Extra Set

Grade 7 · Unit 2 · Prep · Version A · DA01

Positive and negative numbers

Name ________________

Date ________________

Period ________________

1.
Luis is on a number line at 0 and moves 2 units left. What number is Luis on?
Answer. −2
Left of 0 is negative: −2.
2.
Write the opposite of 11.
Answer. −11
The opposite of 11 is −11.
3.
Write the opposite of 12.
Answer. −12
The opposite of 12 is −12.
4.
Write the opposite of 5.
Answer. −5
The opposite of 5 is −5.
5.
Write the opposite of 8. Then Sam needs 4 of that amount. What is the total they need?
Answer. −32
The opposite of 8 is −8. Then multiply by 4: −32.
6.
Write the opposite of 6. Then Luis needs 5 of that amount. What is the total they need?
Answer. −30
The opposite of 6 is −6. Then multiply by 5: −30.
7.
Mei is on a number line at 0 and moves 2 units left. What number is Mei on? Then Elena needs 5 of that amount. What is the total they need?
Answer. −10
Left of 0 is negative: −2. Then multiply by 5: −10.
8.
Write the opposite of 6. Then Luis needs 4 of that amount. What is the total they need?
Answer. −24
The opposite of 6 is −6. Then multiply by 4: −24.
9.
Write the opposite of 3. Then Sam needs 5 of that amount. What is the total they need?
Answer. −15
The opposite of 3 is −3. Then multiply by 5: −15.
10.
Elena is on a number line at 0 and moves 6 units left. What number is Elena on? Then Ava needs 2 of that amount. What is the total they need?
Answer. −12
Left of 0 is negative: −6. Then multiply by 2: −12.
11.
Think
Luis tried this problem:
Luis is on a number line at 0 and moves 12 units left. What number is Luis on?
Luis wrote −13. That is not correct. What is the right answer?
Answer. −12
Luis’s answer −13 is off. Left of 0 is negative: −12.
12.
Think
Theo tried this problem:
Write the opposite of 12.
Theo wrote −24. That is not correct. What is the right answer?
Answer. −12
Theo’s answer −24 is off. The opposite of 12 is −12.

Original extra practice. Keys are computed from the items, not guessed.

Prep · Positive and negative numbers