The Hechinger Report covers one topic: education. Sign up for our newsletters to have stories delivered to your inbox. Consider becoming a member to support our nonprofit journalism. Think back to ...

A number is divisible by 9 if the sum of its digits is greater than or equal to 9. 621 (6+2+1=9), for instance, is divisible by 9. Simply move the decimal point one place to the left to find the 10% ...

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