CCSS.Math.Content.2.NBT.B.6
The Standard
Add up to four two-digit numbers using strategies based on place value and properties of operations.
Common Core State Standards for Mathematics · Number and Operations in Base Ten
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students combine several two-digit numbers by adding tens and ones. They regroup ones into tens and reorder or group addends to make the work easier.
What Mastery Looks Like
- Students find an accurate total and show tens and ones clearly. They regroup when needed and choose helpful pairs, such as numbers that make a multiple of ten.
Common Misconceptions
- Students may add every digit without respecting place value, or forget to regroup 10 ones as 1 ten. Some think numbers must be combined only in the order given.
How to Assess It
- Give the exit ticket: “Find 26 + 48 + 14 + 32. Show how you grouped numbers and explain one step.”
Lesson moves
Ways to Teach It
Give groups base-ten blocks and four number cards, then have them build each number, combine the blocks, regroup, and record the total.
Ask, “Which two numbers would you add first in 27 + 35 + 13 + 25, and why?”
Play Make 100: students draw four two-digit cards, arrange and group them, then earn a point for each correct total.
Plan a class party budget by adding the costs of four items, then show a second way to group the costs.
Free download
Printable 2.NBT.B.6 Worksheet
A ready-to-print activity worksheet aligned to CCSS.Math.Content.2.NBT.B.6, with an answer key for the teacher on its own page. No account needed.
PDF, US Letter, prints cleanly in black and white.
Download the worksheetLearning progression
Where This Standard Sits
See the whole path on the Number & Operations in Base Ten progression map.
Before This Standard
If students are struggling here, check these first.
- CCSS.Math.Content.1.NBT.C.4
Adding four two-digit numbers requires combining tens and ones across addends and composing tens, first learned with two two-digit sums.
- CCSS.Math.Content.1.NBT.B.2
Adding several two-digit numbers by tens and ones requires knowing each digit’s tens or ones value.
- CCSS.Math.Content.2.OA.B.2
Fluency with one-digit sums supports combining ones and tens efficiently when adding several two-digit numbers.
Keep exploring
Related Standards
- CCSS.Math.Content.4.NBT.B.5
Multiply a whole number of up to four digits by a one-digit whole number, and multiply two two-digit numbers, using strategies based on place value and the prop...
- CCSS.Math.Content.3.NBT.A.3
Multiply one-digit whole numbers by multiples of 10 in the range 10—90 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations...
- CCSS.Math.Content.3.NBT.A
Use place value understanding and properties of operations to perform multi-digit arithmetic.
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