Resoluções - Nível 3

1. B) 17/12
Soma com MMC: 2/3 = 8/12 e 3/4 = 9/12 → 8 + 9 = 17/12

2. B) 1/2
1/3 = 2/6 → 5/6 − 2/6 = 3/6 = 1/2

3. A) 1/3
2×10 = 20, 5×12 = 60 → 20/60 = 1/3

4. C) 2 1/3
Número misto = 2 inteiros + 1/3

5. D) 6/5
4/5 ÷ 2/3 → inverter 2/3 = 3/2 → 4/5 × 3/2 = 12/10 = 6/5

6. C) 31/24
7/8 = 21/24, 5/12 = 10/24 → 21 + 10 = 31/24

7. A) 3 3/4
15 ÷ 4 = 3, sobra 3 → 3 3/4

8. B) 1/9
7/9 = 14/18, 4/6 = 12/18 → 14 − 12 = 2/18 = 1/9

9. A) 1/4
5×3 = 15, 6×10 = 60 → 15/60 = 1/4

10. A) 15/8
3/4 ÷ 2/5 → inverter 2/5 = 5/2 → 3/4 × 5/2 = 15/8