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Subtract using variables
Challenge
100

Evaluate the expression for 

   y = 2 and = 3

     y + z = ?

y + z = ?

2 + 3 = 5

100

12 +  a =    17


a = ?

         a = 5


12 + 5 = 17

100
Define 'variable'

variable is a letter used as a placeholder in a math problem


variable takes the place of a mystery amount in a math problem

100

14  -  12  =    a


a = ?

a = 2


because 14 - 12 = 2

100
a = 25     b  =   100     c =   12


a + b + c =   d


Solve for d

d = 137


because 25 + 100  + 12 = 137

200

a = 7     and  b =  3


a + b = ?

a + b = ?     if a = 7 and b = 3


7 + 3 = 10

200

2 + b = 28


b = ?

   2 + 26 = 28


b = 26

200

If      b + 3 = 21,  what is the value of b?

b = 18  

because 18 + 3 = 21

200

25 -  b =  25


b = ?

b = 0 


because 25 - 0  = 25

200

12p = 48


solve for p

p = 4


because 12(4) = 28

300

d = 12     and    e  =   14


d + e =  ?

12 + 14 = 26

300

a +  45   =   49


a = ?

   4 + 45 = 49


a = 4

300

If James bought x amount of oranges and 12 apples, with 15 pieces of fruit all together, how many oranges did he buy?



x = 3

because 15 - 12 = 3

and 12 + 3 = 15

300

x - 100 = 75


x = ?

x = 175


because 175 - 100 = 75

300

y = 38x        if   x = 2


y = ?

y = 76


because 38(2) = 76

400


x = 17      y = 20

  

         z = x + y

   17 + 20  =  37 


z = 37

400

b + 3 + 3 = 12


b = ?

6 + 3 + 3 = 12


b = 6

400

In the equation:


a + 3 = 23,  what is the value of a?

a = 20 because 20 + 3 = 23


and 23 - 3 = 20

400

127 - c =  2


c = ?

c = 125


because 127 - 125  = 2

400

12a  +   2a   +  7b = c        if     a = 2   and b = 3


c = ?

c = 49 


because  12(2) = 24, 2(2) = 4, 7(3) = 21.....

   24 + 4 + 21 = 49

500

        a = 2       b = 12     c = 9


a + b + c =  ?

a + b + c =  ?


2 + 12 + 9 = 23



500

x + 3 + 12 =  20


x = ?

5 + 3 + 12 = 20


x = 5

500
I can check my division by using ___________.


I can check my multiplication by using __________. 

   I can check division by using multiplication.


 I can check multiplication using division.

500
v -  w  = y       if    v = 128    and w  =  125


y = ?

y = 3 

   because 128 - 125 = 3

500
2w +  19x + 20y = z         if  w = 8,      x = 2,     y= 0


z = ?

z = 54


because 2(8) = 16,  19(2) = 38 ,  20(0) = 0

16 +  38 = 54

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