Math Is Fun Forum

auyeungyat

Member

Registered: 2013-09-23

Posts: 22

How it's coming?

You pick a number(3 numbers),multiply by 7,11,13,(example:123X7X11X13=123123)
How it comes?

Bob

Administrator

Registered: 2010-06-20

Posts: 10,619

Re: How it's coming?

hi auyeungyat

Welcome to the forum.

I have changed the {} into [] so that your answer is hidden. 

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

mathaholic

Member

From: Earth

Registered: 2012-11-29

Posts: 3,251

Re: How it's coming?

3x7x11x13

21x11x13

231x13

3,003

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Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate

mathaholic

Member

From: Earth

Registered: 2012-11-29

Posts: 3,251

Re: How it's coming?

If 1:

1x7x11x13

7x11x13

77x13

1,001 (just a third of my example above!)

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Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate