1st grade math worksheets, differentiated at three levels
24 grade 1 skills, each as a Support, On Level and Challenge pack with its answer key: 72 packs and 442 printable pages, built to 20 Common Core codes.
One grade 1 skill at all three levels
Real pages from the time to the hour and half hour packs.
Support
Smaller numbers, a worked example and a strategy tip, on a shorter page.

On Level
The full grade-level expectation for the skill.

Challenge
Unknowns in any position, multi-step and explain-why items, plus a Show Your Thinking task with a rubric.

Every grade 1 skill in the library
Operations & Algebraic Thinking (9)
- Addition within 20 1.OA.C.6
- Subtraction within 20 1.OA.C.6
- Word problems within 20 1.OA.A.1
- Adding three numbers 1.OA.A.2
- True or false equations 1.OA.D.7
- Properties of addition 1.OA.B.3
- Subtraction as unknown addend 1.OA.B.4
- Counting on and back 1.OA.C.5
- Unknowns in equations 1.OA.D.8
Number & Operations in Base Ten (6)
- Addition within 100 1.NBT.C.4
- Counting to 120 1.NBT.A.1
- Tens and ones 1.NBT.B.2
- Comparing numbers to 99 1.NBT.B.3
- Ten more, ten less 1.NBT.C.5
- Subtracting tens 1.NBT.C.6
Geometry (2)
- Naming 2D shapes 1.G.A.1
- Halves and fourths 1.G.A.3
Measurement & Data (4)
- Comparing lengths 1.MD.A.1
- Measuring with units 1.MD.A.2
- Time to the hour and half hour 1.MD.B.3
- Reading simple data 1.MD.C.4
Also in grade 1: error-analysis pages ("Who is correct?"), a mixed review set, and a placement screener that routes each missed item to the pack to assign.
An answer key behind every worksheet
Each page of practice is followed by its key, so checking takes a minute. Challenge keys add a scoring rubric for the written response.

Grade 1 questions
How many 1st grade math skills are included?
24 skills for grade 1: 21 content skills plus error analysis, a mixed review set and a placement screener. Each comes at three levels, which makes 72 printable packs and 442 pages.
Which Common Core standards does grade 1 cover?
The grade 1 packs practice these codes: 1.G.A.1, 1.G.A.3, 1.MD.A.1, 1.MD.A.2, 1.MD.B.3, 1.MD.C.4, 1.NBT.A.1, 1.NBT.B.2, 1.NBT.B.3, 1.NBT.C.4, 1.NBT.C.5, 1.NBT.C.6, 1.OA.A.1, 1.OA.A.2, 1.OA.B.3, 1.OA.B.4, 1.OA.C.5, 1.OA.C.6, 1.OA.D.7, 1.OA.D.8. Each pack practices the part of its standard named in its title.
What is the difference between Support, On Level and Challenge?
Support uses smaller numbers, a worked example and a shorter page. On Level is the grade-level expectation. Challenge moves the unknown, adds steps and asks students to explain, with a rubric on the key.
Can I buy only grade 1?
The library is sold as the full Grades 1-5 set for $97, which suits teachers who differentiate across grade levels, homeschool families and tutors. The free sampler lets you check the format first.
Each pack practices the part of its standard named in its title. This is practice and review, not a full grade 1 curriculum.