Subtracting integers

Subtracting a number is adding its opposite. 5 - (-3) becomes 5 + 3.

Standards:7.NS.A.1.c

Try it: three questions

Real questions from the practice bank. Tap an answer to check it.

Question 1 of 3

A submarine is at 180 meters below sea level. It rises 65 meters. What is its new depth below sea level?

Question 2 of 3

The temperature at noon was 12°C. By evening, it dropped to −8°C. How many degrees did the temperature fall?

Question 3 of 3

A submarine is at 150 meters below sea level. It rises 85 meters. What is its new depth below sea level?

How this fits in

Subtracting integers is one skill in the Integers & Operations unit. Students read the unit lesson, then earn a bronze, silver, or gold medal on their last 10 answers. Medals never go down. A mastered unit comes back for review after 1, 3, 7, 16, and 35 days so it stays learned.

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