New
New
Year 5
Use known facts and mental strategies to calculate with decimal numbers within and across a whole
I can use known facts and mental strategies to calculate with decimal numbers within and across a whole.
New
New
Year 5
Use known facts and mental strategies to calculate with decimal numbers within and across a whole
I can use known facts and mental strategies to calculate with decimal numbers within and across a whole.
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Lesson details
Key learning points
- If you know that 5 + 2 is equal to 7 then 5 tenths + 2 tenths is equal to 7 tenths so 0.5 + 0.2 = 0.7
- Use known facts and unitising to add tenths.
- Bridging 10 strategies with whole numbers can be applied when the tenths bridge one whole.
Keywords
Number facts - Simple calculations using two numbers are known as number facts. For example 2 + 4 = 6
Bridging - Bridging is a mental strategy which uses addition or subtraction to cross a number boundary.
Common misconception
Pupils record missing part equations incorrectly.
Encourage children to match the equation to a representation identifying which number represents the wholes and which represent parts.
Use the language of unitising to support pupils each time. For example: I know 10 ones minus 3 ones is equal to 7 ones so 10 tenths minus 3 tenths is equal to 7 tenths.
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.
Tick the number facts that make 10.
4 + 7
Q2.
Ten tenths are equal to
Q3.
I know 7 − 5 = 2 so 700 − 500 =
Q4.
Tick all of the equations that can represent this part-part-whole model.
10 = 6 − 4
6 = 10 + 4
Q5.
I know 12 − 5 = 7 so 120 − 50 =
7
17
170
Q6.
What are the missing numbers that the nine would need to be partitioned into to bridge 10 for this example.
3 and 6
2 and 7
1 and 8
Exit quiz
Download exit quiz
6 Questions
Q1.
I know 3 + 6 = 9 so 0.3 + 0.6 =
Q2.
I know 8 − 5 = 3 so 0.8 − 0.5 =
Q3.
Which of these pairs of numbers sum to make 1?
0.2 and 0.7
0.9 and 0.2
Q4.
Use a known number fact to help you solve: 1 − 0.3 =
Q5.
Fill in the missing number for the equation represented by the number line.
Q6.
Fill in the missing number: ___ − 0.7 = 0.8