The purpose of this activity is to have some fun doing expression work. Students will substitute information into an expression with the end result being their birthday. Feel free to use calculators to make this a quick exercise. Here is the expression.
X = Month Of Your Birthday
Y = Day Of The Month Of Your Birthday
Note the vast amount of grouping symbols the kids will need to keep track of.
Example: My birthday is November 21st
x = 11
y = 21
My Math is thus
7(11) = 77
77 - 1 = 76
76(13) = 988
988+ 21 + 3 = 1012
1012(11) = 11132
11132 -11 -21 = 11100
11100/10 = 1110
1110 + 11 = 1121
1121/100 = 11.21 (11.21 is my b-day)
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