I have a 10 X 14 space where I need to completely cover the floor with yoga mats that are 24W X 68L. Can someone please tell me how many mats I'll need. I only learned basic math. Thanks.

Assuming the space is in feet and the mats are in inches.

Convert the space to inches: 120 x 168. Area in square inches is 120*168 = 20160

Area of one mat = 24*68 = 1632

If everything fit perfectly, you would need 20160/1632 = 12.353 mats. Because that answer is not a round number (aka integer) we know (as pbkmaine said) that the fit is not perfect, and you will have to "cut & paste" (so to speak) to get complete coverage. If the mats are easily cuttable, then you need 13 and will have some left over.

Note: even if the division gives an integer one might still have to cut the mats to fit, but we'll leave that for another time.