1. Measurement Investigation:
What is the relationship between total finger length and arm
length?
Aim: To Investigate the relationship between finger length and arm length.
Hypothesis: We predict that Grade 4 students’ arm length will be longer than their
total finger length.
Materials:
1 Measuring Tape
1 Pencil
1 Sheet of paper
1 Clipboard
15 Grade 4 Students
Method:
1.Collect your materials.
2.Draw a table of 9 columns (name,1st finger, 2nd finger, 3rd finger, 4th finger,
thumb, total finger length, arm length and difference).
3. Ask someone to spread his/her fingers wide.
4. Start measuring the person’s finger length with the measuring tape from 1st
finger to thumb.
5. Record the length of each finger in the columns.
6. Ask the same person to stretch out their arms and measure their arm length from
arm to wrist.
7. Record the length of their arm on the columns.
8. Then, subtract the total finger length and total arm length to get difference.
9. Lastly, repeat the same steps for the 14 other students.
Results:
Name 1st 2nd 3rd 4th Thumb Total Arm Difference
finger finger finger finger (mm) finger Length
(mm) (mm) (mm) (mm) length (mm)
(mm)
Benedict 45 60 65 65 50 265 415 150
Hanson 50 55 60 52 40 257 430 173
Sarthak 50 60 70 65 40 285 352 133
Sajid 65 60 70 78 63 336 240 96

2. Kazuki 56 61 71 66 50 314 400 86
Joshua 45 61 65 60 50 281 340 59
Geon 50 60 60 60 40 270 450 180
Woo
Annie 40 55 50 50 50 235 440 205
Kaopoon 50 63 70 60 55 395 395 0
Hyun 41 58 60 55 41 255 395 140
Seo
Jermaine 55 65 70 63 55 315 410 150
Diana 50 60 65 60 50 285 410 125
Jack 50 65 70 60 40 285 425 260
Na Youn 50 60 65 60 50 285 400 155
Kota 45 55 60 57 46 283 430 147
Conclusion
13 out of 15 (85%) of people’s arm length is longer than their total finger length.
2 out of 15 (10%) of people’s arm length is shorter than their total finger length.
1 out of 15 (5%) of people’s arm length and total finger length are the same.
On Average, people’s arm length is 10.12 cm longer than their total finger length.
Discussion
Out sample size was only 15 students, aged 9-10 years of age. We would need to
measure more 9-10 year olds to make our data more reliable.
We had difficulties getting the accurate measurements. We didn’t always start on
the zero on the tape because the people is kept on moving their fingers and we
couldn’t keep still. We also found that the people were bending their fingers and we
can’t measure the correct length of their finger length.
We would still be interested to repeat this investigation with people of different
ages to see if there are differences in the data. We would also like to try the
investigations with different kinds of people with different arm length and finger
length.