Excel formula for rounding

I have two values on an excel spreadsheet Cell A1 is equal to $12.56 and cell B1 is equal to $12. I need a formula that will compare B1 to A1 and give me a message "OK" if the amounts tie. The amounts will generally not tie due to round ding. Can the formual accomodate a rounding difference of 20 and still get the OK message? Below is the formula that I am using. Due to the .56 difference, its giving me the message "This total does not tie to A1"

IF(B1=A1,"OK","This total does not tie to A1"
ConernestoAsked:
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ChloesDadConnect With a Mentor Commented:
if you want to check to see if A1 is within a value of A2 then use this

=if(ABS(A1-A2) < 'your value' ,"YES","NO")
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Angelp1ayCommented:
MROUND should help!
=MROUND(A1,0.2)

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I think you want:
=IF(MROUND(B1,0.2)=MROUND(A1,0.2),"OK","This total does not tie to A1")

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If you want to get fancy and make the message dynamic too you can use this (which when copied down a column will give the correct A1, A2, etc.):
=IF(MROUND(B1,0.2)=MROUND(A1,0.2),"OK","This total does not tie to "&SUBSTITUTE(CELL("address",A1),"$",""))

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ConernestoAuthor Commented:
I want the amount to be OK if the difference in A1 and B2 is $100.00 or less.
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ChloesDadCommented:
Then is my equation use 100 for 'your value' and change it to a <= sign. The use of ABS will ensure that it doesn't matter if A1 > A2 or vice versa
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Angelp1ayCommented:
Nice answer ChloesDad.
I was clearly not understanding the question!
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