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Add negative numbers
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Solve equations
100

5 + -2 =

3

100

6 - -3 =

9

100

4a + 2a

6a

100

a = 2

3a + 1

7

100

a + 2 = 3

a = 1

200

11 + -7 =

4

200

17 - -7 =

24

200

3a + 5b + 8a -9b

11a - 4b

200

a = 4    b = 7

a + 3b + 2a

33

200

9 + a = 13

a = 4

300

14 + -23 =

-9
300
- 8 - -11

3

300

4(a + 3)

4a + 12

300

a = 5

6(a + 3)

48

300
- 3 - a = -10

a = 7 or -a = -7

400
52 + -37

15

400

69 - - 13

82

400

6(3a - 7)

18a - 42

400

a = 9 b = 3

2a + 5ab

153


400

a + 2 - 7 = 5

a = 10

500
- 41 + -17
-58
500
- 142 - - 23 = 

-119

500
-4(4a - 9)
-4a + 36
500

a = -3   b = 8

-2(a + 3b)

-42
500

28 - a - 14 = 19

a = -5   or    -a = 5