Rational Numbers

Ben purchased lunch at the school cafeteria for $2.75. Before today, Ben owed $9.15 on his lunch account. What is the status of his lunch account after today?

• -$11.90

• $2.75

• $4.59

• $8.97

The highest mountain in the world is Mt. Everest, whose peak is 29, 029 feet above sea level. But the tallest mountain is Mauna Kea. The base of Mauna Kea is 19,669 feet below sea level, and its peak is 33,465 feet above its base. How much higher above sea level is Mt. Everest than Mauna Kea?

• 15,233 feet

• 10,047 feet

• 3,084 feet

• 2,845 feet

A drilling crew dug to a height of -45 1/4 feet during their first day of drilling. On the second day, the crew dug down 9 1/3 feet more than on the first day. Describe the height of the bottom of the hole after the second day.

• -3 1/2 feet

• -99 5/6 feet

• 84 feet

• -87 1/3 feet

The ancient Babylonians were writing fractions in 1800 BC. But they did not have a concept of zero until about 1480 years later. In what year did the Babylonians develop the concept of zero?

• 467 BC

• 6000 BC

• 311 BC

• 247 BC

Hydrogen Freezing Point? -434°

Phosphorus Freezing Point 111.7°

Patricia and Elliot are trying to figure out how much the temperature would have to increase from the freezing point of hydrogen to reach the freezing point of phosphorus. Patricia says the temperature would have to increase 545.7 degrees, and Elliot says the temperature would have to increase 322.3 degrees. Who is correct?

• Patricia

• Elliot

Nitrogen's Freezing Point -345 3/4°

Mercury's Freezing Point -37 7/10°

Francine and Lisa are trying to figure out how much the temperature would have to increase from the freezing point of nitrogen to reach the freezing point of mercury. Francine says the temperature would have to increase 308 1/20°, and Lisa says the temperature would have to increase 383 9/20°. Who is correct?

• Francine

• Lisa

Yesterday, Katrina was just $23.75 below her fundraising goal. She got a check today for $12.33 to put toward the fundraiser. What is the sum?

• 11.42

• 12.54

• 34.85

• 1002.33