Question

Rules to check for a number to be divisible by 7

Answer 1

Answer:

Step-by-step explanation:

u should double the ones digit and subtract it from the rest of the no.

if the subtracted no. is divisivble by 7 then the entire no. is divisible

eg. take 889

double the ones digit

u get 18

subtract 18 from 88

uget 70

70is divisible by 7

so 889 is also divisible by 7

Answer 2

Step-by-step explanation:

Double the last digit and subtract it from a number made by the other digits. The result must be divisible by 7.

(We can apply this rule to that answer again)

• 672 (Double 2 is 4, 67-4=63, and 63÷7=9) Yes

• 105 (Double 5 is 10, 10-10=0, and 0 is divisible by 7) Yes

• 905 (Double 5 is 10, 90-10=80, and 80÷7=11 3/7) No