UA · Unit 3 review

1. 1.

   Compute (−4) × (−3).

   Answer. 12

   A negative times a negative is positive: 12.

2. 2.

   Compute (9) ÷ (3).

   Answer. 3

   9 ÷ 3 = 3.

3. 3.

   Write 12 as a decimal. Does it terminate or repeat?

   Answer. 0.5 (terminating)

   1 ÷ 2 = 0.5, which is terminating.

4. 4.

   Evaluate −6 + (2) × (−3).

   Answer. −12

   Multiply first: 2 × −3 = −6. Then −6 + −6 = −12.

5. 5.

   Compute (−5) × (−6). Then Malik needs 4 of that amount. What is the total they need?

   Answer. 120

   A negative times a negative is positive: 30. Then multiply by 4: 120.

6. 6.

   Compute (−4) ÷ (−2). Then Mei needs 4 of that amount. What is the total they need?

   Answer. 8

   −4 ÷ −2 = 2. Then multiply by 4: 8.

7. 7.

   Is 14 a terminating or repeating decimal? Write a complete answer — Theo will compare with a partner.

   Answer. terminating

   Denominator 4 → terminating.

8. 8.

   Evaluate 6 + (−3) × (2). Then Owen needs 4 of that amount. What is the total they need?

   Answer. 0

   Multiply first: −3 × 2 = −6. Then 6 + −6 = 0. Then multiply by 4: 0.

9. 9.

   Compute (−5) × (−4). Then Grace needs 4 of that amount. What is the total they need?

   Answer. 80

   A negative times a negative is positive: 20. Then multiply by 4: 80.

10. 10.

    Compute (24) ÷ (−6). Then Owen needs 2 of that amount. What is the total they need?

    Answer. −8

    24 ÷ −6 = −4. Then multiply by 2: −8.

11. 11.

    Think

    Luis tried this problem:
    Is 12 a terminating or repeating decimal?
    Luis wrote terminating (check this). That is not correct. What is the right answer?

    Answer. terminating

    Luis’s answer terminating (check this) is off. Denominator 2 → terminating.

12. 12.

    Think

    Theo tried this problem:
    Evaluate 7 + (−5) × (2).
    Theo wrote −4. That is not correct. What is the right answer?

    Answer. −3

    Theo’s answer −4 is off. Multiply first: −5 × 2 = −10. Then 7 + −10 = −3.

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