1st grade math worksheets & charts
First grade builds addition and subtraction within 20 and stretches counting past 100 — the famous "count to 120" year.
The 1st grade year at a glance
First grade is where counting turns into arithmetic. Children move from counting every object to counting on from a number, then to knowing small sums outright. The year covers addition and subtraction within 20, place value inside two-digit numbers, and the first deliberate mental-math strategies — making ten, using doubles, and finding ten more or ten less without counting at all. It is also the year of counting to 120 rather than 100, which sounds arbitrary but is not: crossing 100 forces a child to see the pattern rather than lean on a memorized list.
What 1st grade math covers
- Counting, reading and writing numbers to 120
- Addition and subtraction facts within 20
- Place value: tens and ones inside two-digit numbers
- Ten-more and ten-less without counting
- Hopping along number lines to add and subtract
Where it usually gets stuck
Two things reliably slow first graders down. The first is the teen numbers, which in English are genuinely irregular — "fourteen" says the four first, while "twenty-four" says the twenty first, and eleven and twelve say nothing useful at all. The second is counting on: a child asked to add 8 and 3 who starts from one every time is doing far more work than the problem needs. A 120 chart addresses both, because it lays the structure out visually — every row is ten, every column shares a ones digit, and moving down a row is simply adding ten.
The charts to print
Practice worksheets
Fact families +−
Addition fact family worksheets (with answer key)
Counting 1–20
Counting worksheets (1–20) (with answer key)
Draw the hands
Clock worksheets (draw the hands) (with answer key)
Mad minute
Mad minute math (with answer key)
Thanksgiving math
Thanksgiving math worksheets (with answer key)
Make it match your child
The included addition/subtraction sheets are two-digit; for facts within 20, set the generator to 1-digit numbers.
1st grade math questions
Why do first graders count to 120 instead of 100?
Because stopping at 100 lets a child recite a memorized list without understanding it. Carrying on to 120 means passing the hundred mark and continuing the pattern, which only works if they have grasped how the tens and ones actually repeat.
When should a child stop counting on their fingers?
There is no deadline, and fingers are a legitimate tool. What matters is that fact recall gradually becomes automatic across the year. If a child still counts every sum from one by the end of first grade, practice the making-ten strategies rather than banning fingers.
What does fluency within 20 actually mean?
Answering addition and subtraction facts up to 20 accurately and without lengthy calculation — roughly within a few seconds. It does not require instant recall of every fact; second grade continues to build it.