Question

Square of 405?
And:
8+5+5+4=
And
1/2×8×5×4=

Answer 1

Hey mate ☺

•

• Square of 405 is 164025

•

• 8+5+5+4 = 22

•

•

$\frac{1}{2} \times 8 \times 5 \times 4 = 4 \times 5 \ \times 4 \\ = 80$

Hope it helps you ☺✌✌

Answer 2

(405)²=(400+5)²='(400)²+5²+2×400×5=160000+25+4000=164025

8+5+5+4=22

1/2×8×5×4=80