Which of the following numbers are triangular numbers?

$2, 3, 4, 5, 6, 9, 10, 25, 27, 28, 35, 36$

Which is the smallest number that can be shown as a line, rectangle and triangle?

Write the next two steps of the given pattern. Can you say how the pattern works.

$1\times 8=8$

$12\times 8=88+8$

$123\times 8=888+88+8$

$1234\times 8=8888+888+88+8$

$12345\times 8=$_____

$123456\times 8=$_____

Write the next two steps of the given pattern. Can you say how the pattern works.

$7\times 11=77$

$63\times 101=6363$

$234\times 1001=234234$

$4189\times 10001=41894189$

$21438\times 100001=$_____

$758321\times 1000001=$______