Digital deck · 1st Grade · 30 questions
Missing Addends to 20 Digital Activity | 1st Grade
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Missing Addends 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
- Includes crossing-ten hidden numbers
- Add-it-back check
- Keys give the hidden part, so you can check by adding it back to 13 or 5
- 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
- Hidden-number problems help children see addition and subtraction as one idea. The bundle's games and cards give many chances.
The problem
13 + ? = 18, and the answer is 31
A hidden number within 20 is harder than within 10, because counting up on fingers runs out and the sums cross ten.
Adding the numbers shown
In 13 + ? = 18, a child adds 13 and 18 and writes 31. The 18 is the total, not a part.
Counting up past ten
5 + ? = 11 crosses ten. Counting up from 5 on fingers is slow and easy to miscount.
Not seeing the subtraction
18 - 13 gives the missing number. Few first graders see that a hidden-number problem and a take-away problem match.
Each item gives a part and a total and asks for the other part. Children count up in chunks, use a fact they know or subtract, and check by adding.
What’s inside
30 questions, one per slide.
Students type straight into the box — no printing, no cutting.
Missing Addends 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
Find the missing addend within 20
Count up or subtract, then check.
- 13 + ? = 18
- 5 + ? = 11
- 12 + ? = 17
- 3 + ? = 20
- 1 + ? = 18
- 13 + ? = 15
- 3 + ? = 14
Who it’s for
Built for the kitchen table and the classroom.
Parents & homeschool
Put counters under a cup. Say there are 18 in all, show 13, and ask how many are hiding.
Teachers
Fits first grade after addition to 20. Use bingo and games for centers.
Fact-family thinking
A good set for linking addition and subtraction.
Questions
Before you buy.
Do children need subtraction first?
No. Counting up works, and the problems also invite subtraction.
Do the sums cross ten?
Yes. Problems like 5 + ? = 11 cross ten, so children use more than finger counting.
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.
Find the hiding part
Missing Addends to 20 for 1st grade, ready to assign.
Get it — $4.50