21.

In the following addition, find ‘A’.

    3 1 A
+  1 A 3
_________
     5 0 1  

Find ‘P’ and ‘Q’ in the addition.

        P
    +  P
     + P
    _____
     Q P  

Find the digits A and B.

    B A
x  B 3
_______
  5 7 A 

If the division N ÷ 5 leaves a remainder of 3, what might be the one,s digit of N?

If the division N ÷ 5 leaves a remainder of 3, what might be the one,s digit of N?

If the division N ÷ 5 leaves a remainder of 4, what might be the one’s digit of N?

If the division N ÷ 2 leaves a remainder of 1, what might be the one’s digit of N?

If the division N ÷ 2 leaves no remainder (i.e, zero remainder), what might be the one’s digit of N?

Suppose that the division N ÷ 5 leaves a remainder of 4 and the division N ÷ 2 leaves a remainder of 1. What must be the one’s digit of N?

Check the divisibility of the following number by 9.

1. 108 2. 616 3. 294

4. 432 5. 927