Multiply by Divide Math sheet:
1. Print out blank copy (page attached below)
2. Observe sample data chart – use numbers if you are missing
samples!!!!
3. Study teacher calculations
4. Use a blank piece of paper and do the following
a. trace a circle (any can will do)
b. mark the approximate center of circle using ruler
c. draw the starting line
5. Students fill out individual data chart & math sheet
6. Use math sheet to make a pie graph:
Sample data chart (students have their charts glued into page 81)
**STUDENTS with NO data may copy sample 2 or 3 if needed –
PLEASE DO NOT CHANGE your numbers – they ARE CORRECT!!!!
Stage of Cell 1st sample
Cycle
Interphase
84
2nd sample
3rd sample
262
234
Total
number
580
M1:
Prophase
M2:
Metaphase
M3:
Anaphase
M4:
Telophase
Total # of
cells
counted:
12
19
7
2
6
3
3
2
5
7
4
10
293
660
Data Analysis: Multiplying by Dividing
Pie Graph instructions:
a. The math: Use the following equation to figure out the % of cells in each of the following
stages/phases: Interphase, Prophase, Metaphase, Anaphase, Telophase
Total of 1st sample + 2nd sample + 3rd sample in stage/phase
Total of all cells in all 5 stages
x 100 = % of cells in stage
Ex. Interphase 1st sample = 10 in interphase 2nd sample = 9 in Interphase
(32 = total cells in interphase)
3rd sample = 13 in interphase
Interphase total = 32/ prophase = 3/metaphase = 5/ anaphase =6 / telophase = 4
(total of 50 cells counted in all of the stages/phases)
32 cells in interphase
50 cells all together
x 100
= 64% of the cells in interphase
b. The graph: 100% of a circle is 360° of that circle. 50% of a circle would be half of that = 180°. 25%
of a circle would be equal to 90°. Use the following equation to calculate the number of degrees of the
circle that is needed to represent the percent of cells at each stage:
360° x ____ % of cells(hit the % key) = the total number of degrees needed in the pie graph
360° x 64% = 230.4 ° of total circle = Interphase
Compilation of the data: What % of cells are in each stage at a given time?
Column #1:
Stage name:
Column #2 (letter a):
1st sample + 2nd sample + 3rd sample
In stage______________
Total of all cells in all 5 stages
Interphase
84 + 262 + 234 =580 x 100 = 87.9%
660
Prophase
12 + 19 + 7 =38
660
x 100
Column #3 (letter b):
# of degrees needed in pie
graph (instruction # 2)
x 100%
360° x ____ % (hit % key)
*use % from column 2
360° X 87.9% = 316.4°
360° x 5.76% = 20.7°
= 5.76%
Metaphase
2 + 6 + 3 = 11 x 100 = 1.67 %
660
360° x 1.67% = 6.0°
Anaphase
3 + 2 + 5 = 10 x 100 = 1.52 %
660
360° x 1.52% = 5.5°
Telophase
7 + 4 + 10 = 21 x 100 = 3.18 %
660
360° x 3.18% = 11.4°
Data Analysis: Multiplying by Dividing
Pie Graph instructions:
a. The math: Use the following equation to figure out the % of cells in each of the following
stages/phases: Interphase, Prophase, Metaphase, Anaphase, Telophase
Total of 1st sample + 2nd sample + 3rd sample in stage/phase
Total of all cells in all 5 stages
x 100 = % of cells in stage
Ex. Interphase 1st sample = 10 in interphase 2nd sample = 9 in Interphase
(32 = total cells in interphase)
3rd sample = 13 in interphase
Interphase total = 32/ prophase = 3/metaphase = 5/ anaphase =6 / telophase = 4
(total of 50 cells counted in all of the stages/phases)
32 cells in interphase
50 cells all together
x 100
= 64% of the cells in interphase
b. The graph: 100% of a circle is 360° of that circle. 50% of a circle would be half of that = 180°. 25%
of a circle would be equal to 90°. Use the following equation to calculate the number of degrees of the
circle that is needed to represent the percent of cells at each stage:
360° x ____ % of cells(hit the % key) = the total number of degrees needed in the pie graph
360° x 64% = 230.4 ° of total circle = Interphase
Compilation of the data: What % of cells are in each stage at a given time?
Column #1:
Stage name:
Column #2 (letter a):
1st sample + 2nd sample + 3rd sample
In stage______________
Total of all cells in all 5 stages
Column #3 (letter b):
# of degrees needed in pie
graph (instruction # 2)
x 100%
360° x ____ % (hit % key)
*use % from column 2
Interphase
Prophase
Metaphase
Anaphase
Telophase