999

A Maths Starter of The Day

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Arrange the numbers 1 to 9

Arrange the numbers 1-9 to make three 3 digit numbers that add up to 999.

 

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Keywords: Starter | Arithmetic | Investigations | Problem Solving

  • Jon Brian, British School of Bucharest
  • Friday, April 04, 2008
  • "Inspired by those who found 8 correct answers, 5B from the British School of Bucharest found 10!
    Thanks for the stimulus!"
  • Laverne, China
  • Tuesday, March 30, 2010
  • "WOW this exercie blew my mind!!! My year 2 class found 137 different solutions ;)."
  • Year 6 Class, Santa Clara Primary School - Western Australia
  • Monday, October 18, 2010
  • "We got a new record, we were able to achieve 14 different solutions, not using numbers swapped around."

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This starter has scored a mean of 3.4 out of 5 based on 57 votes.

 

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Answers

The answers to this starter can be found on a different page so that you can give students access to this page to work on. We're guessing the students haven't studied calculus yet so here's the secret way the teacher can get to the answers. Differentiate the expression below and type the answer here:

Leave no spaces in what you type.

9x2+2x-3
Computer Teacher, do your students have access to computers?
Do you have "Laptops in Lessons"?

Whether your students each have a TabletPC or share a desktop PC, this activity lends itself to eLearning (Engaged Learning).

Laptop

Here is the URL which will take them to a concise version of this page.

Transum.org/go/?Start=April4

Here's the sort URL which will bring
students to this page to try this activity.

http://www.transum.org/go/?to=999