SAT Math : How to add odd numbers
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Example Questions
Example Question #1 : Even / Odd Numbers
Which of the following could represent the sum of 3 consecutive odd integers, given that d is one of the three?
3d – 6
3d + 3
3d – 9
3d + 4
3d – 3
3d – 6
If the largest of the three consecutive odd integers is d, then the three numbers are (in descending order):
d, d – 2, d – 4
This is true because consecutive odd integers always differ by two. Adding the three expressions together, we see that the sum is 3d – 6.
Example Question #1 : Even / Odd Numbers
–10 and 30
0 and 20
5 and 15
10 and 10
4 and 5
5 and 15
Since 
Example Question #1 : Even / Odd Numbers
The sum of three consecutive odd integers is 93. What is the largest of the integers?
Consecutive odd integers differ by 2. If the smallest integer is x, then
x + (x + 2) + (x + 4) = 93
3x + 6 = 93
3x = 87
x = 29
The three numbers are 29, 31, and 33, the largest of which is 33.
Example Question #1 : Integers
Solve:
Add the ones digits:
Since there is no tens digit to carry over, proceed to add the tens digits:
The answer is 
Example Question #1 : Integers
At a certain high school, everyone must take either Latin or Greek. There are 
If there are 
Example Question #1 : Even / Odd Numbers
Add:
Add the ones digit.
Since the there is a tens digit, use that as the carryover to the next term.
Add the tens digit including the carryover.
The hundreds digit is 7.
Combine the ones digit of each calculation in order.
The answer is:
Example Question #2 : Even / Odd Numbers
Add:
Add the ones digit.
Carry over the one from the tens digit to the next number.
Add the tens digit with the carry over.
Carry over the one from the tens digit to the hundreds digit.
Add the hundreds digit with the carry over.
The thousands digit has no carry over. The second number has no thousands digit. This means that the thousands is one. Combine all the ones digits from each of the previous calculations.
The correct answer is:
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