Show:
Addition
subtraction
Hard addition
more subtraction
Hard subtraction
100

(+12)+(+13)

25

100

(+31)-(-31)

+62

100

(+839)+(-383)

+456

100

(-3)+(-3)

-6

100

(-26)-(+75)

-101

200

(-32)+(+24)

-8

200

(-35)-(-12)

-23

200

10/5


2

200

(-6)-(-12)

+6

200

(-98)-(+37)

-61

300

(-79)+(-65)

-144

300

(+86)-(-78)

+164

300

(+789) + (+865)

+1654

300

(+13)+(-24)

11

300
(-78)-(-98)

-20

400

(+456)+(+835)

1291

400

(+565)-(+234)

+331

400

(+6372)+(-6845)

-473


400

(-45)-(-65)

+25

400

(-34)-(+87)

-121

500

(+666)+(+420)+(+911)+(+21)

2018

500

(-999)-(+333)

-1332

500

(+63273)+(+72818)

+136091

500

(+65)+(+45) 

+110

500

(+379)-(+868)

-498