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 Question from evelyn, a parent: My son's teacher has given the children this question to answer and I do not have an anser. seven + eight = twelve

That kind of puzzles me too!

I suppose if you wrote the numbers in base 13, it works:

713 + 813 = 1213.

Steve

In January 2010 we received the following from Andrew.

Anyways, thank you for your time.

Thanks Andrew,
from the Math Central Team.

In January 2012 we received the following from Graham and his son.

You have a couple different answers, but my son just brought it home as well and what was needed for him is to replace the SEVEN and EIGHT with the numbers (cannot use a number twice) that when you apply the same to TWELVE you will have an actual addition problem.

Solve for what you know. T has to be 1 because if S and E were 9 and 8, you would have 17. Likewise, S+E must be greater than 9. I must be zero because E+I=E. That also means that V+G is less than 10 or there would be carryover. After that we sorted the numbers as best we could highest to lowest and then plugged
numbers in.

We got:

SEVEN = 69298 and
EIGHT = 90431
TWELVE=159729

69298+90431= 159729.

There are other combos but this is the one came to.

Thanks to both of you. We really appreciate it.
The Math Central Team.

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