Answer

1) 103×97= 9,991

2) 77×83= 6,391

3) 205×195= 39,975

4) 153×147= 22,491

I hope it helps you

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Answer:

Step-by-step explanation:

1) 103×97

(100+3)×(100-3)

(a+b)(a-b) = a²-b²

=100²-3²

=10000-9=9991

2) 77×83

(80-3)×(80+3)

(a+b)-(a-b) = a²-b²

= 80²-3²

= 6400-9

= 6391

3) 205×195

(200+5)×(200-5)

(a+b)-(a-b) = a²-b²

= 200²-5²

= 40000-25

= 39975

4) 153×147

(150+3)×(150-3)

(a+b)(a-b) = a²-b²

= 150²-3²

= 22500-9

= 22491