1. 9/11 + 3/11 = 12/11
2. 3⅕ + 2/3 = 16/5 + 2/3 = 48/15 + 10/15 = 58/15
= 3 13/15
3. 2⅛ + 3/4 + 2 = 17/8 + 3/4 + 2 = 17/8 + 6/8 + 2
= 23/8 + 2 = 2⅞ + 2 = 4⅞
4. 1/5 - 1/6 = 6/30 - 5/30 = 1/30
5. 5⅓ - 3⅑ = 16/3 - 28/9 = 48/9 - 28/9 = 20/9
= 2 2/9
6. 3⅖ - 1⅓ + 2/6 = 17/5 - (4/3 + 1/3) = 17/5 - 5/3
= 51/15 - 25/15 = 26/15 = 1 11/15
7. 2½ x 0,33 = 5/2 x 33/100 = 165/200 = 33/40
8. 3/4 : 1/2 = 3/4 x 2 = 6/4 = 3/2 = 1½
9. 3 7/10 : 0,5 = 37/10 : 1/2 = 37/10 x 2 = 74/10
= 7 4/10 = 7⅖
10. 3½ x 0,5 : 1/2 = (7/2 x 1/2) : 1/2 = 7/4 : 1/2
= 7/4 x 2 = 14/4 = 3 2/4 = 3½