1. 5 1/4+3= 2.5 3/5-2 1/4= 3. 2 2/6×2 4/10= 4. 1 6/9:3 2/6=

1. 5 1/4 + 3
= 21/4 + 3/1
= 21/4 + 12/4
= 33/4
= 8 1/4

2. 5 3/5 – 2 1/4
= 28/5 – 9/4
= 112/20 – 45/20
= 67/20
= 3 7/20

3. 2 2/6 x 2 4/10
= 14/6 x 24/10
= 7/1 x 4/5
= 28/5
= 5 3/5

4. 1 6/9 : 3 2/6
= 15/9 : 20/6
= 15/9 x 6/20
= 3/3 x 2/4
= 6/12
= 1/2