Use number facts to add or subtract a one-digit number and a two-digit number.
I can add and subtract a single digit number and a two-digit number.
Use number facts to add or subtract a one-digit number and a two-digit number.
I can add and subtract a single digit number and a two-digit number.
Lesson details
Key learning points
- Known facts can be used to help solve equations with larger numbers.
- Partitioning a two-digit number into tens and ones can help with seeing the pattern in the ones.
- When adding to or subtracting from the ones without crossing the tens boundary, the tens digit does not change.
Common misconception
Children may not recognise known facts when addends are presented in different order, e.g. they may not use 7+1 to solve 61 +7 They may also confuse tens and ones digits.
Focus on efficient ways of working and, when working in the abstract, partition the two-digit number into tens and ones, so the tens and ones digits can be easily identified and the commutative aspect of the ones digit can be more easily seen.
Keywords
Equation - An equation has an equal sign. It shows that what is on the left of the equation is equal to what is on the right.
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).
Video
Loading...
Starter quiz
6 Questions
Exit quiz
6 Questions
3
43
6
