quadruple

"She turned sixteen years old last week and got her driver's license. "

"The train tracks are two parallel lines that run through the entire town. "

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The water bottle's capacity is 500 milliliters. "

"The bakery's profits increased this month because they sold many birthday cakes. "

"The multiply of homework assignments this week made me feel overwhelmed. "

"The improvements in the student's math skills were noticeable after the extra tutoring sessions. "

"Quadrupling four gives sixteen."

"The children were running to catch the school bus. "

"Quadrupling four gives sixteen."

"The increase in homework assignments this week was significant. "

"It is difficult to provide for my family working on minimum wage."