Signs, Signs, Everywhere There Are Signs
Adding
Subtraction
Word Problems
Rules
100
(+) + (+) =
+
100
3 + 2 =
5
100
4 -3 =
1
100
The temperature in Montreal was -15 degrees C. In New York, the temperature was 11 degrees C. How many degrees warmer was the temperature in New York?
26 degrees warmer
100
If you add and integer and its opposite integer together, the result will always be...
0
200
(+) + (-) =
+/- or 0
200
What is the equation?
-9 + 3 = -6
200
-4 - 3 =
-7
200
Dan and Brianna both invested some of their money in the stock market. Dan lost -$386 and Brianna earned +$521. What is the difference between their earnings and loses?
$907
200
The rule when you are given an integer subtraction problem.
Change it to an addition problem
300
(-) + (-) =
-
300
4 + (-2) =
2
300
-4 - (-3) =
-1
300
A submarine starts at sea level and dives 52m down before coming up 16m. It makes another plunge down 39m and then rises 14m. How many meters is it below sea level?
-61m or 61m below sea level
300
How do you know the answer(sum) to an integer addition question will be (+)?
You are adding two (+) integers.
OR
You are adding a (+) and (-) but the (+) integer is bigger.
400
(+) - (-) =
+
400
-4 + (-3) =
-7
400
What is the subtraction equation?
2 - (-3) = 5
400
The Big Dipper rollercoaster climbs straight up 30m above ground level before it drops 18m. Next, it climbs another 22m before it drops 17m. When the ride is over, the participants are how much higher than ground level?
+17m or 17m above ground level
400
How do you know the answer to a subtraction question will be (+)?
You are subtracting two (+) integers.
OR
You are subtracting a (+) and (-) and the first integer is (+).
500
(-) - (-) =
+/- or 0
500
-29 + 21 =
-8
500
-45 - (-5) =
-40
500
I have some strange dice: the faces show the numbers 1 to 6 as usual, except that the odd numbers are negative (i.e. -1, -3, -5 in place of 1, 3, 5).
If I throw two such dice, which of the following totals cannot be achieved?
a) 3
b) 7
c) 8
b) 7
3 = -1 + 4 or -3 + 6
8 = 4 + 4 or 2 + 6
500
How do you know the answer to a subtraction question will be (-) ?
You are subtracting two (-) integers and the first integer is bigger.
OR
You are subtracting a (+) and (-) and the first integer is (-)