write down the larger number.
write the smaller number directly below it.
subtract the number in the ones column of the bottom number from the number in the ones column of the top number.
subtract the number in the tens column of the bottom number from the number in the tens column of the top number.
if you have more columns then continue with this step
*when subtracting you sometimes have to regroup
what is regrouping?
regrouping in math is a term used to describe the process of changing groups of ones into tens to make adding and subtracting easier. in addition, you regroup when the numbers you are adding come out to two digit numbers if they are not in the furthermost left column.
how to regroup:
subtract 1 from the top number in the column directly to the left. cross out the number you're borrowing from, subtract 1, and write the answer above the number you crossed out.
add 10 to the top number in the column you were working in.
6.25 or and estimated answer of 19.625
c = 2r
since 2r = d, the diameter is 5 cm and the radius is 2.5 cm
(d = diameter) (r = radius)
the area of a circle is
so 2.5 squared equals 6.25
the area of this circle is 6.25
or and estimated answer of 19.625
(6.25 times pi)
he has 50 rock songs.
5 + 6 = 11
so the total number of songs is 101 < 11*10 < 120, that is 110.
so he has 50 rock songs and 60 dance songs.