': '9'}
D{'text': '1'}
Answer & Solution
Correct answer: C. {'text': '9'}
1. The unit digit of a square is determined by the unit digit of the base.
2. Unit digit of 47 is 7; 7 × 7 = 49 → unit digit 9.
3. Verification: 47² = 2209, which ends in 9 ✓.
4. Hence the unit digit is **9**.
_Source: Selina Concise ICSE Class 8 Mathematics Ch 3 "Squares and Square Roots", Unit digit rules_
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