Add and subtract negatives: 7th grade math
Add/subtract integers and rationals on a number line; additive inverse. A free 7th grade lesson plan, a question set with answers and a printable sheet with its key. Copy it and make it yours.
Lesson plan
Goal
- Students can do this: add/subtract integers and rationals on a number line; additive inverse.
Teach (10 min)
- Think money. A negative number means you owe.
- Same signs: add the sizes, keep the sign. Different signs: subtract the sizes. The bigger size wins the sign.
- Write the sign of your answer first, then figure out the number.
- Work one example on the board while students say each step aloud, then do one together.
Practise (15 min)
- Students work the printable sheet in pairs, then alone.
- Or practise it as a game with no sign-up: https://peabody.kids/math/signed.add?lesson=7-add-int&at=7
Exit ticket (5 min)
- Three questions on a slip:
- 1. 4 + (−5) = ?
- 2. 8 + (−6) = ?
- 3. −8 + 8 = ?
Question set
10 questions that read in words, easiest first. Questions that need a picture are on the printable sheet below.
- 4 + (−5) = ?
- 8 + (−6) = ?
- −8 + 8 = ?
- −5 + 1 = ?
- −8 + 9 = ?
- 3 + (−3) = ?
- −4 + (−7) = ?
- −3 + 5 = ?
- 7 + (−12) = ?
- −3 + 4 = ?
Answers
- −1
- 2
- 0
- −4
- 1
- 0
- −11
- 2
- −5
- 1
Printable sheet
Name: ____________________ Date: ____________
Add and subtract negatives (7th grade)
- −1 + 1 = ?
- 2 + (−8) = ?
- 9 + (−8) = ?
- −2 + (−4) = ?
- 3 + (−2) = ?
- −5 + (−12) = ?
- −12 + 7 = ?
- −8 + 18 = ?
- −8 + (−2) = ?
- −1 + 19 = ?
- −11 + 25 = ?
- −6 + (−1) = ?
Key
- 0
- −6
- 1
- −6
- 1
- −17
- −5
- 10
- −10
- 18
- 14
- −7
Written by Peabody from its own skill pages. Free, no ads, no sign-in. Children can practise this on Peabody. More from teachers: teacher-shared resources.