The place value system controls where and when to convert a number digit. In this presentation, it will explain what place value is and how the place value house works with addition and subtraction.
When you are adding the numbers, the digit will move to the left however. This will only happen if the number you are adding is big enough to make a full ten, hundred or thousand.
If you subtract the numbers move to the right, like addition, this will only happen if the number you are subtracting is bigger than the digit place you are subtracting it in. Place value houses can also equal to decimals as well.
LI: to understand the movements within the place value system.
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