Seventh Grade Math

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Seventh Grade Math

• Problem 1.2

2
The Final Track Meet Results in the 100 meter
dash in alphabetical order were Adams 9.81 ,
Coffey 10 , Henderson 9.439 , Johnson 9.732 ,
Michaels 9.38 , Samuels 9.5 , Thomas 9.442
and Watson 9.4 (seconds).
1) Rank the order in which they finished and
ready it for the newspaper by rounding off the
times to the hundredths place.
2) The average time for the past three years
have been 9.645 , 9.623 and 9.608 seconds.
The meet officials noticed an improvement every
year and want to know if the trend continued this
year. How should they find their answer?
3
2
9
11
Family Room
Kitchen
2
2
Dining Room
Hansons Dream House
The Hansons want to put wood flooring in the
Kitchen area and carpet the family room and the
dining room. How many square feet of wood
flooring will they need? How many yards (Sq yds)
will they need?
4
Market Cost
Ham 2.43 / lb Steak
3.65 / lb Chicken 1.78 / lb
You own a restaurant and on Tuesday night, you
cooked 45 pounds of ham, 60 ½ pounds of steak
and 80 ¾ pounds of chicken. How many total
pounds of meat did you serve? Excluding meat,
your other costs totaled 723.83 and your
income for the evening was 2190.46, what was
your profit for the evening?
5
Like it or not, fractions and decimals are a part
of life. Remember, unless you die on your
birthday, life does not come out even.
Yes calculators make life easier, but we still
need to be able to do these calculations with
pencil and paper.
Today, well solve the Track Problem.
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The Final Track Meet Results in the 100 meter
dash in alphabetical order were Adams 9.81 ,
Coffey 10 , Henderson 9.439 , Johnson 9.732 ,
Michaels 9.38 , Samuels 9.5 , Thomas 9.442
and Watson 9.4 (seconds).
1) Rank the order in which they finished and
ready it for the newspaper by rounding off the
times to the hundredths place.
2) The average time for the past three years
have been 9.645 , 9.623 and 9.608 seconds.
The meet officials noticed an improvement every
year and want to know if the trend continued this
year. How should they find their answer?
7
Ordering decimals
Align decimal points and add zeros
Now we can compare apples to apples.
1) 2) 3) 4) 5) 6) 7) 8)

9.810 10.000 9.439 9.735 9.380
9.500 9.442 9.400
Adams 9.81
Coffey 10
Henderson 9.439
Johnson 9.735
Michaels 9.38
Samuels 9.5
Thomas 9.442
Watson 9.4
8
When the officials send the result to the
newspaper, they will round the times off to the
nearest hundredth. What would the results look
like?
1) 2) 3) 4) 5) 6) 7) 8)
Michaels 9.38

Watson 9.4
0
Someone reading the paper might think that
Henderson and Thomas tied. How would you answer
them?
Henderson
9.439
9.44
Thomas
9.442
9.44
Samuels 9.5
0
Johnson
9.735
9.74
Adams 9.81
Coffey 10
.00
9
Find the average time.
2
1
3
9.810 10.000 9.439 9.735
9.380 9.500 9.442 9.400
Align decimal points again.

Adams 9.81
Coffey 10
Henderson 9.439
Johnson 9.735
Michaels 9.38
6
7
0
76.
Samuels 9.5
Thomas 9.442
Watson 9.4
10
Average Divide the decimal sum by the whole
number 8 .
9
5
8
8
.
6
7
0
72
Round 9.588 off to the nearest hundredth for the
paper
4
40
7
64
6
9.59 seconds
64
2
The average time for the past three years have
been 9.645 , 9.623 and 9.608 seconds.
Better?
Yes