Mark and robyn use base-ten blocks to show the 200 is 100 times as much as 2. whose model makes sense? whose model makes nonsense? explain your reasoning

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.

Carlos spent 1 1/4 hours doing his math homework he spent 1/4 of his time practicing his multiplication facts how many hours to carlos been practicing his multiplication facts

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25