The document describes an investigation into the relationship between total finger length and arm length in people. The hypothesis is that a person's arm length will be greater than their total finger length. 20 people had their individual finger lengths and arm length measured and recorded. The results found that for 9-12 year olds, most had arm lengths greater than their total finger length, with an average difference of 27cm. The conclusion is that the hypothesis that arm length is greater was supported, but it was noted that a larger sample size would be needed to generalize the findings.

1. Length Investigation
Aim:
To investigate the relationship between a person’s
total finger length and arm length.
Hypothesis:
I predict that a person’s arm length is greater than
their total finger length.
Materials:
Measuring tapes
Paper
Clipboard
Pencil
Rubber
20 people
Method:
1. Measure someone’s thumb finger.
2. Measure their pointing finger.
3. Measure their middle finger.
4. Measure their ring finger.
5. Measure their last finger and little finger.
6. Measure their arm.
7. Record all the results in your table.

2. Results:
Name Finger1 Finger2 Finger3 Finger4 Finger5 Arm Length
Krishna 5.6cm 6cm 7.1cm 6cm 5.2cm 54.1cm
Nina 5cm 6cm 6.5cm 5.8cm 4.4cm 52.5cm
Yen Yen 5cm 6cm 8cm 7cm 6cm 63.5cm
Takumi 5cm 6cm 7cm 6cm 5cm 56cm
Gengrio 5cm 6cm 6.2cm 6cm 4.5cm 53cm
Simon 5cm 6cm 7cm 6cm 5cm 62cm
Alaa 5cm 6cm 6.2cm 5.5cm 5cm 58cm
Qi Qi 5.2cm 5.5cm 6cm 6cm 5cm 62.5cm
Justus 5cm 7cm 7.3cm 6cm 5cm 61cm
Ki Joo 6cm 7cm 8cm 7cm 6cm 60cm
Ki Jung 5cm 6cm 6.5cm 5.5cm 4.5cm 55cm
Hena 5cm 6cm 7cm 5.8cm 4cm 56.5cm
Naina 5cm 5.8cm 7cm 6cm 4.5cm 51cm
Grace 5cm 6cm 7cm 6cm 5cm 65cm
S-C 6cm 7cm 7.5cm 7.3cm 6cm 55cm
Dennis 5cm 6cm 6.5cm 6cm 5cm 54cm
Adam 5cm 6cm 7.2cm 5.7cm 5cm 43cm
Conclusion:
We conclude that at 9-12 years of age, most
children’s arm length is greater than their fingers all
together. The average difference between total finger
length and arm length is 27cm.

3. Discussion:
Our sample length was only 20 people. We would
need more people to be sure about our answers
around the world. We had a few problems measuring
the fingers and the arm. We found it hard to measure
fingers because of their small size.
We are interested to know about their finger and arm
size, as they grow older. It would be interesting to try
these math investigations on other people like adults,
parents, teacher’s, babies’, children, teens, brothers
and sisters to see if age impacts on the results.