To add or subtract mixed numbers, add or subtract fractions first, then whole numbers. Add and subtract the mixed numbers below. 19. 1 2/6+3 3/6= 20. 4 1/10+4 8/10 21. 7 2/5+2/5= 22. 7 2/4-3 1/4= 23. 4 5/9- 4 4/9= 24. 47 2/5-2/5=​