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# How do I quickly simplify 4875/6500 Watch

1. Doing some psychometric tests and got this question (not allowed a calculator) :

A driver saved £487.50 on his car insurance bill of £650 as a result of his no claims bonus; what percentage discount does this represent?

The answer suggests doing 4875/6500 which is 3/4 as hcf is 1625. How on Earth do you figure this out quickly unless it jumps out at you that its going to be 3/4?
2. (Original post by 2cool)
Doing some psychometric tests and got this question (not allowed a calculator) :

A driver saved £487.50 on his car insurance bill of £650 as a result of his no claims bonus; what percentage discount does this represent?

The answer suggests doing 4875/6500 which is 3/4 as hcf is 1625. How on Earth do you figure this out quickly unless it jumps out at you that its going to be 3/4?
Start by finding common factors, e.g 25. And work your way through
3. (Original post by 2cool)
Doing some psychometric tests and got this question (not allowed a calculator) :

A driver saved £487.50 on his car insurance bill of £650 as a result of his no claims bonus; what percentage discount does this represent?

The answer suggests doing 4875/6500 which is 3/4 as hcf is 1625. How on Earth do you figure this out quickly unless it jumps out at you that its going to be 3/4?
divide by obvious stuff eg 25

Then spot other things like 5

Then divide by 13

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