Add and Subtract Integers 1

Years

Year 8

Directed Numbers

Add and Subtract Integers

Add and Subtract Integers 1

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Question 1 of 4

1. Question
Evaluate

$-9-4$
- (-13)
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Same Sign = Find the Sum

Different Sign = Find the Difference

Method One

Since the signs are the same $(- -)$ we will find the sum of the two numbers

$9+4$ $=$ $13$ Find the Sum

$\text(Sum)$ $=$ $13$

Insert the sign of the larger number $(-9)$ to the sum

$-9-4$ $=$ $-13$ Insert a negative sign since the larger number, $9$ , is negative

$-13$

Method Two

Start at $-9$ , then since $4$ is negative move left $4$ places

$-9$ $-4$ $=$

$-9-4$ $=$ $-13$

$-13$
Question 2 of 4

2. Question
Evaluate

$-8+11$
- (3)
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Same Sign = Find the Sum

Different Sign = Find the Difference

Method One

Since the signs are different $(- +)$ we will find the difference of the two numbers

$11-8$ $=$ $3$ Find the Difference

$\text(Difference)$ $=$ $3$

Insert the sign of the larger number $(+11)$ to the difference

$-8+11$ $=$ $3$ Insert a positive sign since the larger number, $11$ , is positive

$3$

Method Two

Start at $-8$ , then since $11$ is positive, move right $4$ places

$-8$ $+11$ $=$

$-8+11$ $=$ $3$

$3$
Question 3 of 4

3. Question
Evaluate

$-5+6$
- (1)
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Same Sign = Find the Sum

Different Sign = Find the Difference

Method One

Since the signs are different $(+ -)$ we will find the difference of the two numbers

$6-5$ $=$ $1$ Find the Difference

$\text(Difference)$ $=$ $1$

Insert the sign of the larger number $(+6)$ to the difference

$-5+6$ $=$ $1$ Insert a positive sign since the larger number, $6$ , is positive

$1$

Method Two

Start at $-5$ , then since $6$ is positive move right $6$ places

$-5$ $+6$ $=$

$-5+6$ $=$ $1$

$1$
Question 4 of 4

4. Question
Evaluate

$-7-2$
- (-9)
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Same Sign = Find the Sum

Different Sign = Find the Difference

Method One

Since the signs are the same $(- -)$ we will find the sum of the two numbers

$7+2$ $=$ $9$ Find the Sum

$\text(Sum)$ $=$ $9$

Insert the sign of the larger number $(-7)$ to the sum

$-7-2$ $=$ $-9$ Insert a negative sign since the larger number, $7$ , is negative

$-9$

Method Two

Start at $-7$ , then since $2$ is negative move left $2$ places

$-7$ $-2$ $=$

$-7-2$ $=$ $-9$

$-9$

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Quiz summary

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1. Question

Hint

Correct!

2. Question

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Nice Job!

3. Question

Hint

Correct!

4. Question

Hint

Well Done!

Quizzes

$9+4$	$=$	$13$	Find the Sum
$\text(Sum)$	$=$	$13$

$11-8$	$=$	$3$	Find the Difference
$\text(Difference)$	$=$	$3$

$6-5$	$=$	$1$	Find the Difference
$\text(Difference)$	$=$	$1$

$7+2$	$=$	$9$	Find the Sum
$\text(Sum)$	$=$	$9$