#121 Add and Subtract Integers

Find the sum
 $3+\left(-12\right)$  

Find the difference
 $3-12$  

Find the sum
 $-3+\left(-12\right)$  

Find the difference
 $-3-12$  

Find the sum
 $3+12$  

Find the sum
 $-9+14$  

Find the difference
 $-5-\left(-5\right)$  

Find the difference
 $7-\left(-9\right)$  

Find the difference
 $-4-9$  

Find the sum
 $-24+56$