New
New
Year 2
Add multiples of 10 to 2-digit numbers.
I can use number facts to add multiples of 10 to two-digit numbers.
New
New
Year 2
Add multiples of 10 to 2-digit numbers.
I can use number facts to add multiples of 10 to two-digit numbers.
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Lesson details
Key learning points
- When adding multiples of ten to a two-digit number, the tens digit changes but the ones digit stays the same.
- Number facts can be used to help add and subtract multiples of ten to and from a two-digit number.
Keywords
Multiples of ten - The numbers that are said when we count on in tens from zero. Multiples of ten always have a ones digit of zero.
Recombine - To add the parts of a number gained through partitioning the whole to reach the whole amount again.
Common misconception
Children may automatically count on in tens to add a multiple of ten.
Discuss efficiency and compare different methods. Use practical equipment to draw attention to the relationship between adding multiples of ten in two-digit numbers and the known facts they already possess.
When writing calculations, ensure that, if written as one continuous equation, the equals sign is used correctly and only used where the quantities on each side of the sign are equal, e.g. 37 + 40 = 30 + 40 + 7 = 70 + 7 = 77
Teacher tip
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).Lesson video
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Starter quiz
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6 Questions
Q1.
Match to complete the equations.
65
49
53
99
Q2.
Match to complete the equations.
19
27
45
51
Q3.
10 + 64 =
Q4.
72 − 10 =
Q5.
Match two numbers that have a difference of 10
33
47
56
64
Q6.
45 and ___ have a difference of 10
44
54
Exit quiz
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6 Questions
Q1.
Look at the number line. What equation is it showing?
35 + 10 =
35 + 20 =
Q2.
16 + 50 = ? How many tens are being added to 16 in this equation? tens
Q3.
Which of the images represent this equation? 36 + 40 =
Q4.
Match the known facts that will help to add multiples of 10
3 tens + 4 tens = 7 tens
20 + 60 = 80
50 + 40 = 90
Q5.
What could we do to help solve this equation? 32 + 40 =
Add 3 tens and 2 tens
Add 2 tens and 4 tens
Q6.
27 + 50 =