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how do you estimate decimals?

6.3*7.8 how do I estimate the decimals
 

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Teodor M. | A++ Perfect Grade Math Science ACT ASVAB GRE GMAT FRE/SPAA++ Perfect Grade Math Science ACT ASVAB...
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6.3 * 7.8 are both 2 significant digits and 6.3 is more than 6 7.8 in almost 8 meaning it is over 48. The answer is 49.