Adding numbers with 3 or more digits using the column method, including multiple carries.
Where your child meets this in real life: Adding up shopping totals, calculating combined distances, or totalling scores
SEAGReady breaks column addition into 3 steps, taught in order so each skill builds on the last.
Add 3+ digit numbers using column method when no column sum exceeds 9
Add 3+ digit numbers when one or more columns require carrying
Add three or more numbers using column addition
Three free sample questions from our column addition course. Every question comes with a full explanation, and hints that guide without giving the answer away.
A school library received 321 fiction books and 456 non-fiction books during the summer. How many books did the library receive in total?
Answer: A. 777 books
Set up in columns: 321 + 456 ------ Ones: 1 + 6 = 7 Tens: 2 + 5 = 7 Hundreds: 3 + 4 = 7 Answer: 777 books
Stuck? Start here: Line up the numbers by place value - ones under ones, tens under tens, hundreds under hundreds.
Ciara's family drove 367 miles on Saturday and 458 miles on Sunday during their holiday. How many miles did they drive altogether?
Answer: A. 825 miles
Set up in columns: 367 + 458 ------ Ones: 7 + 8 = 15 (write 5, carry 1) Tens: 6 + 5 + 1 = 12 (write 2, carry 1) Hundreds: 3 + 4 + 1 = 8 Answer: 825 miles
Stuck? Start here: Add the ones column first: 7 + 8 = ?
Three classes collected money for charity. Class 6A raised 234 pounds, Class 6B raised 156 pounds, and Class 6C raised 378 pounds. How much did the three classes raise altogether?
Answer: A. 768 pounds
Set up in columns: 234 156 + 378 ------ Ones: 4 + 6 + 8 = 18 (write 8, carry 1) Tens: 3 + 5 + 7 + 1 = 16 (write 6, carry 1) Hundreds: 2 + 1 + 3 + 1 = 7 Answer: 768 pounds
Stuck? Start here: Write all three numbers in columns, aligned by place value.
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
A school library received 234 new fiction books and 451 non-fiction books during the summer.
How many books did the library receive in total?
234 + 451
Step 1 of 5
A school library received 234 new fiction books and 451 non-fiction books during the summer.
How many books did the library receive in total?
The library received 685 books in total.
The key insight: Line up the digits by place value - ones under ones, tens under tens!
Watch out: Writing 234 + 451 as 234 + 45 1 (misaligned). If digits aren't aligned, you add different place values together and get the wrong answer.
These are the misconceptions we see most often in column addition, including the ones our practice questions are specifically designed to catch.
Struggling with column addition? The real gap is often in one of these earlier topics.
SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.