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Topics: Starter | Algebra | Number Patterns | Problem Solving

Kerei James, NZ
Thursday, February 18, 2010
"It is an excellent resource."
S.W, Redbourn Junior
Monday, July 05, 2010
"I would have this starter up when the children enter the room. They work out the answer on white boards and as soon as they have finished they write their initials against the highest number available in a list of numbers from 1 to 10 on another board - the TOP TEN list. When the TOP TEN is full up we stop and look at the answer together."
Nicola, Neilston Primary School
Thursday, February 23, 2012
"My class counted them all up and got the answer 703 then double checked it with a calculater and they were correct."
Class A, Furness Vale Primary School
Tuesday, February 26, 2013
"We get 1176 doubled checked on a calculator."
Cody Reimer, Acadia Junior High, Canada
Tuesday, March 19, 2013
"The correct answer is 820 like it says at the bottom. The formula you use is for consecutive sum.
sum=n*(n+1)/2
sum = 40(40+1)/2
sum = 1640/2
sum = 820."

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This starter has scored a mean of 3.5 out of 5 based on 145 votes.

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Answer

1540

Note to teacher: Doing this activity once with a class helps students develop strategies. There is a very quick method for doing this calculation! It is only when they do this activity a second time that they will have the opportunity to practise their strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from a random number.


	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).

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

Transum.org/go/?Start=February26

Here is the URL which will take them to a related practice activity.

Transum.org/go/?to=adem

The famous Mathematician Carl Gauss found a quick way to perform this type of calculation when he was a boy; a long time before calculators!
Students could search the web for details of this story.

Carl Gauss