10 and 100 More or Less

By the end of this unit, students will be able to:

1. understand the concept of “10 more” and “10 less” for two-digit numbers;
2. understand the concept of “100 more” and “100 less” for three-digit numbers;
3. use mental strategies to add or subtract 10 or 100 from a given number;
4. identify number patterns when adding or subtracting multiples of 10 and 100.