carroll county middle school
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Carroll County Middle School
October 23, 2009
Math Department Professional Development
1. There are 600 school children in the Lakeville district. If 54 of them are high school seniors, what is the percentage of high school seniors in the Lakeville district?
A. 2.32%B. 0.9%C. 9%D. 11%E. 90%
What are the three types of percentage problems your students will see?
2. Susan’s take-home pay is $300 per week, of which she spends $80 on food and
$150 on rent. What fraction of her take-home pay does she spend on food?
A.B.C.D.
E.
154
21
3023
3029
752
What part of this problem will cause students to give a wrong answer?
3. Which of the following expresses the prime factorization of 54?
A. 9 x 6
B. 3 x 3 x 6
C. 3 x 3 x 2
D. 3 x 3 x 3 x 2
E. 5.4 x 10
What are the only two possibilities and why?
4. The number 1134 is divisible by all of the following except A. 3
B. 6 C. 9D. 12E. 14
What are some divisibility rules that help you here?
5. When is an integer?
A. Only when a is negativeB. Only when a is positiveC. Only when a is oddD. Only when a equals 0E. Only when a is even
211 a
A calculator would help students working the last problem.
True
False
6. On Friday, Jane does one-third of her homework. On Saturday, she does one-sixth of the remainder. What fraction of her homework is still left to be done?
A.B.C.D.E.
2194
95
65
127
What is it about this problem that assures lots of incorrect
answers?
7. If the area of circle A is 16π, then what is the circumference of circle B if its radius is one-half
that of circle A?A. 2πB. 4πC. 6πD. 8πE. 16π
What percentage of your students will correctly answer that geometry
problem?
Geogebra
Installation: www.geogebra.org Download Run, and follow instructions from there
Open Geogebra from your desktop Go to Help, then Geogebra Wiki Choose English, then Middle School
Geometry Formulas
Take a Break
TI-73 APPS•AreaForm•NumLine•Rrampage•GEOBOARD
Let’s Eat
Multiplication & DivisionGames
Prancer and Arnie
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