Multiplication and Division of Rational Numbers

Which of the following expressions gives the positive value?

• $-2\times5$

• $-6\times\left(-2\right)$

• $0\times\left(-1\right)$

• $5\times\left(-3\right)$

Tags

CCSS.6.NS.C.5

CCSS.6.EE.A.2

Which of the following expressions gives the positive value?

• $0\times\left(-3\right)\times\left(-4\right)\times\left(-5\right)$

• $\left(-6\right)\times\left(-15\right)\times\left(-\frac{1}{2}\right)\times\frac{1}{3}$

• $-2\times\left(-12\right)\times\left(+2\right)$

• $-1\times\left(-5\right)\times\left(-3\right)$

Tags

CCSS.6.NS.C.5

CCSS.6.EE.A.2

The reciprocal of  $\frac{1}{2}$  is (     ).

•  $2$  

•  $\frac{1}{2}$  

•  $-\frac{1}{2}$  

•  $-2$  

Tags

CCSS.6.NS.A.1

Which of the following pairs are reciprocals?

• $-5,\ 5$

• $-6\frac{1}{2},\ \frac{2}{13}$

• $0.75,\ \frac{3}{4}$

• $-1,\ -1$

Tags

CCSS.7.NS.A.2

Choose an operation sign such the the expression is correct.

 $-2\ _{\ ---\ \ }\left(-2\right)=-4$  

•  $+$  

•  $-$  

•  $\times$  

•  $\div$  

Tags

CCSS.6.EE.B.5

CCSS.6.EE.A.4

Calculate:  $-100\div5\times\frac{1}{5}$  

•  $4$  

•  $-4$  

•  $-100$  

•  $100$  

Tags

CCSS.6.NS.C.5

CCSS.6.NS.C.6

Calculate:  $\left(-6\right)\div3\times\frac{1}{3}$  

•  $-6$  

•  $6$  

•  $-\frac{2}{3}$  

•  $\frac{2}{3}$  

Tags

CCSS.6.NS.C.5

CCSS.6.NS.A.1

Calculate: $-1\frac{1}{2}\times\left(-\frac{2}{3}\right)=$  

•  $1$  

•  $-1$  

•  $\frac{1}{3}$  

•  $-\frac{1}{3}$  

Tags

CCSS.5.NF.B.4

CCSS.5.NF.B.5

CCSS.5.NF.B.6

If '!' is a new operation in mathematic such that

1! = 1, 2! = 2 x 1 = 2, 3! = 3 x 2 x 1 = 6,

4! = 4 x 3 x 2 x 1 = 24, then the value of 7 x 6! is ( ).

• 42!

• 7!

• 6 x 7!

• 42

Tags

CCSS.6.EE.A.2

CCSS.6.EE.A.4

CCSS.6.EE.A.3

If $abc>0$ ,  $a>0$  and  $ac>0$  , which of the following is correct? 

•  $b<0,\ c<0$  

•  $b>0,\ c<0$  

•  $b<0,\ c>0$  

•  $b>0,\ c>0$  

Tags

CCSS.6.NS.C.5

CCSS.6.EE.B.5

CCSS.6.EE.B.8