Show:
Rules
Addition/Subtraction
Multiplication/Division
Riddles
100
When you add two positives you (sometimes/always/never) get a positive sum.
What is always
100

-4 + 8 =

what is 4?

100

-1 x -25 =

What is 25

100

Solve and check: 5t + 31 = -9

What is x = -8?

200
When you add two negatives you (sometimes/always/never) get a positive sum.
What is never
200

-1 - (-1) = 

What is 0

200

-21 ÷ -7

What is 3

200

Using three integers, addition and subtraction, write an expression that equals -3.

What is…?

300
When you multiply two integers with the same sign you (sometimes/always/never) get a negative product.
What is never
300

|4 - 7|

What is 3?

300

-34

What is -81?

300

Write an expression: if you earn $6 per hour for x hours, then pay back $10, how much do you have?

What is 6x - 10 dollars?

400
When you divide by two integers with different signs you (sometimes/always/never) get a negative product.
What is always
400

-224 - (-35+10) =

What is -199

400

9 • -8 ÷ -2

What is 36?

400

Noe Etal transforms 3 - x = 5 by subtracting 3 from each member, getting x = 2.  What did Noe do wrong and what is the right answer?

What is: he forgot that there is still a negative sign attached to the x.  The right answer is x = -2

500
You call both positive and negative whole numbers this.
What are integers
500

-3 + 8 - (-12) =

What is 9?

500

-(-2)5

What is 32?

500

Write an expression: Start 20 miles from home.  Ride your bike 9 miles per hour away from home for x hours.  How far are you from home?

What is 20 + 9x miles?