Math 7 Lesson Check: Rational number operations

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

-3 ¼ + ½

• -2 ¾
• 3 ¾
• -3 ¾
• -¾

Gretchen spends 1/2 an hour grooming Hobo and 1/3 of an hour riding Hobo. How much time did she spend with Hobo?

• ⅖ hours
• ⅚ hours
• ⅔ hours
• ⅜ hours

-2 ⅙ - (-1 ¾)

• -5/12
• 3 11/12
• 5/12
• -2 1/10

Candice and Chris run a relay race at recess. Candice runs 1 ⅓ of a lap around the track. Chris runs ½ of a lap around the track. How much farther does Candice run than Chris?

• ⅚ laps
• ⅔ laps
• ¾ laps
• ⅙ laps

What is the quotient? -13.8 ÷ -0.11

• -12.5

• 125.454545...

• 13.91

• about -79.7

Tina lives 2 ¼ miles from the library. Sonya lives 3 ½ miles from the library. How much further does Sonya live than Tina?

• 1 ½ miles
• 1 ¼ miles
• ¾ miles
• ⅔ miles

What is the product?

⁴/₅ × -¹/₅

• ^{- 5}/₁₀

• ⁴/₁₀

• ^{- 4}/₂₅

• ⁵/₂₅

A roller coaster begins at 90 feet above ground level. Then it descends 105 feet. Find the height of the coaster after the first descent

• - 15 feet
• 15 feet
• 195 feet
• - 195 feet

What is the difference of –96.43 – (–98.67)?

• –195.1

• –2.24

• 2.24

• 195.1