Adding and subtracting · Grade R
In Grade R you learn: adding and subtracting within 10.
Adding puts amounts together; subtracting takes away or finds the difference between two amounts. They are opposites: one undoes the other, so every subtraction can be checked with an addition. Good mental strategies (counting on, partitioning, using bonds) make both quick and reliable.
Key facts
- Find a difference by counting up from the smaller number.
- Check a subtraction by adding the answer back on.