Quick Add 'Em Quiz
A quiz for use with the February 26th Starter of The Day. Add up a range of numbers using a quick method.
This is level 1; Adding numbers from one to an even number You can earn a trophy if you get at least 3 correct and you do this activity online.
Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.
When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file.
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Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician?
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Level 1 - Adding numbers from one to an even number
Level 2 - Adding numbers from one to an odd number
Level 3 - Adding a miscellaneous range of numbers
More Sequences including lesson Starters, visual aids, investigations and self-marking exercises.
See the National Curriculum page for links to related online activities and resources.
This is a very slow way to add together the numbers from one to ten:
It is much more efficient if you think of the numbers in pairs like this:
[1+10], [2+9], [3+8], [4+7] and [5+6]
There are five pairs and each pair adds up to eleven so the total is:
5 × 11
An animated visualisation of this technique can be seen by pressing the 'Show a hint' button on the 26th February Starter of the Day page.
The general formula for finding the sum of a sequence of numbers is to find the number of terms, multiply it by the first term added to the last term and then divide the answer by two.
This is the formula for an arithmetic sequence, one in which the difference between consecutive terms is always the same.
This formula does not apply to the last question in Level 3!!!