One Less One More Math Worksheets – Tables to 20 and 120

	1 less	Number	1 more
1.	blank	13	blank
2.	blank	18	blank
3.	blank	16	blank
4.	blank	6	blank
5.	blank	5	blank
6.	blank	9	blank
7.	blank	15	blank
8.	blank	3	blank

1 less

Number

1 more

	1 less	Number	1 more
1.	12	13	14
2.	17	18	19
3.	15	16	17
4.	5	6	7
5.	4	5	6
6.	8	9	10
7.	14	15	16
8.	2	3	4

1 less

Number

1 more

How it works

These one less one more math worksheets open on a table of numbers to 20. Each row has one number in the middle: write one less on its left and one more on its right.

Read the full guide

Start with things to count

A child who cannot say what comes before 13 needs objects first. One more with pictures, numbers to 5 prints a row of things with one more beside it; on One less with pictures: cross one out, to 5 the child crosses one out. Common Core K.CC.4c puts the idea in kindergarten: each number in the count is one larger than the last.

Then the table, then the tens

The tables print only the number, so the counting happens in the head. Move up when a sheet is easy: to 20, to 50, to 120. The hard rows sit at the tens, where one more than 39 is 40. Over the ten: one more than 9, 19, 29 and on to 99 practices only those.

If one less is harder than one more, have the child count back aloud from the number: 13, 12.
Keep a number chart to 20 beside the first sheets, and take it away when the answers come without looking.

Questions and answers

What grade are one more and one less worksheets for?

Kindergarten for numbers to 20: the Texas standards ask kindergartners to give the number that is one more or one less than another, up to at least 20, K.2(F). The tables to 50 and 120 suit first grade.

Is there an answer key?

Yes. The key prints as the last page, with every box filled in. On the picture sheets it shows the cross on the thing that was taken away. To print the sheet alone, untick Answer key before you press Print.

Why does one row ask for one less than 1?

Because the answer is 0, and children should meet it. The tables to 10 and 20 start at 1, so now and then the left-hand box holds zero. No sheet goes below zero.

What comes after one more and one less?

Ten more and ten less. Common Core 1.NBT.5 asks first graders to find them for a two-digit number in their heads, without counting. The same table works: only the tens digit changes in place of the ones.

All 16 sheet types

With things to count 5

One less with pictures: cross one out, to 5 A row of 4 things and 4 − 1 = ___ underneath. Pupils cross one out and write how many are left, 3. The key shows the cross.
One less with pictures: cross one out, to 10 Up to 10 things in rows of five. Cross one out and write how many are left: 9 − 1 = 8.
One more on a ten frame Dark counters fill part of a ten frame and one light counter sits in the next square: 6 + 1 = 7. The frame shows that one more is the very next place.
One more with pictures, numbers to 5 A row of 3 things and 1 more of the same beside it, with 3 + 1 = ___ underneath. Pupils count them all and write 4. Totals stop at 5.
One more with pictures, numbers to 10 The same picture with larger groups: 7 things and 1 more make 8. Counting on from 7 is quicker than counting all 8 again, which is the point of the sheet.

Show all 16 sheet types (11 more)

One less and one more tables 4

One less and one more table, numbers to 10 The same table for numbers from 1 to 9: one less than 6 is 5 and one more is 7. One less than 1 is 0, so zero can turn up in the left-hand box.
One less and one more table, numbers to 20 The sheet the page opens on. Each of its 8 rows prints one number in the middle, such as 13, with a box on the left for one less (12) and a box on the right for one more (14). Numbers run from 1 to 19. Texas asks kindergartners for exactly this, up to at least 20: K.2(F).
One less and one more table, numbers to 50 Numbers from 20 to 49. Most rows change only the ones digit, but 30 has 29 before it and 39 has 40 after it, so the tens digit has to change too.
One less and one more table, numbers to 120 Numbers from 50 to 119, the range in which Common Core has first graders count, read and write (1.NBT.1). One more than 99 is 100 and one less than 110 is 109.

In words, as sums and turned round 5

One less than a number, in words One less than 12 is ___. Numbers go up to 20, and the key writes the subtraction beside each sentence, 12 − 1 = 11.
One more than a number, in words Sentences to finish: One more than 7 is ___. Numbers go up to 19, so the largest answer is 20. The key writes the sum beside each sentence, 7 + 1 = 8.
Plus 1 and minus 1 as sums, numbers to 20 One more and one less written with signs: 14 + 1 = 15 and 14 − 1 = 13 are shuffled on one page, so pupils must read the sign before they answer.
Turned round: which number is one less? The sum is printed and the first number is a blank, as in 7 + 1 = 8 with the 7 missing. The number that is one less than 8 goes in the blank.
Turned round: which number is one more? The other way round: 13 − 1 = 12 with the 13 missing. The number that is one more than 12 goes in the blank.

Over the ten 2

Back over the ten: one less than 10, 20, 30 and on to 100 Every number is a whole ten, so one less drops into the ten before: one less than 60 is 59, and one less than 100 is 99. Ten sentences, one for each ten from 10 to 100.
Over the ten: one more than 9, 19, 29 and on to 99 Every number ends in 9, so one more always starts a new ten: one more than 39 is 40, and one more than 99 is 100. Ten sentences, one for each number from 9 to 99.

How this list was compiled: Own list of sheet types, written September 2026; every worked example was computed twice by script on 2026-09-30. Grades were checked the same day in the full text of the Common Core State Standards for Mathematics (California Department of Education copy, https://www.cde.ca.gov/be/st/ss/documents/ccssmathstandardaug2013.pdf): K.CC.4c (each successive number name refers to a quantity that is one larger) and 1.NBT.1 (count to 120, starting at any number less than 120); and in the Texas Essential Knowledge and Skills for Mathematics (https://tea.texas.gov/sites/default/files/ch111a.pdf): kindergarten, K.2(F) (generate a number that is one more than or one less than another number up to at least 20). Licence: own work