Can I change how many problems are on the page?

Yes — the generator takes 10, 20 or 30 problems. Twenty is the default because it fits one page and suits a 10-minute drill.

Are these harder than normal problems?

For the same numbers, yes, roughly twice as slow at first. The gap closes quickly with a few short sessions of 10 minutes.

How many different sheets can I make?

As many as you want. The numbers are randomised each time, so printing five sheets in a row gives five different sets of 20 problems on the same skill.

What should I do when my child is stuck?

Ask what would fill the gap, not what the answer is. Try a number, see whether the two sides balance, and adjust — that is the whole method in one sentence.

Worksheets › number bonds to ten

Make 10 Worksheets

This page makes free printable make 10 worksheets on demand: press the button and you get a new sheet of 20 problems with a matching answer key, ready for US Letter or A4 paper. Right now the generator is set to problems such as 6 + □ = 10 (answer 4) and 7 + □ = 10 (answer 3); press the button again and the numbers change while the skill stays the same.

📄 MAKE 10 WORKSHEETS — A NEW SHEET EVERY TIME YOU PRESS THE BUTTON

🎲 New set of problems

‘New set of problems’ opens the generator in its own tab. There you can change the problem count and turn the answer key on or off. ‘Print or save as PDF’ opens the print dialog — choose Save as PDF in the printer list to keep the file. The sheet fits US Letter and A4, and the answer key prints on its own page.

What these worksheets cover

These problems are the first real algebra a child meets. The empty box is a variable in everything but name, and children who are comfortable with 7 + □ = 10 tend to find equations far less strange two or three years later.

The sheet mixes the position of the missing value, so the box sometimes sits in the first slot and sometimes in the answer slot. Children who have only met one arrangement usually stall on the other.

The sheet uses pairs that make ten, so the difficulty is the reasoning, not the arithmetic.

A missing-number problem such as 6 + □ = 10 asks the child to work backwards, and that is a genuinely different skill from computing forwards. The answer 4 cannot be reached by reading left to right and doing what the sign says.

These make 10 worksheets are commonly aligned with the operations and algebraic thinking strand for this grade, and the skill appears in most curricula somewhere around this point.

Sample problems from the current sheet

These six come from the sheet loaded on this page. Press the button and the numbers change, but the shape stays the same (pairs that make ten).
#	Problem	Answer	What to check
1	6 + □ = 10	4	Watch for: guess-and-check without adjusting
2	7 + □ = 10	3	Check: treating the equals sign as 'the answer comes next'
3	8 + □ = 10	2	Look at: ignoring the box and computing the two visible numbers
4	5 + □ = 10	5	Ask about: writing the whole equation as the answer
5	4 + □ = 10	6	Watch for: using the same operation instead of the inverse
6	3 + □ = 10	7	Check: freezing when the box is first

Try one together first

Try 8 + □ = 10 together before letting the child start alone. The answer to 8 + □ = 10 is 2, and talking through how it was reached takes about a minute and saves several minutes of guessing later in the sheet.

The item 7 + □ = 10 is worth doing slowly. The answer to 7 + □ = 10 is 3, and the route to it is the route every other problem on this sheet takes — which is why the sheet has 20 of them rather than one.

Three common mistakes and what to do about them

Writing the whole equation as the answer
Younger children sometimes copy the line instead of writing the missing value. Ask for a single number, and check it against 2.
Guess-and-check without adjusting
Guessing is a legitimate first move, but the child has to use whether the guess was too big or too small. Guessing again at random turns a 30-second problem into a two-minute one.
Treating the equals sign as 'the answer comes next'
This misconception is invisible on ordinary sheets and fatal here. The equals sign means the two sides balance, and missing-number work is where that finally has to be understood.

A 10-minute routine that works

Keep the session to about 10 minutes. A child working at this level who is still counting on fingers will need longer than that on a line like 6 + □ = 10, and that is fine: the timer is a measurement, never a punishment.
Read the first two problems out loud together before starting the clock. It costs fifteen seconds and removes most of the 'I did not understand the question' errors.
Run the sheet at the same time each day. Ten focused minutes before dinner beats an hour on Sunday, because number bonds to ten is a recall skill: 6 + □ = 10 has to arrive without being worked out, and recall is built by frequency.
Re-print the same skill rather than the same sheet. Because the numbers change, a child who memorised that 6 + □ = 10 gives 4 still has to actually calculate tomorrow.
Write the finish time and the score at the top of every sheet. Two weeks of those two numbers tells you more about progress on number bonds to ten than any single test result.

Marking the sheet

The answer key is generated with the worksheet, not written by hand, so it always matches the sheet in front of you — 6 + □ = 10 is listed as 4, 7 + □ = 10 as 3, and so on down the page.

Every generated sheet carries its own key on a separate printed page, which lets a child self-mark without seeing the answers while they work.

Printing on US Letter or A4

The sheet is laid out to fit one page on both US Letter and A4. Leave the browser scaling at 100% and turn headers and footers off, and the 20 problems land inside the margins on either paper size.

If the problems look cramped, drop the count from 20 to a smaller number before printing these make 10 worksheets; the font stays the same size and the spacing opens up.

Frequently asked questions

Can I change how many problems are on the page?: Yes — the generator takes 10, 20 or 30 problems. Twenty is the default because it fits one page and suits a 10-minute drill.
Are these harder than normal problems?: For the same numbers, yes, roughly twice as slow at first. The gap closes quickly with a few short sessions of 10 minutes.
How many different sheets can I make?: As many as you want. The numbers are randomised each time, so printing five sheets in a row gives five different sets of 20 problems on the same skill.
What should I do when my child is stuck?: Ask what would fill the gap, not what the answer is. Try a number, see whether the two sides balance, and adjust — that is the whole method in one sentence.

Print a sheet of make 10 worksheets, run it for 10 minutes, mark it together, and come back tomorrow for a different set of numbers on the same skill.

More worksheets like this

→ Free Missing Number Worksheets

Free printable math worksheets from a working math academy director in Korea. Problems come from our own code, not from a published workbook. Every sheet prints on US Letter or A4 with its answer key. All worksheets · Worksheet generator · Korean site
Last updated: 2026-09-13