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Column Addition
Objectives
To place numbers in the correct columns, according to their place value.
To add using the written column method.
Resources
Abacus 4 Textbook 1 | Squared paper
Today's Lesson
Main Activity
Call out some large two-digit numbers to be divided by single digit numbers. There may be remainders. Do this for about ten numbers. Help your student to consolidate their understanding of division as 'grouping' by asking, e.g How many groups of 5 are in 50? What is left over if you put 67 into groups of 6?
For example:
| 50 ÷ 5 = | 67 ÷ 6 = |
Turn to page 42 in Abacus 4 Textbook 1.
Look at the example of the expanded method. This is to demonstrate the value of each digit within the numbers. It may not be necessary to write the expanded method if your student has a good understanding of place value. However, when adding a three-digit number and a two-digit number, the most important thing is to write the digits in the correct columns.
Watch the 'Column addition' video to remind your student of the compacted method.
When adding, remind your student to leave a space before we draw the line to write the answer underneath. Ask your student to remind you why we need the space above the line – for the extra tens or hundreds if the answer to a column comes to more than 9.
For example:
| 100s | 10s | 1s | |
| 2 | 7 | 2 | |
| + | 4 | 9 | |
| 1 | 1 | ||
| ________ | ________ | ________ | |
| ______ 3 | ______2 | _____ 1 |
Once your student is comfortable with the concept of column addition, ask them to copy and complete the page.
