posted by Jessica
Please I just need help on the set up teacher wants a guess and check table.
Thomas is thinking of a number. If he doubles his number and subtraction 27, the results is 407. Of what number is Thomas thinking?
So we know that the result of doubling a number and subtracting 27 gives 407. Since your teacher wants a guess and check table, let's just start guessing numbers around the 200 mark, since we know double the number at some point.
no need for guessing, just reverse the steps:
the first thing we did was multiply by 2, then subtract 27 to get 407
So everything done in reverse:
( 407+27) divide by 2
= 434 ÷ 2