Question

lesson check (sabis) 1. a chess - board has 64 squares. at a chess tournament 84 chess - boards were used. how many squares are there on 84 chess - boards?

Explanation:

Step1: Identify the operation

We need to multiply the number of squares per chess - board by the number of chess - boards.
$64\times84$

Step2: Perform the multiplication

$64\times84=(60 + 4)\times(80+4)=60\times80+60\times4+4\times80+4\times4$
$=4800+240 + 320+16$
$=4800+(240+320)+16$
$=4800 + 560+16$
$=5360+16$
$=5376$

Answer:

5376