Find 51 • 49 using mental math.

2491

2499

2009

2509

51

49

x___

  459

2040<--- add zero place holder

+

  2499 is your 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

well what you have to do is divide 84 by 6 so theanswer

step-by-step explanation:

84 divided by 6 = 14

and that lightbulb changing party must be freaking lit!