How long should this take most people to process mentally ? I am testing my

I

I love different cultures

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mental math skills here? I am testing how good I am at mental MATH ... How long would it take most people to process this mentally without any calculator or paper

4521 - 2738

438 + 585

Should it take two seconds ??? For me it takes me like 30 seconds and I am college educated ... Is something wrong with me ???
 
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