Three months ended

March 31,

(Amounts in millions, except per share amounts)

2012

2011

Numerator:

Net income attributable to 3M

$

1,125

$

1,081

Denominator:

Denominator for weighted average 3M common shares outstanding — basic

696.8

711.5

Dilution associated with the Company’s stock-based compensation plans

9.3

14.9

Denominator for weighted average 3M common shares outstanding — diluted

706.1

726.4

Earnings per share attributable to 3M common shareholders — basic

$

1.61

$

1.52

Earnings per share attributable to 3M common shareholders — diluted

$

1.59

$

1.49