Question

Determine the smallest number that should be added to 1321 to make it divisible by 10. (2 marks)

Answer 1

A number is divisible by 10 if it has 0 in its ones place.
(0.5 marks)

The ones digit of 1321 is 1.

After 1321, the smallest possible number that ends with zero is 1330.
(1 mark)

1330 - 1321 = 9
(0.5 marks)

Therefore, 9 should be added to 1321 to make it divisible by 10.