Broadbent Maths
Broadbent Juggler
Sign In
Broadbent Maths
Broadbent Maths - creative primary maths

A consecutive date - great time for an investigation!

11th December 2013 is the last date for 90 years that three consecutive numbers will line up.  
Celebrate it in your school by using the date as a starting point to investigate consecutive numbers.

11th day, 12th month , year 2013

11 + 12 + 13 = 36

Which three consecutive numbers total 72?        (23, 24, 25)

What do you notice?      

Do you spot any patterns when adding any three consecutive numbers? Try with smaller numbers.



1+2+3 = 6
2+3+4 = 9
3+4+5 = 12

Continue the pattern

What do you notice?  Do you spot any patterns when adding any three consecutive numbers?

(Sum is always multiple of 3, and it is 3 times the centre number)

Why does this happen?      Can you make up a general rule for this?

11/12/13 is also known as Noughts and Crosses Day as it shows three in a row (!), so make sure you celebrate it in your school.

Related articles

Calculate the day of the week for any date
Lots of maths learning a fun skill of naming the day for any date

A Special date with consecutive square numbers
4th September 2016 was a square day! 4.9.16. Explore other square days.

Palindromic dates - how many can you find?

21.11.12 or 31.1.13 - will there be any palindromic dates in the next year?

All about 15 maths activities for 15.12.15
These ideas can be adapted... 16 minutes of maths for 16th of September, October, November or December 2016.
This includes finding Fibonacci numbers in nature, exploring patterns and rules in number sequences, sunflowers and cones

2013 was the first year not to have a repeating digit since 1987
When will be the next time that a year has a repeating digit?
Like us...
Follow us...
Connect with us...
Website design by SiteBuilder Bespoke