Triangular Numbers by Ryan and Michael.

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Presentation transcript:

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 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.

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

This is the table of the triangular numbers from 1-20 number order # of blocks 1 2 3 6 4 10 5 15 21 7 28 8 36 9 45 55 11 66 12 78 13 91 14 105 120 16 136 17 153 18 171 19 189 20 209 This is the table of the triangular numbers from 1-20

Pictures

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

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

the answer is The answer is... 230

Thanks For Watching Thanks for watching!