Two-digit ± one-digit, with regrouping
Two-digit ± one-digit, with regrouping helps children practise adding or subtracting a single digit across a ten boundary — for example 47 + 6 = 53 or 53 − 6 = 47. Read the short guide and look through the examples before choosing online practice or a printable worksheet.
How to solve this
- When a ones digit goes above 9 or below 0, you must carry into or borrow from the tens.
- For addition: if ones sum to 10 or more, write the ones digit and carry 1 ten to the left. For subtraction: borrow 10 from the tens when ones are not enough.
- Check by using the inverse operation: add and subtract should undo each other.
Examples
46 + 7 = ?
53
82 - 25 = ?
57
34 + 21 = ?
55