The idea
Place value tells us the value of a digit from its position in a number.
Follow these steps
- Separate the number into groups of three digits.
- Locate the digit and name its column.
- Write its value by replacing all other digits with zero.
See the method in action
Example 1
In 4,336,241, what is the value of the digit in the hundred-thousands column?
- The digit 3 is in the hundred-thousands column, so its value is 3 × 100,000 = 300000.
Example 2
A digit 2 moves from the hundred-thousands column to the thousands column. By how much does its value decrease?
- First identify the relevant place-value or representation relationship.
- Then its value changes from 200,000 to 2,000; subtract to get 198,000.
- Finally, check the result against every value or position stated in the question.
A useful shortcut
Write its value by replacing all other digits with zero.
Watch out for these
Three fresh questions
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