Road Tyres on Mountain Bike

Well this is my first post here, and spent a bit of time looking round the forums. Must say some great advice, tips, hints, etc. Quickly falling in love with the site.
I have a problem though. I'm not the most advanced cyclist, i've been cycling for around 8/9 months now and love it. I have a Voodoo Hoodoo based on the review here at Bike Radar. Most of my riding is off road (hence the mountain bike), but i've been roped in to completing a 100 mile road bike ride for charity in a few weeks. Although not adverse to doing 20 - 30 miles on my bike of an evening, finding it a real struggle with the bike on the roads, mainly due to the tyres.
Can i just swap the mountain bike tyres for road tyres? Do i need a new wheel set or can i just replace the tyres? Any special considerations when changing? I also would prefer not to buy a road bike as its not something i would be doing on a regular basis.
Any help advice on this would be great, thank you.
PS. If i've put this in the wrong place i apologies!
I have a problem though. I'm not the most advanced cyclist, i've been cycling for around 8/9 months now and love it. I have a Voodoo Hoodoo based on the review here at Bike Radar. Most of my riding is off road (hence the mountain bike), but i've been roped in to completing a 100 mile road bike ride for charity in a few weeks. Although not adverse to doing 20 - 30 miles on my bike of an evening, finding it a real struggle with the bike on the roads, mainly due to the tyres.
Can i just swap the mountain bike tyres for road tyres? Do i need a new wheel set or can i just replace the tyres? Any special considerations when changing? I also would prefer not to buy a road bike as its not something i would be doing on a regular basis.
Any help advice on this would be great, thank you.
PS. If i've put this in the wrong place i apologies!
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Best thing you can do is go to the LBS and ask there what will fit. And get a track pump as well for the higher pressures you'll want.
They are 26" wheels. I'm off to evans this evening so going to see what they've got in that'll work well with my wheels.
Edit - they inflate to 100psi
I have these on my Cube MTB, as a winter/wet/commute bike, reasonably priced too
Felt AR3 Di2
Cannondale Synapse Carbon Disc Ultegra 2016