19 & 20 got into a fight. 21. !!Integers!!

Add 'em Up!

100

3+ (-5)

-2

200

-24+(-18)+(-12)

-54

300

-14+11+(-21)

-24

400

-4,126 + 536

-3,590

500

7,458 + (-207) + (-7394)

-143

Subtraction Is Dead

100

Why is subtraction dead?

We must add the opposite

200

-15 - 7 =

-22

300

-9 - (-3) - 14

-20

400

-800 - (-671)

-129

500

(-540 - 36) + (172 - (-45))

-361

I've got chills...they're MULTIPLYING

100

The product of one positive integer and one negative integer is always...

negative

200

3(-2)(-4)

24

300

-17(40)

-680

400

-18(11)(-4)+3

795

500

(44- (-48))+33 - (-9x10)

215

a house *divided* cannot stand

100

-72 / 12

-6

200

-138 / (-6)

-23

300

-66 / -6

_________

-110 / 5

6

__

-22

400

(-4015 / -803)

5

500

(-45+-18) * (220 - (-450)) / (-20 /(-2))

-4221