Addition and Subtraction of Negative Numbers

Is the sum of -7 + 5 positive or negative?

• Positive
• Negative

Tags

CCSS.7.NS.A.1C

Solve:   $-16+24$  

(a)  

Answer explanation

MC Santi says: "Different signs: SUBTRACT!"  And give the answer the sign of the "bigger" number, which in this case is the 24.

Another way to think of this is that "the positive team wins by 8".

Tags

CCSS.7.NS.A.1C

Solve:   $14-22$  

(a)  

Answer explanation

Try rewriting this subtraction problem in its addition form using "keep, change, switch".  Then apply the addition rules.

Tags

CCSS.7.NS.A.1C

Solve:  $-12+-15$  

(a)  

Answer explanation

MC Santi says: "Same signs: ADD" and give the answer the same sign as the numbers.

Tags

CCSS.7.NS.A.1C

Solve:   $4-\left(-9\right)$  

(a)  

Answer explanation

Try rewriting this in its addition form, using "keep, change, switch".  You'll be glad you did!

Tags

CCSS.7.NS.A.1C

0 - 16

• 16
• 0
• -16
• 5

Tags

CCSS.7.NS.A.1C

-10+4

• -14
• 14
• -6
• 6

Tags

CCSS.7.NS.A.1C

-9 + 9

• 18
• -18
• 0
• 81

Tags

CCSS.7.NS.A.1B

- 2 - 9

• -11

• 11

• -7

• 7

-2+8

• 6

• -6

• -10

• 10