Question

Write all the factors of given table.

Numbers	Factors
45	1,3,5,9,45
40	1,2,3,4,5,8,10,20,40
32	...
18	...
25	...

See unit place of all the numbers which have 5 as one factor.

Answer 1

Completing the table –

Numbers	Factors
45	1,3,5,9,45
40	1,2,3,4,5,8,10,20,40
32	1,2,4,8,16,32
18	1,2,3,6,9,18
25	1,5,25

All the numbers which has unit digits 0 or 5, their one factor is 5.