adding and subtracting fractions

• 10/10
• 5/10
• 2/10

 $\frac{a}{15}+\frac{8}{15}\ =\ 1$  

• a=7

• a=8

• a=11

• a=1

 $1\ -\ \frac{1}{4\ }=$  

•  $\frac{2}{4}$  

•  $\frac{3}{4}$  

•  $\frac{4}{4}$  

•  $\frac{6}{4}$  

Is this a correct answer?

• Yes, the student correctly added.
• No, you cannot add unlike denominators
• No, 5 + 7 is not 12
• No, 2 + 3 is not 5

Solve.

• 1
• ⁵/₀
• ⁵/₁₀
• ¹⁰/₀

• 8/8
• 13/18
• 3/8

What is ¹⁵/₁₆ - ¹²/₁₆?

• 1/3

• 14/16 or 1/4

• 3/16

• 2/16 or 1/8

• 2
• 1 an 1/10
• 2 and 5/10

• 7/9
• 11/9
• 6/9

• 8/9
• 1 and 3/9
• 1 and 4/9