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Triangular Numbers

Triangular Numbers. by Ryan and Michael. Introduction. Triangular numbers are numbers that are used to form a triangle. Triangular numbers are 1,3,6,10 and so on. The Rule To Solving Triangular Numbers.

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Triangular Numbers

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  1. Triangular Numbers • by Ryan and Michael

  2. Introduction • Triangular numbers are numbers that are used to form a triangle. Triangular numbers are 1,3,6,10 and so on.

  3. The Rule To Solving Triangular Numbers • For example if you wanted to find the 57th triangular number, you need to add all the numbers from 1 to 57. • So you add 1+2+3+4+5+6+7+8 and so on.

  4. Some Examples • Finding the triangular number of 17 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17=153 • Finding the triangular number of 14 • 1+2+3+4+5+6+7+8+9+10+11+12+13+14=105

  5. Table This is the table of the triangular numbers from 1-20

  6. Pictures

  7. Now for you to do the work • What is the triangular number of 21 =

  8. The Answer • If you got this answer you know how to find triangular numbers. • THE ANSWER IS...... not telling you

  9. the answer is • The answer is... 230

  10. Thanks For Watching • Thanks for watching!

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