Three Digit Addition - With Regrouping (3 Digit Adding) Printables by Teach Simple

About this resource

What's inside this resource

Three-digit addition problems spanning nine practice pages give students repeated drill in adding pairs of three-digit numbers, with each page applying a different strategy: some require regrouping (carrying) across the ones, tens, and hundreds place, one explicitly excludes carrying, and another frames the calculation as fill-in-the-blank equations where a missing addend must be solved. A dedicated estimation page asks students to approximate the sum before calculating the exact answer, and a place-value page breaks addition into hundreds, tens, and ones components. Every page follows the same name/class header and numbered list-of-ten format, making it suited to independent seatwork or a rotating set of daily warm-ups rather than a single assignment. No answer key or instructional notes are included; the pages are pure computation practice. Students who also need practice on the subtraction side of regrouping, or a gentler ramp up from single-digit facts, can use addition and subtraction regrouping worksheets that build from one digit up to three.

In the classroom

Teaching tips & learning objectives

Learning objectives

Add two three-digit numbers using regrouping (carrying) across ones, tens, and hundreds
Add three-digit numbers without regrouping to build fluency before carrying is introduced
Estimate a sum before calculating the exact answer to check reasonableness
Decompose three-digit addends into hundreds, tens, and ones to add by place value
Solve for a missing addend in a fill-in-the-blank addition equation

Teaching tips

Assign one page per day as a warm-up since each page targets a distinct strategy rather than mixed random practice
Use the no-carrying page before the regrouping pages to isolate the carrying step for students who struggle with it
Pair the estimation page with an exact-computation page so students compare their estimate to the calculated sum
Have students check their own ones-column totals first since no answer key is provided

Skills covered

Three-digit column addition with regrouping — students carry across the ones, tens, and hundreds place in problems such as 253 + 472 and 951 + 318.
Estimation before calculation — students approximate a sum such as 672 + 158 before computing the exact total.
Place-value decomposition — students split addends into hundreds, tens, and ones before recombining sums.
Missing-addend equation solving — students find an unknown addend in equations such as ___ + 483 = 752.

Good to know

Questions teachers ask about this resource

How does the mixed-number page differ from the rest of the set?

It pairs a three-digit number with a two-digit number rather than two three-digit numbers, so students must align place values of different-length numbers.

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Curriculum

Standards, concepts & topics

Standards

2.NBT.B.7 — Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Core concepts

addition
regrouping
place value
estimation

Topics

three digit addition worksheets triple digit addition practice addition worksheets for kids elementary math worksheets

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