- Counting something usually requires seeing that something
- We need a tool to count the legs of an ant
- So, to count the legs of an ant requires seeing the ant

- An insect usually has a small size
- An ant is a kind of insect
- So, an ant is small in size

- An ant is small in size
- Seeing small things is difficult
- So, seeing an ant is difficult because an ant is small in size

- Seeing an ant is difficult because an ant is small in size
- Magnifying glass is used to see small things by making objects appear bigger
- So, magnifying glass can be used to see an ant by making it appear bigger

- To count the legs of an ant requires seeing the ant
- Magnifying glass can be used to see an ant by making it appear bigger
- So, magnifying glass can be used to count the legs of an ant by making the ant appear bigger

- Magnifying glass can be used to count the legs of an ant by making the ant appear bigger
- A hand lens is a kind of magnifying glass
- Hence, a hand lens can be used to count the legs of an ant

So, a hand lens can be used to count the legs of an ant
Which tool would be best to use for counting the number of legs on an ant?
- Counting something usually requires seeing that something 
- We need a tool to count the legs of an ant 
- A hand lens is a kind of magnifying glass 
- An insect usually has a small size 
- Seeing small things is difficult 
- Magnifying glass is used to see small things by making objects appear bigger 
- An ant is a kind of insect