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Cogito

Grade 7 Math · Chapter 4 · Lesson 3

Practice Worksheet

The Additive Inverse

Subtracting is adding the opposite.

10 problems · about 18 minutes · 7.NS.A.1

NameDate

Figure — use these to answer the problems

Add a negative and watch the movement go left instead of right.
-10-8-6-4-20246810-45
-4 + 9 = 5
Start at-4
Add9
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

3 problems

  1. From “Subtraction as Distance”

    3 − (−8) = ?

    Answer

  2. From “Adding Signed Numbers”

    −9 + 4 = ?

    Answer

  3. From “Finding the Original Price”

    £64 after 20% off. Original in pounds?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. −5 − (−8) = ?

    Answer

  2. 3 − (−5) = ?

    Answer

  3. −7 − 2 = ?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. −6 − (−6) = ?

    Answer

  2. What adds to 12 to give zero?

    Answer

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

2 problems

  1. The Rewrite

    What is 6 − (−4)?

    Answer

  2. The Balance

    A balance of −20 has a debt of 5 removed. What is the new balance?

    Answer