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How many 2-digit numbers that is divisible by 5?

Sagot :

[tex]There\ are\ 18\ two-digit\ number... \\ \\ If\ you\ want\ to\ question\ me\ why\ I\ derive\ to\ that\ answer... \\ (Then,here's\ the\ secret!!! :) \\ \\ 5 \times\underline{10}\to\boxed{50} \\ \\ Well,let's\ try\ this... \\ \\ 5 \times\underline{20}\to\boxed{100} \\ \\ Thus,\underline{100}\ is\ not\ a\ \underline{two-digit\ number}? \\ \\ Let's\ try\ this\ one... \\ \\ 5\times\underline{19}\to\boxed{95} \\ \\ Therefore,there\ are\ \boxed{\boxed{18\ two-digit\ numbers\ that\ is\ divisible\ by\ 5}}[/tex]
2 digit numbers divisible by 5:
10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95

The answer is 18. Hope this helps