Question

how to test the divisibility of 7​

Answer 1

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To check if a number is evenly divisible by 7: Take the last digit of the number, double it Then subtract the result from the rest of the number If the resulting number is evenly divisible by 7, so is the original number.

Step-by-step explanation:

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Answer 2

ᴛᴏ ᴄʜᴇᴄᴋ ɪғ ᴀ ɴᴜᴍʙᴇʀ ɪs ᴇᴠᴇɴʟʏ ᴅɪᴠɪsɪʙʟᴇ ʙʏ 7: ᴛᴀᴋᴇ ᴛʜᴇ ʟᴀsᴛ ᴅɪɢɪᴛ ᴏғ ᴛʜᴇ ɴᴜᴍʙᴇʀ, ᴅᴏᴜʙʟᴇ ɪᴛ ᴛʜᴇɴ sᴜʙᴛʀᴀᴄᴛ ᴛʜᴇ ʀᴇsᴜʟᴛ ғʀᴏᴍ ᴛʜᴇ ʀᴇsᴛ ᴏғ ᴛʜᴇ ɴᴜᴍʙᴇʀ ɪғ ᴛʜᴇ ʀᴇsᴜʟᴛɪɴɢ ɴᴜᴍʙᴇʀ ɪs ᴇᴠᴇɴʟʏ ᴅɪᴠɪsɪʙʟᴇ ʙʏ 7, sᴏ ɪs ᴛʜᴇ ᴏʀɪɢɪɴᴀʟ ɴᴜᴍʙᴇʀ.