Rational Number Operations

Solve:  $-13\cdot5$  

Answer explanation

Negative times positive is positive, and  $13\cdot5=65$  !

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

Solve:  $4\frac{1}{3}+-7\frac{7}{8}$  

Answer explanation

If you missed this one because of formatting, blame Quizizz! :)  If your answer is radically different, check that you used common denominators.

Tags

CCSS.7.NS.A.1C

Solve:  $120\div-15$  

Answer explanation

Positive divided by negative is negative, and  $120\div15=8$  !

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

Solve:  $-25-8$  

Answer explanation

If you answered -17, try rewriting this in its addition form using Keep, Change, Switch!

Tags

CCSS.7.NS.A.1C

Answer explanation

If your answer got marked incorrect because of formatting, move on to the next question. If you missed this one -- did you make a number line? It may help you to visualize.

Tags

CCSS.7.NS.A.3

Solve:  $-3-\left(-19\right)$  

Answer explanation

If you got a negative answer, try rewriting this in its addition form using Keep, Change, Switch!

Tags

CCSS.7.NS.A.1C

Answer explanation

If your answer was marked incorrect because of formatting, move on to the next question. Did you notice all of the details for this situation? When subtracting "vertically", make sure that the larger number is on top.

Tags

CCSS.7.NS.A.3

Will this product be positive or negative?

 $\left(-4\right)\left(-14\right)\left(2\right)\left(-1\right)$  

• Positive

• Negative

Answer explanation

Since there are an ODD number of negative factors, there will be a "leftover" negative, and the product will be negative.

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

Solve: 

 $\left(-4\right)\left(-14\right)\left(2\right)\left(-1\right)$  

Answer explanation

Work carefully, with two factors at a time.  Note that multiplying a number by negative 1 simply "switches" its sign.

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

True or False: The expressions below are equivalent.

 $\frac{-5}{9}$  and  $\frac{-5}{-9}$  

• True

• False

Answer explanation

Since negative divided by positive is negative, the first expression has a value of negative 5/9.  Since negative divided by negative is positive, the second expression has a value of positive 5/9.

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B