Digital deck · 1st Grade · 30 questions
Subtraction to 20 Digital Activity | 1st Grade
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Subtraction to 20 for 1st grade: 30 question slides with a type-in answer box, plus an answer key slide.
What’s inside this download
- 30 question slides, one question per slide
- A type-in answer box on every question
- A title slide and an answer key slide at the end
- One .pptx file — opens in Google Slides and PowerPoint
Why choose this over a free activity
- Close numbers and crossing ten
- Count back or count up
- Keys give each difference, so a miscount while crossing ten is easy to find
- No printing — works on a laptop, tablet or classroom screen
License and file format
- One .pptx file; upload it to Google Drive to open it in Google Slides
- One teacher or one household. Use it with your own students, this year and next
- Sharing the file itself needs a separate license
- Digital download — nothing ships
How do I get the files?
- The download link is on the order page the moment you pay, and in your inbox at the same time
- Re-download from that link any time — no account needed
- Wrong or broken file? Email support@pencillane.com and we fix it or refund you
Why get the bundle
- Subtraction to 20 benefits from practice in many forms. Bingo, color-by-code and cards give children a lot of looks.
The problem
12 - 11: don't count back eleven
Counting back works for small take-aways, but it fails when the two numbers are close or when the numbers get bigger.
Counting back every time
For 12 - 11 a child counts back 11 steps and lands on the wrong number. Counting up from 11 is faster.
Crossing ten
13 - 5 asks a child to pass through 10. Counting back loses its place.
Not using addition
15 - 9 can be solved by thinking 9 + ? = 15. Most children do not see the link without help.
Facts to 20 give children a choice: count back for small take-aways, count up for close numbers. Each page supports both.
What’s inside
30 questions, one per slide.
Students type straight into the box — no printing, no cutting.
Subtraction to 20
Written for 1st grade.
Title to answer key
A title slide first, the answer key last.
Google Slides & PowerPoint
One .pptx file that opens in both.
Look inside
One question per slide, with a box to type the answer.
How it works
Ready before the printer warms up.
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1
Download
Check out, and your download link is in your inbox and on screen in seconds. One PowerPoint file you can open in Google Slides.
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2
Open
Upload it to Google Drive and open it with Google Slides, or open it in PowerPoint.
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3
Assign
Share it with your class. Students type an answer on each slide, and you check against the key.
Outcomes
Subtract within 20
Count back, count up, or use an addition fact.
- 7 − 5
- 7 − 6
- 12 − 11
- 18 − 8
- 13 − 5
- 10 − 8
- 14 − 11
Who it’s for
Built for the kitchen table and the classroom.
Parents & homeschool
Show 12 - 11 on a number line. Ask: is it closer to count back or count up?
Teachers
Use in first grade after addition to 20. Games and cards make good centers.
Fact fluency
The step between early subtraction and two-digit work.
Questions
Before you buy.
Is this harder than subtraction to 10?
Yes. Numbers go to 20, so crossing ten appears.
Is there a digital deck?
Yes. A Google Slides deck gives screen practice with subtraction to 20.
How do I get the file?
The download link appears right after checkout and lands in your inbox at the same time. One PowerPoint file you can open in Google Slides.
Can I share it with my class?
Yes — one teacher can use it with their own students, this year and next. Sharing the file with other teachers needs a separate license.
Do I need Google Slides?
No. The file is a PowerPoint (.pptx). It opens in PowerPoint, and in Google Slides once you upload it to Google Drive.
What if it isn’t right for us?
Email support@pencillane.com within 30 days and we refund the full $4.50. No form, no questions.
Choose the easy way to subtract
Subtraction to 20 for 1st grade, ready to assign.
Get it — $4.50