Multiplication Tricks (6)

Algebra Level 1

Find the value of

21 2 \large { 21 }^{ 2 }


Try without the use of a calculator

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The answer is 441.

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1 solution

Zee Ell
Nov 2, 2016

2 1 2 = ( 20 + 1 ) 2 = 2 0 2 + 2 × 1 × 20 + 1 2 = 400 + 40 + 1 = 441 21^2 = (20 + 1)^2 = 20^2 + 2×1×20 + 1^2 = 400 + 40 + 1 = \boxed {441}

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