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 Lesson 1, Problem 1

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Dojo
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PostSubject: Lesson 1, Problem 1   Fri Aug 15, 2008 6:37 pm

1) How many numbers are there from:
a) 2~20?
b) 7~16?
c) 4~13?

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herefishyfishy1
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PostSubject: Re: Lesson 1, Problem 1   Sat Aug 16, 2008 7:36 am

Wait, can we post the answers here?
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isabella2296
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PostSubject: Re: Lesson 1, Problem 1   Sat Aug 16, 2008 7:57 am

1) 20 - 2 + 1 = 19

2) 16 - 7 + 1 = 10

3) 13 - 4 + 1 = 10
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Dojo
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PostSubject: Re: Lesson 1, Problem 1   Sat Aug 16, 2008 12:59 pm

@ fish yes
@ izzy sure thats one way but in my opinion theres a faster way.

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AIME15
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PostSubject: Re: Lesson 1, Problem 1   Sat Aug 16, 2008 1:37 pm

Dojo wrote:
1) How many numbers are there from:
a) 2~20?
b) 7~16?
c) 4~13?

a) subtract one from the whole thing to get 1-19, so 19.
b) subtrac 6 from the whole lthing to get 1-10, so 10
c) subtract 3 from whole thing to get 1-10, so 10.
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