Answer:4. 25/12
Step-by-step explanation:
1. 1/2×2 1/3
1/2 × 7/3
=1×7/2×3
=7/6
=1 1/6
2. 1 7/8 × 4/5
15/8 × 4/5
15×4
8×5
= 60/40
=1 1/2
3. 7/8 × 3 1/4
7/8 × 13/4
7×13
8×4
=91/32
= 2 27/32
4. 1 2/3 × 1 1/4
5/3×5/4
5×5
3×4
=25/12
=2 1/12
5. 3 3/4 × 2 2/5
15/4 × 12/5
15×12
4×5
=280/20
=9
