1 2/3.
Convert the mixed numbers into improper fractions.
10/3 - 5/3
Subtract the numerators.
10-5=5
Leave the same denominator.
You get 5/3
Covert 5/3 back into a mixed number,
1 2/3
To convert an improper fraction to a mixed number multiply the whole number by the denominator and add the numerator. That is your new numerator and you keep the denominator.
Ex: 2 1/3
You would multiply 2 by 3 and get 6, plus 1 which is 7. The improper fraction would be 7/3.
To turn an improper fraction into a mixed number you see how many times the denominator can go into the numerator fully, that's your new whole number and keep the denominator.
Ex: 5/2
2 can go into 5 twice so the whole number is 2. There is 1 left in the numerator and that stays, so does the denominator.
5/2 = 2 1/2
Hope this helped! Good luck!