Question

how many number 5s are there between 1 and 100

Answer 1

Now to find 5s Recall the table of 5
TRICK 1
5,10,15,20,25,30,35,40,45,50,
55,60,65,70,75,80,85,90,95,
100.

TRICK 2:
Using A.P.
a=5 an=100 d=5 n=?
an=a+(n-1)d
100=5+(n-1)(5)
95=(n-1)(5)
95=5n-5
100=5n
5n=100 => 20
so there are are 20 multiples of 5 between 1 to 100

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BUT I THINK SECOND TRICK WILL BE MORE HELPFUL FOR YOU