Free printable practice
Vertical Under 20 Practice Activities
Maths drill worksheets for vertical subtraction facts under 20, helping children practise aligned, accurate take-away calculations.
Practice that builds confidence
What Vertical Subtraction Builds
These Mathematics worksheets give children focused practice with vertical subtraction facts under 20. Each problem is arranged in columns so learners can subtract the lower number from the upper number while keeping digits aligned.
The printable activities are useful for building speed and accuracy with basic take-away facts. Children practise subtracting within 20, reading the minus sign, writing answers in the correct place, and checking whether the result is reasonable.
Vertical subtraction helps children see a calculation as a structured problem. In facts under 20, the numbers are small enough for mental strategies, fingers, number lines, or objects, but the column layout prepares children for later multi-digit subtraction. A problem such as 17 - 8 asks the child to find what is left after taking away 8 from 17.
Skill Progression
Practice may begin with facts that do not require crossing ten, such as 9 - 4 or 14 - 3. It can then include facts like 13 - 7 or 16 - 9, where children need to bridge through 10 or count up from the smaller number. Because the format is vertical, children also learn to place the answer below the line, not beside the numbers.
Parent Routine
Choose one short set and ask your child to read each problem aloud: "eighteen minus six." For tricky facts, use a number line from 0 to 20, counters, or backward counting. After solving, ask, "Is the answer smaller than the top number?" This quick check catches many careless mistakes.
Classroom Uses
Teachers can use these worksheets for maths drills, morning practice, small-group fluency work, or revision after teaching subtraction strategies. They also make good exit tasks: give five problems and ask children to mark which ones they solved by counting back, making ten, or recalling a fact.
Common Errors to Watch
Children sometimes add instead of subtracting, reverse the order as 8 - 17, misread the minus sign, or write the answer in the wrong column. Some count the starting number as the first count-back step, which makes the answer one too small. Encourage slow pointing and clear language: start at 17, take away 8, stop at the answer.
Free printable PDF download
Use this vertical subtraction under 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
The pages keep the range under 20, so children can concentrate on subtraction facts and vertical layout together. A child-friendly strategy is: read the top number, read the take-away number, count back or make ten, then check that the answer is less than the starting number.
Helpful answers
Frequently asked questions
What does vertical subtraction under 20 mean?
It means subtraction problems with numbers below 20 are written one number above the other, with the answer placed below the line.
Do these worksheets include borrowing or regrouping?
No. These are subtraction facts under 20, so the focus is basic fact fluency and correct vertical layout rather than formal regrouping.
How can a child solve 16 minus 9 without guessing?
They can count back 9 steps from 16, count up from 9 to 16, or use make-ten thinking: 16 - 6 = 10, then 10 - 3 = 7.
Why is my child adding the numbers instead?
Some children focus on the two numbers and miss the minus sign. Ask them to circle the sign first and say "take away" before solving.
How should I check answers in subtraction drills?
The answer should be smaller than the top number unless subtracting zero. Children can also add the answer and the subtracted number to see if they get the starting number.
Is this vertical subtraction under 20 worksheet free?
Yes. You can preview it for free and use the printable worksheet for home or classroom practice.
Can I download this vertical subtraction under 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 vertical subtraction under 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.