Question

find the least number, which should be added to 1000 that the sum is exactly divisible by 45
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Answer 1

Divide 1000 by 45 to get 22.2.

The next higher number is 23.

Multiply 23 by 45 to get 1035

From 1035 deduct 1000 to get 35. So you need to add 35 to 1000 to make the new number 1035 divisible by 45.

Answer = 35.