Free printable practice
Subtract Vertical Within 20 Practice Activities
Printable preschool and kindergarten subtraction worksheets help children solve vertical subtraction problems within 20 with clear number alignment.
Practice that builds confidence
Understanding vertical subtraction within 20
These printable subtraction activities help preschool and kindergarten children practise vertical subtraction within 20. Children learn to read a stacked number sentence, subtract the bottom number from the top number, and write the answer in the correct place.
The worksheets include focused practice with numbers up to 20, using a clean vertical layout that supports careful counting, number sense, and early written maths habits. They are useful after children have explored subtraction with objects, fingers, drawings, or number lines.
Vertical subtraction shows one number above another, with a minus sign and a line for the answer. At this early stage, the main goal is not speed. Children are learning what the layout means: start with the top number, take away the bottom number, and record how many are left. Problems stay within 20 so children can use counting, mental images, fingers, counters, or simple drawings to check their thinking.
Building from concrete to written work
Before using the page, let your child act out a problem such as 15 - 6 with 15 counters, buttons, or cereal pieces. Remove 6, count what remains, then connect that action to the vertical problem on the worksheet. This helps children see that the written form is just another way to show “take away.” Over time, children may move from counting all the remaining objects to counting back from the top number.
A simple parent routine
Choose a small set of problems rather than rushing through the whole sheet. Ask your child to point to the top number and say, “I start with ___.” Then point to the bottom number and say, “I take away ___.” After solving, have the child read the complete subtraction sentence aloud. If an answer seems off, invite them to check with counters or by counting back, rather than simply correcting it for them.
Classroom uses for teachers
Teachers can use these worksheets during subtraction review, small-group instruction, morning work, or math centers. They also work well as a bridge between hands-on subtraction mats and independent written practice. Because the problems are arranged vertically, teachers can quickly observe whether students understand the operation and whether they can place the answer neatly under the problem.
Common errors to watch for
Some children subtract the top number from the bottom number because they read downward without thinking about the action. Others add the two numbers, copy one of the numbers as the answer, or miscount when using fingers. Children may also write answers too far from the line. Encourage them to circle the top number first, touch each number as they explain, and keep the answer under the line.
Free printable PDF download
Use this subtract vertical within 20 worksheet page to preview the activity, print it, or download it as a PDF for quick practice. It works well for homework, homeschool lessons, tutoring, morning work, revision, and classroom centers.
Answers and answer key support
After the child completes the worksheet independently, parents and teachers can use the answer support or answer key information to check the work, review mistakes, and choose the next practice step.
Why iBloom worksheets help
This iBloom collection keeps the practice focused on one skill: subtracting vertically within 20. The uncluttered format reduces distraction, while repeated examples help children build confidence with the structure of subtraction. A child-friendly strategy is: “Top number first, take away the bottom, count what is left, then write it below the line.”
Helpful answers
Frequently asked questions
What does vertical subtraction within 20 mean?
It means the subtraction problem is written in a stacked format, with one number above another, and all starting numbers and answers stay within 20.
Is this worksheet collection suitable for preschool children?
Yes, it can be used with preschool children who already understand simple take-away situations with objects. Many kindergarten children will also use it for written subtraction practice.
Should children solve these problems mentally?
Not necessarily. Children may use fingers, counters, drawings, or counting back. The goal is to understand the subtraction action and the vertical layout.
How can I help if my child keeps adding instead of subtracting?
Have your child say the problem as a take-away story, such as “I have 14 and take away 5.” Using real objects often helps them connect the minus sign to removing.
Why practise subtraction in a vertical format so early?
Vertical practice helps children recognize another common way subtraction is written. It also builds careful number alignment before they meet larger subtraction problems later.
Is this subtract vertical within 20 worksheet free?
Yes. You can preview it for free and use the printable worksheet for home or classroom practice.
Can I download this subtract vertical within 20 worksheet as a PDF?
Yes. Use the worksheet download option to save a printable PDF, or print the worksheet directly from the page.
Does this subtract vertical within 20 worksheet include answers or an answer key?
When the activity has fixed answers, iBloom includes answer support so parents and teachers can check the completed worksheet.