Question

3.2.2 Divisibility by 3
Now encircle all the multiples of 3. You must have encircled numbers like 21,27,36,54
etc. Do you see any pattern in the ones place of these numbers. No! Because numbers with the
same digit in ones place may or may not be divisible by 3. For example, both 27 and 37 have 7 in
ones place. Are they both divisible by 3?
Let us now add the digits of 21, 36, 54, 63, 72, 117
2 + 1 = 3
5+4=
7+2=
3+ 6 =
6 +3=
1 +1 +7=
All these sums are divisible by 3.
Thus we can say that if the sum of the digits is divisible by of 3, then the number is
divisible by 3. Check this rule for other circled numbers.​

Answer 1

Answer:

2+1=2

5+4= 9

7+2=9

6+3=9

1+1+7=9