Question

Fill in the smallest digit to make the number divisible by 11 :

[4x2=8]

a. 86...53

b. 40...5

c. 618....

d.1059....​

Answer 1

Answer:

a. 5

b. 1

c. 3

d. 3

Step-by-step explanation:

you can tell that a number is divisible by 11 if all the sum of all odd place digits and the even place digits' difference is divisible by 11.

a. 8+x+3 = 6+x

   6+5 = 11.

    if x = 5, the difference will be 0. 11x0=0.

b. 4+x = 4+x

    0+5 = 5

    5  - 5 = 0.

    if x=1, the difference will be 0. 11x0=0

c. 6+8=14

   1+x=1+x

   14 - 3 = 11. 1x11=11.

d. 1+5+x=6+x

   0+9=9

    9-9=0. (if x=3) 11x0=0

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