Square and Cube Numbers

Question 1

The first four square numbers are
1 × 1 = 1
2 × 2 = 4
3 × 3 = 9
4 × 4 = 16

What is the 12th?

Answer 1

12 x 12 = 144

Question 2

The first four cubed numbers are:
1 x 1 x 1 = 1
2 × 2 × 2 = 8
3 × 3 × 3 = 27
4 × 4 × 4 = 64
What is the fifth?

Answer 2

5 x 5 x 5 = 125

Question 3

Triangle numbers can be represented as a triangle of dots.

The triangle numbers are:
1
1 + 2 = 3
1 + 2 + 3 = 6
1 + 2 + 3 + 4 = 10
1 + 2 + 3 + 4 + 5 = 15

What is the 6th Triangle Number?

Answer 3

1 + 2 + 3 + 4 + 5 + 6 = 21