Answer:
1. 3 1/4 + 2 2/3
= (3 + 2) + (1/4 + 2/3)
= 5 + (3/12 + 8/12)
= 5 + 11/12
= 5 11/12
2. 9.78 - 7.36 = 2.42
3. 3 1/4 + 1 1/4
= (3 + 1) + (1/4 + 1/4)
= 4 + 2/4
= 4 2/4 or 4 1/2
4. What is asked: The total of kilograms of meat she bought.
Given facts: 3 3/4, 2 3/5, 5 1/2
Operation to be used: addition
Number sentence: 3 3/4 + 2 3/5 + 5 1/2 = N
Solve:
3 3/4 + 2 3/5 + 5 1/2
= (3 + 2 + 5) + (3/4 + 3/5 + 1/2)
= 10 + (15/20 + 12/20 + 10/20)
= 10 + 37/20
= 10 + 1 17/20
= 11 17/20
Final answer: She bought a total of 11 17/20 kilograms of meat
5. 1/3 ÷ 4
= 1/3 ÷ 4/1
= 1/3 × 1/4
= 1/12
6. 2/3 × 5/7
= 10/21
7. 16 7/14 - 12 8/21
= (16 - 12) + (7/14 - 8/21)
= 4 + (21/42 - 16/42)
= 4 + 5/42
= 4 5/42
hope it helps!!
