Applying number bonds within twenty to add and subtract

Applying number bonds within twenty to add and subtract

Lesson details

Key learning points

  1. 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

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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
Correct answer: True
Q2.
'Counting in ones' is the most efficient way of counting
Correct answer: False
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
Correct answer: True
Q4.
'Counting all' is the most efficient way of counting
Correct answer: False
True

Lesson appears in

UnitMaths / Number sense and exploring calculation strategies