Adding and subtracting mixed numbers
Answers are for parents and teachers.
1
A jug holds 1 litre of milk. Seif drinks 3/6 litre. How much is left? Write the subtraction.
1 − 3/6 = 6/6 − 3/6 = 3/6 litre.
2
Find 2 5/6 + 1 4/6.
Wholes 3. Fractions 5/6 + 4/6 = 9/6 = 1 3/6. Sum 4 3/6.
3
A tailor uses 1 3/4 m of cloth for a shirt and 2 2/4 m for a dress. How much cloth in all?
3/4 + 2/4 = 5/4 = 1 1/4; 1 + 2 + 1 = 4. Total 4 1/4 m.
4
Find 5 1/3 − 2 2/3 and check by adding.
5 1/3 = 4 4/3. 4/3 − 2/3 = 2/3 and 4 − 2 = 2. Difference 2 2/3. Check: 2 2/3 + 2 2/3 = 4 4/3 = 5 1/3.
5
Youssef says 3 1/5 − 1 4/5 = 2 3/5. Find his mistake and give the right answer.
He subtracted 4/5 − 1/5. Regroup: 3 1/5 = 2 6/5, 6/5 − 4/5 = 2/5 and 2 − 1 = 1. The answer is 1 2/5.