분수의 덧셈과 뺄셈 단원 종합

J.1J.2Add or subtract. Write each answer in simplest form.

1. 1
   $\frac{3}{5}-\frac{1}{8}=$ 
2. 2
   $\frac{5}{6}-\frac{1}{3}=$ 
3. 3
   $\frac{4}{9}-\frac{1}{8}=$ 
4. 4
   $\frac{1}{6}-\frac{1}{7}=$ 
5. 5
   $5\frac{1}{4}-2\frac{1}{8}=$ 
6. 6
   $5\frac{1}{3}-5\frac{1}{6}=$ 
7. 7
   $4\frac{5}{6}-3\frac{1}{12}=$ 
8. 8
   $3\frac{1}{12}+4\frac{3}{4}=$ 

J.3Round each mixed number to the nearest whole number. Then estimate.

1. 9
   $4\frac{5}{6}-2\frac{1}{3}\approx$ 
2. 10
   $9\frac{5}{8}-8\frac{2}{3}\approx$ 
3. 11
   $7\frac{5}{8}-6\frac{1}{4}\approx$ 
4. 12
   $9\frac{2}{3}-4\frac{5}{6}\approx$ 

J.1J.2Add or subtract. Write each answer in simplest form.

1. 1$\frac{19}{40}$
2. 2$\frac{1}{2}$
3. 3$\frac{23}{72}$
4. 4$\frac{1}{42}$
5. 5$3\frac{1}{8}$
6. 6$\frac{1}{6}$
7. 7$1\frac{3}{4}$
8. 8$7\frac{5}{6}$

J.3Estimate Sums & Differences of Mixed Numbers

1. 9$5-2=3$
2. 10$10-9=1$
3. 11$8-6=2$
4. 12$10-5=5$