KnowledgeMadeFun, home

Grade 3, Operations

Add 3-digit numbers

Stacked addition with sums up to 1000, regrouping once or more.

Three levels

One skill, rising difficulty

Each sheet carries one level. The three are the same skill at rising difficulty, each named for what it practises.

Level 1: No regrouping
Add.
Level 2: Regrouping once
Add. Regroup when you need to.
Level 3: Regrouping more than once, some 2-digit addends
Add. Regroup when you need to.

Worked example

How the sheet explains it

The helper printed at the top of each sheet: one solved example and the steps a student follows, before the first question. Every number sentence in it is proven by the same checker as the answer key.

Level 1: No regrouping

  1. Line up the places. Add the ones: 2 + 5 = 7.
  2. Add the tens: 5 + 3 = 8.
  3. Add the hundreds: 3 + 4 = 7. So 352 + 435 = 787.

Level 2: Regrouping once

  1. Add the ones: 4 + 8 = 12. Write 2 and regroup 10 ones as 1 ten.
  2. Add the tens, with the regrouped ten: 5 + 3 + 1 = 9.
  3. Add the hundreds: 2 + 1 = 3. So 254 + 138 = 392.
  4. If the tens make 10 or more, regroup 10 tens as 1 hundred.

Level 3: Regrouping more than once, some 2-digit addends

  1. Line up the ones. Ones: 6 + 8 = 14, so write 4 and regroup 1 ten.
  2. Tens: 7 + 5 + 1 = 13. Write 3 and regroup 1 hundred.
  3. Hundreds: 4 + 2 + 1 = 7. So 476 + 258 = 734.

Goes with

Reference sheets

One-page helpers a student keeps beside this sheet:

  • Adding and subtracting in columns

Every reference, facts and support sheet is listed in the worksheet catalogue.

In the BC curriculum

Content standards

The British Columbia content standard this skill is written for, by the codes used across this site:

  • bc.math.3.c.3

The wording of each standard is on the Province's mathematics curriculum page.

Print it free

Print the sheet and its answer key

Sign in, open the skill in the teacher dashboard, pick a level and print. Each sheet comes with a fresh version code and a proven answer key.

Print it freeSign in to print
Share to Google Classroom

Any account can choose the teacher dashboard. No payment and no card.

Back to all worksheets by grade, or read the Grade 3 guide to what this grade learns in British Columbia.