**
select the correct answer from each drop-down menu.
och
in the figure, cdef and ab - ce. complete the statements to prove that ab-df.
cd + de = ef+ de by the
property of equality.
ce = cd + de and df= ef + de by
ce = df by the
property of equality.
given, ab = ce and ce = dfimplies ab dfby the
property of equality.
reset
next

The first step in estimating a sum or a difference is to round the numbers, by changing them to the nearest power of ten, hundred, thousand, etc. Round the numbers first, then use mental math to estimate an answer. When rounding, follow these rounding rules: If the number being rounded is less than 5, round down.

Step-by-step explanation: