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NISA [10]
3 years ago
15

Find 51 • 49 using mental math. 2491 2499 2009 2509

Mathematics
2 answers:
Brut [27]3 years ago
7 0

Answer:

  51

  49

x____

459

2040<--- add zero place holder

+______

2499 is your answer

irga5000 [103]3 years ago
6 0

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

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