4/721b

Addition

100

  6

+4

----

10

200

  3

+6

----

9

300

  3

+4

----

7

400

  26

+10

------

36

500

  22

+50

------

72

Who knows it could be anything

100

2 + 2 = 

4

200

6 - 3 = 

3

300

1/2 of 20 =

10

400

5/6 of 24 = 

20

500

1/20 + 1/5 =

1/4

Subtraction

100

  2

-1

----

1

200

8 - 3 =

5

300

9 - 2 = 

7

400

  96

-63

-----

33

500

59 - 33 =

26

Add positive and negative numbers

100

3 + -3 = 

0

200

-1 + -1 =

 -2

300

32 + -8 =

24

400

-47 + 30 = 

-17

500

-67 + -67 = 

-134

Subtract positive and negative numbers

100

-2 - (-3) =

1

200

8 - (-4) = 

12

300

6 - 6 = 

0

400

2 - (-3) =

5

500

-4 - (-7) = 

3