I think I fail to understand this report as the math are not making sense:
Keyword Tool: 260 searches in broad mach , 210 in phrase match, 170 in exact match.
How is it possible to get 320 impressions on the same Query.
There are way more impressions than searches for that specific query. Thats nonsens!
From Google Support- definition of query:
| Query | Only used in the SEO reports. Applies to the actual query entered by a user in Google search. | The actual query entered by a user in Google search. |