13 skills · answer key on every sheet
1st Grade Math Worksheets
Every sheet below prints on plain letter paper and comes with its answer key on the second page. The problems are checked against the standard on the label — a sheet labeled for regrouping only contains problems that actually require regrouping.
1. 10 More, 10 Less
Finding 10 more or 10 less than a two-digit number without counting by ones: only the tens digit changes.
When: First grade.
Watch for: Changing the ones digit as well. 10 more than 34 is 44: the tens change and the ones stay.
10 sets · 20 problems each
Next: Adding and subtracting multiples of 10.
2. Addition With Regrouping to 20
Adding within 20 when the ones cross a ten — 8 + 5, 7 + 6.
When: Middle of first grade.
Watch for: Counting on from the smaller number (5 + 8 counted as five, then eight steps), which is slow and error-prone.
10 sets · 20 problems each
Next: Subtraction with borrowing to 20.
3. Addition Within 20
Adding within 20 in cases that do not cross a ten — 12 + 3, 5 + 4.
When: Early first grade.
Watch for: Adding the tens digit into the ones, so 12 + 3 becomes 6 (1 + 2 + 3).
10 sets · 20 problems each
Next: Addition with regrouping to 20.
4. Addition Word Problems
Reading a short story about putting groups together and deciding that it is an addition problem.
When: Through first grade, once adding within 20 feels comfortable.
Watch for: Adding the two numbers in the story without checking what the question asks. Read the last sentence first: it says what you are looking for.
10 sets · 12 problems each
Next: Subtraction word problems, where the story takes some away.
5. Comparing Two-Digit Numbers
Comparing two-digit numbers with the tens first, then the ones, and writing >, < or =.
When: First grade.
Watch for: Looking only at the ones digit, so 29 seems bigger than 41 because 9 is bigger than 1. The tens come first.
10 sets · 20 problems each
Next: Place value to hundreds in second grade.
6. Fact Families: Add and Subtract
Seeing that 3, 5, and 8 make four related facts: 3+5=8, 5+3=8, 8−3=5, 8−5=3.
When: Middle of first grade.
Watch for: Writing the two additions correctly, then writing 3 − 5 and 5 − 8 for the subtractions — the largest number must start the subtraction.
10 sets · 20 problems each
Next: Place value: tens and ones.
7. Missing Addend
Finding the unknown part when the total and one part are given: 7 + ___ = 12.
When: Second half of first grade.
Watch for: Adding the two visible numbers, answering 19 for 7 + ___ = 12. The equals sign is read as "the answer comes next" rather than "the same amount".
10 sets · 20 problems each
Next: Fact families.
8. Number Bonds to 20
Pairs that make each number up to 20.
When: Throughout first grade.
Watch for: Knowing bonds to 10 solidly but starting over from scratch for the teens, rather than using 10 as a landmark.
10 sets · 20 problems each
Next: Missing addend problems.
9. Place Value: Tens and Ones
Reading a two-digit number as a count of tens plus a count of ones.
When: Second half of first grade.
Watch for: Reading 47 as "four and seven" rather than "forty and seven", which later makes column addition look arbitrary.
10 sets · 20 problems each
Next: Addition within 100.
10. Subtraction With Borrowing to 20
Subtracting within 20 when the ones digit is too small — 15 − 8, 13 − 7.
When: Second half of first grade.
Watch for: Subtracting the smaller ones digit from the larger regardless of position: 15 − 8 answered as 13, from 8 − 5 = 3.
10 sets · 20 problems each
Next: Fact families, which tie addition and subtraction together.
11. Subtraction Within 20
Subtracting within 20 in cases that do not need borrowing — 17 − 4, 19 − 6.
When: Early first grade.
Watch for: Counting back one at a time and losing the count somewhere in the middle.
10 sets · 20 problems each
Next: Subtraction with borrowing to 20.
12. Subtraction Word Problems
Reading a story where some are given away or fall off and finding how many are left.
When: The second half of first grade, after subtracting within 20.
Watch for: Adding the two numbers because both appear in the story. Words like “gives away” and “fall off” mean the amount gets smaller.
10 sets · 12 problems each
Next: Two-step word problems in second grade.
13. Telling Time: Hours and Half Hours
Telling time on a clock to the hour and the half hour.
When: First grade.
Watch for: Mixing up the two hands. The short hand names the hour; the long hand says how far past the hour it is.
10 sets · 12 problems each
Next: Telling time to 5 minutes in second grade.
Common Core State Standards © 2010 National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.