Show:
addition
Subtraction
100

4+18=?

22

100

1-3=?

-2

200

3000+1234=?

4234

200

1718-542=?

1,176

300

5+a=17

A=12

300

18-a=-2

A=-20

400

153+x=-1854

X=-1701

500

1807+a=19,821-(-5,042)

A=23,056