nicolialcantara141 nicolialcantara141

14-05-2021
Mathematics

contestada

Find 51 • 49 using mental math.

2491

2499

2009

2509

Respuesta :

Аноним Аноним

14-05-2021

Answer:

51

49

x____

459

2040<--- add zero place holder

+______

2499 is your answer

Answer Link

goddessboi goddessboi

14-05-2021

Answer:

2499

Step-by-step explanation:

Here's one mental approach:

51*49

(50+1)(50-1)

(a+b)(a-b)=a²-b²

(50+1)(50-1)=50²-1²

2500-1

2499

Or you could say (51*50)-51 = 2550-51 = 2499

Answer Link

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