Multiplying Rational Numbers

Tell whether the expression is positive or negative.

 $-\frac{3}{10}\times\left(-\frac{8}{15}\right)$  

• Positive

• Negative

Tags

CCSS.7.NS.A.2A

Tell whether the expression is positive or negative.  $-6.2\ \times8.18$  

• Positive

• Negative

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

Multiply.  

$-1\times\frac{4}{5}$

•  $\frac{4}{5}$  

•  $-\frac{4}{5}$  

•  $1\ \frac{4}{5}$  

•  $-1\ \frac{4}{5}$  

Tags

CCSS.7.NS.A.2A

Multiply.  

$-\frac{1}{4}\times-\frac{4}{3}$

•  $-\frac{4}{12}\ or\ -\frac{1}{3}$  

•  $\frac{5}{7}$  

•  $\frac{4}{12}\ or\ \frac{1}{3}$  

•  $-\frac{5}{7}$  

Tags

CCSS.7.NS.A.2A

Multiply.

 $\frac{5}{6}\times\left(-\frac{8}{15}\right)$ 

•  $-\frac{40}{90}\ or\ -\frac{4}{9}$  

•  $\frac{40}{90}\ or\ \frac{4}{9}$  

•  $-\frac{45}{90}\ or\ -\frac{1}{2}$  

•  $\frac{45}{90}\ or\ \frac{1}{2}$  

Tags

CCSS.7.NS.A.2A

Multiply.

 $-3\ \frac{1}{3}\times\left(-2\ \frac{7}{10}\right)$ 

•  $-\frac{270}{30}\ or\ -9$  

•  $\frac{270}{30}\ or\ 9$  

•  $-6\ \frac{7}{30}$  

•  $6\ \frac{7}{30}$  

Tags

CCSS.7.NS.A.2A

Describe the error made when someone tried to solve this problem.

• The decimal is in the wrong place, the answer should be 81.4.

• There is no error. This is correct.

• The decimal is in the wrong place, the answer should be 0.814.

• The answer should be negative, because a negative multiplied by a positive equals a negative -8.14.

Tags

CCSS.7.NS.A.2A

The hour hand of a clock moves -30 degrees every hour. How many degrees does it move in  $2\frac{1}{5}$  hours?

• -66 degrees

• 66 degrees

• -62 degrees

• 62 degrees

Tags

CCSS.7.NS.A.3

Evaluate:

 $-3\frac{3}{4}\times\frac{5}{6}-2\frac{1}{3}$  

•  $\frac{19}{24}$  

•  $-\frac{131}{24}\ or\ -5\frac{11}{24}$  

•  $\frac{131}{24}\ or\ 5\frac{11}{24}$  

•  $-\frac{19}{24}$  

Tags

CCSS.7.EE.B.3