Applying number bonds within twenty to add and subtract
Applying number bonds within twenty to add and subtract
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Lesson details
Key learning points
- In this lesson, we will be adding and subtracting 2 digit numbers with regrouping by using our number bond knowledge. We will use number lines to visualise the process.
Licence
This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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4 Questions
Q1.
If I know that 3 plus 4 is equal to 7, then I know 3 tens plus 4 tens is equal to 70.
False
Q2.
'Counting in ones' is the most efficient way of counting
True
Q3.
If I know that 6 = 4 + 2 and 5 = 3 + 2, then I can use these facts and say that 65 - 42 = 23.
False
Q4.
'Counting all' is the most efficient way of counting
True