Explain how you can find 4 x 754 using two different methods for 4th graders

Solution :- To find 4 x 754 using two different methods ,we have two methods

Method 1 :-  4 x 754

=4(700+50+4)  

=4 x 700 + 4 x 50 +4 x 4    [By using distributive property]

= 2800 + 200 +16

= 3016 Ans

Method 2 :- 4 x 754

=4(750+4)    

= 4( (5 x 150 )+4)

=4 x 5 x 150 + 4 x 4 [By using distributive property]

=(4 x 5) x 150 + 4 x 4 [associative property]

= 20 x 150+16

=3000+16

=3016 Ans

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)