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Strategies

Practice

MENTAL CALCULATION STRATEGIES

111... squared
\[ 1^2 = 1 \]\[ 11^2 = 121 \]\[ 111^2 = 12321 \]\[ 1111^2 = 1234321 \]\[ 11111^2 = 123454321 \]\[ 111111^2 = 12345654321 \]\[ 1111111^2 = 1234567654321 \]\[ 11111111^2 = 123456787654321 \]\[ 111111111^2 = 12345678987654321 \]