Question

Find the value of each of the following using the diagonal method:
1. $(67{)}^2$
2. $(86{)}^2$
3. $(137{)}^2$
4. $(256{)}^2$

Answer 1

1. $(67{)}^2=4489$



2. $(86{)}^2=7396$



3. $(137{)}^2=18769$



4. $(256{)}^2=65536$