Digits, Grade 7, Volume 1, Homework Helper

### 1-3: TEKS Practice

• 1.

• a. Is 3.2 − 5.7 positive, negative, or zero?

• A. negative

• B. zero

• C. positive

• b. Is 3.2 − (− 5.7) positive, negative, or zero?

• A. negative

• B. zero

• C. positive

• 2.

• a. Is 2 fifths , minus . open , negative , 5 sixths , close positive, negative, or zero?

• A. positive

• B. negative

• C. zero

• b. Is 2 fifths , minus . open , 5 sixths , close positive, negative, or zero?

• A. zero

• B. positive

• C. negative

• 3. Decide if each expression describes a difference that is positive, negative, or zero.

• a. Is − 4.5 − (− 6.1) positive, negative, or zero?

• A. negative

• B. positive

• C. zero

• b. Is − 4.5 − 6.1 positive, negative, or zero?

• A. positive

• B. zero

• C. negative

• 4. Draw a point on a number line to indicate the difference 1 , and 1 third , minus 4 , and 5 sixths , .

• 5. Which number line in Figure 1 models 1 fourth , minus . open , negative , 5 eighths , close correctly?

• 6. Find the value of the expression 11.0 − (− 2.1).

• 7. The temperature in a town is 36.6 ° F during the day and −12.6°F at night. Find the difference in the temperatures.

• 8. The freezing point of Chemical A is − 70.2 °C. The freezing point of Chemical B is − 164.21 °C. Which chemical has a higher freezing point? How much higher is it?

• A. The freezing point of Chemical B is °higher than Chemical A's freezing point.

• B. The freezing point of Chemical A is °higher than Chemical B's freezing point.

• 9.

• a. Writing Is 5.3 − 5.3 positive, negative, or zero?

• A. positive

• B. negative

• C. zero

• b. Is 5.3 − (− 5.3) positive, negative, or zero?

• A. negative

• B. positive

• C. zero

• 10.

• a. Reasoning Is negative , 1 third , minus , 4 fifths positive, negative, or zero?

• A. negative

• B. positive

• C. zero

• b. What can you say about the sign of the difference when you subtract − mn, for any positive rational numbers m and n?

• A. The difference is always zero.

• B. The difference is always negative.

• C. The difference is always positive.

• D. The difference is negative if |n|>|m| and positive if |n|<|m|.

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