Addition and Subtraction of Rational Numbers

Which of the following expressions is incorrect?

•  $30+\left(-20\right)=\left(-20\right)+30$  

•  $\left(-5\right)+\left(-13\right)=\left(-13\right)+\left(-5\right)$  

•  $\left(-37\right)+16=16+\left(-37\right)$  

•  $10+\left(-20\right)=20+\left(-10\right)$  

Tags

CCSS.7.NS.A.1D

Calculate: $-19+20$  

•  $-39$  

•  $-1$  

•  $1$  

•  $30$  

Tags

CCSS.7.NS.A.1C

Which of the following expressions can get the result equal to  $-5$ ?

•  $\left(-8\right)+\left(-3\right)$ 

• $-\left(+9\right)+\left(-4\right)$

• $\left(+6\right)+\left(-11\right)$

• $\left(-2\right)+\left(+7\right)$

Tags

CCSS.7.NS.A.1D

Calculate: 
 $-3-\left(+6\right)=$  

•  $-9$  

•  $-3$  

•  $3$  

•  $9$  

Tags

CCSS.7.NS.A.1C

Calculate: 
 $-2-1=$  

•  $-3$  

•  $-2$  

•  $-1$  

•  $3$  

Tags

CCSS.7.NS.A.1C

Calculate:  $1-3=$  

•  $2$  

•  $-2$  

•  $-4$  

•  $4$  

Tags

CCSS.7.NS.A.1C

Remove the brackets in expression  $-2-\left(+5\right)-\left(-7\right)+\left(-9\right)$  , we have

•  $-2+5-7-9$  

•  $-2-5+7+9$  

•  $-2-5-7-9$  

•  $-2-5+7-9$  

Tags

CCSS.7.NS.A.1D

Remove the brackets in expression  $\left(+5\right)-\left(+2\right)-\left(-3\right)+\left(-9\right)$  , we have

•  $-5-2+3-9$  

•  $5-2-3-9$  

•  $5-2+3-9$  

•  $5+2-3-9$  

Tags

CCSS.7.NS.A.1B

Three numbers are represented by a, b and c in the given number line. Which of the expressions is incorrect?

• $a-c+b<0$

• $c-a+b>0$

• $a+b+c>0$

Tags

CCSS.7.NS.A.1B