Which numbers can be shown as rectangle?

Which numbers can be shown as square?

Which numbers can be shown as triangles?

Study the pattern.

$1\times 8+1=9$

$12\times 8+2=98$

$123\times 8+3=987$

$1234\times 8+4=9876$

$12345\times 8+5=98765$

Write next four steps. Can you find out how the pattern works?

How do we multiply the numbers $13680347, 35702369$ and $25692359$ with $9$ mentally? What is the pattern that emerges?

Present the successor of $11$ and predecessor of $5$ on the number line.

State whether the statement is true or false and correct the false statement: There is a natural number that has no predecessor.

State whether the statement is true or false and correct the false statement: Zero is the smallest whole number.

State whether the statement is true or false and correct the false statements: A whole number on the left of another number on the number line, is greater than that number.