We break apart the first numer:

10+8

the second:

20+1

and add like this:

18+21=10+8 + 20+1

now, we can mix up the order:

18+21=10+8 + 20+1= 10+20 + 8+1

add the parts:

18+21=10+8 + 20+1= 10+20 + 8+1=30+9=39

3 0

3 years ago

The math team does practice drills that each last 1/6 hour. In February the team did practice drills for a total of 24 hours. Ho

kozerog [31]

144 classes. each class is 10 minutes. 6X24= 144

7 0

3 years ago

Emma buys 3 2/3 yards of blue fabric and some yellow yellow fabric at the store she buys a total of 5 1/3 yards of fabric the eq

UkoKoshka [18]

Answer:

yellow fabric 5/3 yards

Step-by-step explanation:

convert the mixed numbers into improper fractions:

3 2/3 = 11/3 5 1/3=16/3

16/3 - 11/3 = 5/3

3 0

3 years ago