Video Transcript
Find the number that is 1,000 less
than 2,599.
What skills do you think you need
to have to be able to find 1,000 less than a number? Perhaps you may think that the main
skill is subtraction. After all, we need to find 1,000
less than a four-digit number here. But in a way, the most important
skill that we need is a knowledge of place value. We know there’s such thing as a
thousands column or a digit in a number that’s worth 1,000. And if we know where that thousands
digit is in a number, we can work out how our number is going to change.
In this question, we’re given a
number 2,599. Now you’ve probably heard as we’ve
read that how many thousands we’ve got and which digit is in the thousands place,
but let’s write this number in a place value grid just to help us. This number contains two 1,000s,
five 100s, nine 10s, and nine ones. And if we want to find the number
that is 1,000 less than the number in our grid, we need to be looking at the digit
in the thousands place. At the moment, our number contains
two 1,000s as we’ve just said. But if we want to find the answer
that is 1,000 less than this, instead of two 1,000s, we’re going to need to show
1,000.
In this example, we found 1,000
less than a number by subtracting one from the digit in the thousands column. 1,000 less than 2,599 is 1,599.
