Subtraction Equations

1
Subtraction Equations
2
To undo subtraction, add! The inverse of
subtraction is addition.
Check m 8 12 20 8 12
m 8 12
8 8
m 20
3
REMEMBER!
What you do to one side of an equation, you must
do to the other side!
4
Subtraction Equations
Add the constant to both sides to isolate the
variable.
Check y 15 22 37 15 22
y 15 22
15 15
y 37
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Example
Check x 14 31
x 14 31
45 14 31
14 14
x 45
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Problem Solving
Babe Ruth has 41 less career home runs than Hank
Aaron. Babe Ruth has 714 career home runs. How
many career home runs does Hank Aaron have?
Check H 41 714
H 41 714
755 41 714
41 41
H 755
755 home runs
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Problem Solving
Kimberly was born on February 2. She was born 10
days earlier than Kent. On what day was Kent born?
Check K 10 2
K 10 2
12 10 2
10 10
K 12
February 12
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Example
Check f 12 25
f 12 25
37 12 25
12 12
f 37
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Practice
x 5 13
d 12 22
5 5
12 12
x 18
d 34
Check x 5 13
Check d 12 22
10
Practice
a 6 15
d 8 29
6 6
8 8
a 21
d 37
Check a 6 15
Check d 8 29
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Practice
m 30 12
r 14 52
30 30
14 14
m 42
r 66
Check m 30 12
Check r 14 52
12
Practice
p 17 23
g 42 52
40
94
h 11 27
38
h 15 56
71
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Mixed Practice
v 6 25
c 14 3
19
17
x 12 51
39
b 2 12
14
14
Mixed Practice
23 m 71
g 26 41
48
67
8 r 18
10
d 15 26
41