rational number operations

Which expression can also be used to calculate the expression above?

• 
• 
• 
• 

What is the product?
⁴/₅ × ¹/₅

• ⁵/₁₀
• ⁴/₁₀
• ⁴/₂₅
• ⁵/₂₅

What is the sum?
 $\frac{4}{5}+\frac{1}{5}$  

•  ^{$\frac{5}{10}$} 

•  ^{$\frac{1}{2}$} 

• 1

•  _{$\frac{4}{5}$} 

What is the sum?
13.8 + 0.11

• 13.91
• 1.49
• 14.9
• 149

What is the sum of 1.70+4.65?

• 2.95
• 5.35
• 6.35
• a decimal