10 printable sets · answer key on every set

Subtraction With Borrowing to 20 Worksheets

CCSS 1.OA.C.6
20 problems per set
Answer key included

What this skill is

Subtracting within 20 when the ones digit is too small — 15 − 8, 13 − 7.

When it comes up: Second half of first grade.

The mistake to watch for

Subtracting the smaller ones digit from the larger regardless of position: 15 − 8 answered as 13, from 8 − 5 = 3.

How to help

Go through ten. For 15 − 8, take 5 to land on 10, then 3 more. Two easy steps beat one hard one.

Next: Fact families, which tie addition and subtraction together.

A worked example

Try 15 − 8. You cannot take 8 from the 5 ones, so use the ten: take away 5 to reach 10 (15 − 5 = 10), then take away the other 3 (10 − 3 = 7).

Words to know

subtract: To take one number away from another to find how many are left.
regroup: To trade 10 ones for 1 ten (or 1 ten for 10 ones) when you add or subtract.
difference: The answer you get when you subtract.
minus: The sign ( − ) that means take away.
ten: The number 10, one more than nine.

Practice

Subtract. Borrow when you need to.

Showing Set 1 · 20 problems

20 − 2 =
20 − 13 =
15 − 6 =
13 − 4 =
15 − 7 =
11 − 7 =
12 − 3 =
16 − 9 =
11 − 5 =
20 − 12 =
11 − 6 =
10 − 1 =
20 − 17 =
14 − 5 =
11 − 3 =
16 − 7 =
13 − 5 =
12 − 7 =
10 − 2 =
20 − 3 =

Download this set20 problems · answer key included PDF

Answer key

All 10 sets

Each set is a different list of 20 problems with its own answer key. Use the buttons above to look at one on this page, or download any of them as a PDF.

How these sheets were made

Problems are generated for each set and checked against 1.OA.C.6 before the sheet is built — no duplicates, and every problem falls inside the standard's number range.