Notice that the unit segment is divided in 8 parts. Then, each mark is equal to 1/8.
The kitten that weighs the most is placed over the 5ft mark. Then, its weight is:
![(5)/(8)](https://img.qammunity.org/2023/formulas/mathematics/high-school/klcv5bp7wr4w088o0hxv4n8wc71h76u6tp.png)
The kitten that weighs the least is placed over the third mark. Then, its weight is:
![(3)/(8)](https://img.qammunity.org/2023/formulas/mathematics/high-school/jmawwmf0f9yc3uuid2tej1hg3vb96xryi0.png)
Substract 3/8 from 5/8 to find the difference on their weights:
![(5)/(8)-(3)/(8)](https://img.qammunity.org/2023/formulas/mathematics/college/loc7np4f5bkw3q64wdi4b748nes7jk14ip.png)
Since both fractions have the same denominator, we can substract their numerators:
![(5)/(8)-(3)/(8)=(5-3)/(8)=(2)/(8)=(2/2)/(8/2)=(1)/(4)](https://img.qammunity.org/2023/formulas/mathematics/college/hmg3q4jjrhu6d9jqh13x02y3i38r7haysz.png)
Therefore, the difference in pounds between the heaviest and the lightest kittens, is:
![(1)/(4)](https://img.qammunity.org/2023/formulas/mathematics/college/nvzx4jpqhp8fdgb8f5vgtifqq8ndmxgctx.png)