Fill in the missing numbers in counting sequences to 20 and to 100, and find the missing number in addition facts. There are 4 sheets here: missing numbers to 20, missing numbers to 100, missing addends and hundreds chart gaps. Pick one from the tray, print it, and add its answer key as a second page if you want one.
Worksheets
NameDate
Missing numbers to 20
Count on and fill in each missing number.
, 6, 7, 8, 9, , , 12
, 4, , 6, 7, 8, 9,
9, , 11, , 13, , 15, 16
5, , , 8, , 10, 11, 12
6, 7, 8, , , 11, , 13
7, , 9, , , 12, 13, 14
1, , 3, 4, 5, , 7,
, 1, 2, , , 5, 6, 7
, , 3, 4, 5, 6, , 8
7, 8, 9, 10, , , 13,
9, 10, 11, 12, , 14, ,
4, 5, 6, , 8, , 10,
Using these sheets
New problems gives the same kind of sheet with different numbers, so you can print one for class and another for homework.
The answer key matches the sheet on screen, including after you make new problems.
Sheets print on US Letter paper. On A4, choose “Fit to printable area” in the print dialog.
Questions
What grade are these missing numbers worksheets for?
They suit kindergarten to grade 2. The sheets in the tray go from easier to harder, ending with hundreds chart gaps.
Is there an answer key?
Yes. Tick “add the answer key as page 2” before printing, or turn on Answer key to check work on screen.
Can I print more than one version?
Yes. Press New problems for a fresh set of the same kind, then print again. The answer key changes with it.
Do I need an account to print?
No. The sheets print straight from this page, free, with no sign-up.