Addition - JUST ADD
Addition - Subtract to solve
Subtraction - JUST SUBTRACT
Subtraction - Add to solve
Subtraction - Swap then subtract
100
20 + 38 = n
n = 58
100
24 + n = 30
n = 6
100
21 - 10 = n
n = 11
100
n - 9 = 11
n = 20
100
13 - n = 6
n = 7
200
27 + 42 = a
a = 69
200
e + 25 = 40
e = 15
200
33 - 12 = b
b = 21
200
m - 10 = 16
m = 26
200
24 - d = 12
d = 12
300
33 + 48 = x
x = 81
300
43 + j = 75
j = 32
300
45 - 36 = t
t = 9
300
h - 13 = 25
h = 38
300
39 - i = 14
i = 25
400
49 + 53 = c
c = 102
400
k + 27 = 60
k = 33
400
52 - 27 = y
y = 25
400
r - 26 = 35
r = 61
400
54 - o = 27
o = 27
500
65 + 79 = g
g = 144
500
78 + s = 92
s = 14
500
87 - 49 = q
q = 38
500
v - 38 = 59
v = 97
500
92 - p = 58
p = 34
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