13 skills · answer key on every sheet
3rd 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. 3-Digit Addition
Adding three-digit numbers with regrouping in one or both columns.
When: Third grade.
Watch for: Regrouping the ones correctly, then forgetting the carried digit when the tens also cross ten.
10 sets · 20 problems each
Next: Three-digit subtraction.
2. 3-Digit Subtraction
Three-digit subtraction with regrouping, including across a zero.
When: Third grade.
Watch for: Regrouping across a zero — 400 − 137 stalls because there is nothing in the tens column to borrow from.
10 sets · 20 problems each
Next: Multi-digit multiplication.
3. Area and Perimeter of Rectangles
Area is the flat space a rectangle covers, in square units. Perimeter is the distance around its edge, in units.
When: Third grade, after the multiplication facts.
Watch for: Mixing the two up: multiplying when asked for the distance around, or adding all four sides when asked for the space inside.
10 sets · 12 problems each
Next: Using the same ideas with bigger numbers and unknown sides in fourth grade.
4. Division: 2 to 5
Dividing by 2, 3, 4, and 5 with no remainder.
When: Middle of third grade, right after the matching multiplication facts.
Watch for: Reading 12 ÷ 3 as 3 ÷ 12, or answering 36 by multiplying out of habit.
10 sets · 20 problems each
Next: Division by 6 to 12.
5. Division: 6 to 12
Dividing by the larger single-digit numbers and by 10, 11, 12.
When: Late third grade.
Watch for: Guessing and checking one number at a time instead of recalling the related multiplication fact.
10 sets · 20 problems each
Next: Multi-digit multiplication in fourth grade.
6. Elapsed Time
Finding how much time passed between a start and an end, or the end time when you know the start and how long it lasted.
When: Third grade.
Watch for: Subtracting hours and minutes separately and getting stuck when the minutes pass 60. Jump to the next hour first.
10 sets · 12 problems each
Next: Time word problems.
7. Fact Families: Multiply and Divide
Seeing 4, 6, and 24 as one family: 4×6, 6×4, 24÷4, 24÷6.
When: Middle of third grade.
Watch for: Writing 4 ÷ 24 for one of the divisions — the product must come first.
10 sets · 20 problems each
Next: Fractions.
8. Fractions: Parts of a Whole
Understanding a fraction as equal parts of one whole: the bottom number says how many equal parts, the top number says how many we mean.
When: Third grade, the first time children meet fractions as numbers.
Watch for: Using the number of unshaded parts as the bottom number. The bottom number counts all the equal parts, shaded or not.
10 sets · 12 problems each
Next: Equivalent fractions in fourth grade.
9. Multiplication and Division Word Problems
Stories about equal groups: how many in all, how many in each group, or how many groups.
When: Third grade, alongside the multiplication and division facts.
Watch for: Multiplying every time because the story has two numbers. Decide what is unknown: the total (multiply), the size of each group (divide), or the number of groups (divide).
10 sets · 12 problems each
Next: Multi-step word problems in fourth grade.
10. Multiplication: 10 to 12
Facts with 10, 11, and 12.
When: Late third grade.
Watch for: Applying the 11s trick (11 × 3 = 33) past 9, so 11 × 12 gets written as 1112.
10 sets · 20 problems each
Next: Division.
11. Multiplication: 2 to 5
Multiplication facts with factors from 2 to 5.
When: Early third grade.
Watch for: Skip counting up from zero for every fact — correct but too slow to support division and fractions later.
10 sets · 20 problems each
Next: Facts 6 to 9.
12. Multiplication: 6 to 9
The harder half of the multiplication table.
When: Middle of third grade.
Watch for: Confusing 7 × 8 and 6 × 9 — both hover near 56 and 54, and neither has an obvious pattern to fall back on.
10 sets · 20 problems each
Next: Facts 10 to 12, then division.
13. Rounding to the Nearest 10 or 100
Rounding a whole number to the nearest 10 or 100 by finding which multiple it is closest to.
When: Third grade.
Watch for: Looking at the wrong digit, or always rounding down. A digit of 5 or more rounds up.
10 sets · 20 problems each
Next: Rounding larger numbers in fourth grade.
Common Core State Standards © 2010 National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.