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3. 4, 450
4. 3/4 -5/8= 6/8-5/8 = 1/8
5. 17/5 ÷ 2/10= 17/5 × 10/ 2 = 170/ 10 = 17
6. 35 /10 × 32 /10 = 1120/ 100= 11 ,2
7. 4/7 ÷ 5/10= 4/7 × 10/5= 40 /35 = 8/ 7
8. 3/4 × 375 /100 = 1125 / 400 = 2 325/400 = 2 13/ 16
9. 125/1000- 1/8= 125/ 1000- 125/1000 = 0
10. 17/5 ÷ 5/4= 17/ 5 × 4/5 = 68 /25 = 2 18/25