New
New
Year 2
Use efficient strategies to solve problems
I can use efficient strategies to solve addition and subtraction problems.
New
New
Year 2
Use efficient strategies to solve problems
I can use efficient strategies to solve addition and subtraction problems.
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Lesson details
Key learning points
- Known facts can be used to help us solve equations and problems efficiently.
- Numbers can be partitioned to bridge ten to help us work efficiently.
- When equations are solved, it is important to choose a strategy that allows you to solve the problem efficiently.
Keywords
Strategy - A method used to solve a problem or equation.
Data - Another word for information.
Bar chart - A graphical display of data using bars of different heights; another name for a bar graphs.
Common misconception
When faced with problems, children may revert to using inefficient counting strategies instead of more efficient calculation strategies.
Record equation required to solve a problem, then explicitly discuss the most efficient strategy to solve it, drawing on prior knowledge and strategies such as use of known facts and the bridge ten strategy.
Discuss the scales on bar charts in terms of prior understanding about number lines and, once the value of each bar has been identified, leave the value displayed next to the bar so the focus remains on answering the question rather than interpreting the scale.
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.
67 can be partitioned in different ways. Match the multiple of 10 with another number that sums to 67
7
17
27
37
47
Q2.
Which equation will come next in the pattern?
48 = 28 + 20
48 = 0 + 48
Q3.
Which of these equations show that 92 has been correctly partitioned into three parts?
92 = 50 + 30 + 2
92 = 10 + 10 + 9
Q4.
Which of these equations show that 55 has been correctly partitioned into three parts?
55 = 5 + 50 + 2
55 = 3 + 2 + 40
Q5.
What is the missing addend in this equation? 74 = 40 + + 30
Q6.
What is the missing addend in this equation? 38 = + 30 + 2
Exit quiz
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6 Questions
Q1.
Alex’s sunflower is 5 cm shorter than Sam’s. What strategy can Alex use to find how tall his sunflower is?
Subtract 5 tens from 62 cm
Subtract by bridging a multiple of 10
Q2.
There were 43 woodlice under a log. 8 woodlice crawled out. How many woodlice are left under the log? Which equation represents this problem?
43 + 8 = ___
43 + ___ = 8
Q3.
I had 39 seeds in the packet and I put in 30 more. How many seeds do I have altogether? seeds
Q4.
Look at the data in the table. There is a difference of 10 between two of the groups of birds. Which two groups of birds have a difference of 10?
Blackbird
Pigeon
Q5.
Sam saw 5 more blackbirds to add to the total. How many blackbirds did Year Two see altogether?
Q6.
Year Three saw 6 fewer pigeons than Year Two. How many pigeons did Year Three see?