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Multiply the product 103*97 in your head.

 Jul 6, 2020
 #1
avatar+782 
+1

103*97=103(100-3)=10300-309=9991.

 Jul 6, 2020
 #2
avatar+10028 
0

Multiply the product 103*97 in your head.

 

Hello Guest!

 

\((a+b)(a-b)=a^2-b^2\)

 

\((100+3)\times (100-3)=10000-9=9991\)

 

This can easily be calculated in the head.

laugh  !

 Jul 6, 2020
 #3
avatar+1128 
+3

so it becomes 100*97+3*97=9700+97+97+97=9700+291=9911

 Jul 6, 2020

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