Simple calculation of 10.6 times 1.1 minus 1.06

10.6*1.1-1.06
=10.6*1.1-10.6*0.1
=10.6*(1.1-0.1)
=10.6*1
=10.6

Calculation: 2007 times 20062007 minus 2006 times 20072007

2007*20062007-2006*20072007
=2006*20062007-2006*20072007+20062007
=-2006*10000+20062007
=20062007-20060000
=2007

A simple operation of subtracting 97 from 203

203-97
=（200+3）-（100-3）
=200+3-100+3
=106

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