alleryUsing 23 = 20 + 3, the square of 23 is:
A429
B523
C539
D529
Answer & Solution
Correct answer: D. 529
1. 20 times 23 is 460 and 3 times 23 is 69.
2. Or 400 + 60 + 60 + 9.
3. That gives 529.
_Source: syllabus Mathematics, Chapter 6, Squares and Square Roots._
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