Solving problems using column addition and subtraction
I can solve problems using column addition and subtraction
Solving problems using column addition and subtraction
I can solve problems using column addition and subtraction
Lesson details
Key learning points
- When solving problems, the column addition and column subtraction algorithms are sometimes the most efficient methods.
- If the numbers have different amounts of digits, ensure the digits are aligned in their appropriate place value columns.
- Identify when regrouping is needed when carrying out column addition and subtraction.
Common misconception
Mis-align numbers when setting up algorithms if the numbers have different amount of digits. When finding 1 missing part out of 3 parts, children may perform two subtractions, which is inefficient.
When setting up the algorithm, ensure digits in the same place value place are aligned. When finding 1 missing part of 3 parts, first we add the known parts then we subtract from the whole.
Keywords
Regroup - The process of unitising and exchanging between place values is known as regrouping. For example, 10 tens can be regrouped for one hundred; one hundred can be regrouped for 10 tens.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
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