Triangle Numbers: Follow the Sequence
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  • Introduction
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 Triangle numbers are formed by building triangle patterns as follows:

 

 

You can draw these shapes or use addition to continue the sequence.

 

You should learn at least the first few triangle numbers....

 

1,  3,  6,  10,  15,  21,  28  .....

  • Question 1
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Is the following number a triangle number?

 

15

No

Yes

  • Question 2
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Is the following number a triangle number?

 

25

No

Yes

  • Question 3
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Is the following number a triangle number?

 

1

No

Yes

  • Question 4
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Is the following number a triangle number?

 

45

Yes

No

  • Question 5
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Is the following number a triangle number?

 

12

No

Yes

  • Question 6
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Is the following number a triangle number?

 

5

No

Yes

  • Question 7
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Is the following number a triangle number?

 

21

No

Yes

  • Question 8
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Is the following number a triangle number?

 

49

No

Yes

  • Question 9
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Is the following number a triangle number?

 

36

No

Yes

  • Question 10
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Is the following number a triangle number?

 

28

No

Yes

Progress