Addition and subtraction are opposite operations. You can write
related facts using addition and subtraction.
6 + 4 = 10 and 10  4 = 6 are two ways to write the same problem.
You can use addition and subtraction as opposite
operations to solve any equation. To solve the equation below,
think of it as a subtraction problem.
a + 23 = 47
Rewrite it as a subtraction problem.
47  23 = a
a + 23 = 47
a = 47  23
a = 24
You can check the solution by putting 24 in the place of the variable,
24 + 23 = 47
Rewrite each of the following equations using the opposite operation.
x + 16 = 48

= x
40 + a = 42

= a
25 + y = 50

= y
b + 13 = 24

= b
16 + z = 32

= z
9 + b = 18

= b
7 + s = 21

= s
10 = 20  n
+
= 20
13 = 24  a
+
= 24
8 = 12  y
+
= 12
15 = 30  b
+
= 30
36 = 40  x
+
= 40
19 = 22  s
+
= 22
27 = 34  x
+
= 34
30 = 31  n
+
= 31
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