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Mathematics, 09.07.2019 18:00 reginaldboyd28
Mental arithmetic: work the following exercises in your head. do not calculate with a pencil or paper. do not use a decimal. think of the number seven. now add eight to it. now add four more. now subtract nine. now add three. your answer is
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Mental arithmetic: work the following exercises in your head. do not calculate with a pencil or pap...
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