Question

9. Replace X by a digit so that the number is divisible by 9.
a) 8826X21 b) 1454X4 c)
2944X4
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Answer 1

Answer:

Do like this you will get your (b),(c) very easily

Step-by-step explanation:

first add the place of odd digit =8+2+x+1=11.

then add the place of even digit= 8+4+4= 16.

Sum of odd and even digit= 11+16 = 27.

add =0 digit to divisible by 9 = 9÷ (8+8+2+6+0+2+1)=27, then 8826021 is divisible by 9.

Answer 2

Answer:

a) X= 0 or9

b) X= 0or9

c) X=4

Step-by-step explanation:

Any number will be divisible by 9 if the sum of all digits of number should be divisible by 9.

a) 8+8+2+6+X+2+1 = 27+X

here X=9 or 0

because 27+9=36 which is divisible by 9

(b) similarly 1+4+5+4+X+4= 18+X

here X can either be 0 or 9

(c) 2+9+4+4+X+4= 23+X

here X =4