Add up all the numbers in the
9 times table.

Include all the multiples up to
ten times nine.

What is the most elegant way of doing this task?

Topics: Starter | Arithmetic | Number

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• Perhaps this should have been worded as the total of the multiples of 9 up to 10 x 9. The total of the numbers in the 9 times table is actually 640. Try it!
• Best Year 7 Maths Gruop Ever!, King Alfred's College OXON
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• We thought that the starter today was really easy because we all know the 9 times table and we saw the pattern in it :).
• Mr Parsons, Ashcroft High
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• Ryan and Dave got this within half a minute.
• Destwd, Bratislava
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• This starter provides opportunity to discuss place value the sum of consecutive numbers, triangular numbers, pair bonds to 9, pair bonds to 10. Not difficult to solve but provides an interesting starter for further discussion.
• Mrs K, Maths Musketeers
•
• We thought this was fun. We learned how to add it in a different way.
• Maths Brainy Badgers, United Kingdom
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• We thought it was tricky at first and then we started seeing patterns and we found a really quick way to do it. We might try it with different times tables.

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.

Previous Day | This starter is for 18 January | Next Day

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Educational Technology on Amazon

 Teacher, do your students have access to computers such as tablets, iPads or Laptops?  This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=January18 However it would be better to assign one of the student interactive activities below.

Here is the URL which will take them to some practice for the quick method.

Here is the URL which will take them to Transum's most popular times tables program.

Transum.org/go/?to=TablesMaster

Here are some more sugested activities that have a connection with the number nine.

#### Nine Nine Nine

A challenge to use the digits 1 to 9 to make three 3 digit numbers which add up to 999.

Transum.org/go/?to=999sum

#### Nine Times Fingers

Learn your 9 times table fast using your fingers. Then practise so that you are faster than fingers!

Transum.org/go/?to=fingers

##### A Trick

Investigate this amazing mind reading performance based on simple mathematical principles.