Nine Digit Sum

Starter of The Day Transum Mathematics Topics

Topics: Starter | Arithmetic | Place Value | Problem Solving | Puzzles

Transum,
What strategy could you use to solve a puzzle like this? I began by calculating the sum of the digits one to nine. I then considered in turn the following three possibilities:

1. The sum of each column is less than ten which means there is no ‘carry’;
2. There is one carry (either from the units to the tens or the tens to the hundreds column);
3. There are two carries (both from the units to the tens and the tens to the hundreds column).

The rest of the strategy and all 336 different solutions are given in the answer section below for subscribers.
Alexa,
I got it!
When I got the answer right it gave me a confetti party with music on the screen!
Thank you!

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Previous Day | This starter is for 3 August | Next Day

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	Teacher, do your students have access to computers? Do they have iPads or Laptops in Lessons? Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Here a concise URL for a version of this page without the comments.

Transum.org/go/?Start=August3

Here is the URL which will take them to an interactive pupil version of this puzzle.

Transum.org/go/?to=ninedigits

A Mathematics Lesson Starter Of The Day

Answers