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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Topics: 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."
  • Mandy,
  • Thursday, April 19, 2012
  • "Incredible! My class found 97 solutions!"
  • Mrs Maclean, St Andrews RC High School
  • Tuesday, April 24, 2012
  • "This is a great starter activity! Not only did my S2 class calculate many different soltions they calculated exactly how many different solutions are possible. They loved the challenge!"

    •  

  • Sycamore Class, West Borough Primary School
  • Thursday, May 31, 2012
  • "A supreme game! The girls were much quicker than the boys. We found ten solutions before starting our day!"
  • D Brunner, Ilfracombe
  • Wednesday, October 10, 2012
  • "There are actually only 5 solutions with all others being a permutation of the digits in the columns.
    Hundreds column can only be digits 125 or 134 (any arrangement)
    If 125 then tens column can only be 369, 378 or 648, with remaining digits in the units column.
    If 134 then tens column can only be 279 or 567 with remaining digits as units.
    These correct columns can be arranged in 6 different ways each giving 6x6x6=216 combinations x 5 solution sets = 1080 possible."

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This starter has scored a mean of 3.6 out of 5 based on 103 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
Laptops In Lessons

Teacher, do your students have access to computers?
Do they have Laptops in Lessons or iPads?

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

Laptops In Lessons

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

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