Written Addition Algorithm
Add digits column by column carrying ten to the next place.
Key idea
Add digits column by column carrying ten to the next place.
In depth
Stack numbers so places align, add column from right to left, and carry any ten into the next column. This is just place value made mechanical.
Worked example
358 + 476: 8+6=14 write 4 carry 1; 5+7+1=13 write 3 carry 1; 3+4+1=8. Answer 834.
Real-world uses
- Adding large sums such as household bills or population totals on paper
Common mistake
Misaligned columns, especially with numbers of different lengths.
How to learn this
- Read the key idea and say it in your own words.
- Work through the worked example, then try a similar problem.
- Use the interactive lesson’s visual and mini-quiz to check the pattern.
Frequently asked questions
What is Written Addition Algorithm?
Add digits column by column carrying ten to the next place. It is a topic at the beginner level in Arithmetic & Number Sense.
Where is Written Addition Algorithm used in real life?
Real-world examples: Adding large sums such as household bills or population totals on paper.
What should I learn before Written Addition Algorithm?
Make sure you are comfortable with Word Problems, the previous topic in Arithmetic & Number Sense.
What is a common mistake with Written Addition Algorithm?
Misaligned columns, especially with numbers of different lengths.
How can I practise Written Addition Algorithm?
Open the interactive lesson, play with the visual, then answer the three-question mini-quiz. Getting two right marks the topic complete.
What comes after Written Addition Algorithm?
Move on to Written Subtraction Algorithm next.
Related beginner topics in Arithmetic & Number Sense
- Counting & Cardinality – Assigning one number word to each object to find how many there are.
- Place Value – The value of a digit depends on its position: ones, tens, hundreds and so on.
- Number Line – A line where numbers are placed in order at equal spacing to compare and add them.
- Comparing Numbers – Use <, > and = to say which number is smaller, larger or equal.
- Ordering Numbers – Arranging numbers from least to greatest or the reverse.
- Even and Odd Numbers – Even numbers divide by 2 with no remainder; odd numbers leave remainder 1.