Adding & Subtracting 10, 100 & 1,000
Maths: Year 5 & 6 National Curriculum, topic 5.3.3
Adding & Subtracting 10, 100 and 1,000 in your Head
When adding or subtracting 10, 100 or 1,000 it will usually only change one column.
450 − 100 = 350
- Only changes the 'hundreds' column.
87,348 − 1,000 = 86,348
- Only changes the 'thousands' column.
3,948 − 10 = 3,938
- Only changes the 'tens' column.
Carrying over
- Adding or subtracting 10, 100 or 1,000 will usually only change one column.
- But if adding or subtracting 10, 100 or 1,000 makes the digit go past zero, it will also affect one other column.
- E.g. 195 + 10 = 205