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What is an algorithm?
Useful for solving problems where numbers cannot be committed to memory
can be used without understanding of numbers or processes
easy to access
What are mental computations?
encourages estimation and assessment of reasonableness of the answer
are more practical
maths that has a life long expectancy
What are some mental strategies?
empty number line
repeated addition or subtraction
bridging to the tens and across tens
rounding and estimating
What is the role of the teacher when teaching mental computation?
To expose students to a wide range of strategies so they can choose what works for them
Students use the best strategy to suit them individually
What can u do with a hundreds chart?
Jump and split strategies
can use transparent counters
jump method most effective
it is hard for students to get there head around the horizontal display
How would you combine
4+6 = 10
7+3 = 10
+ 8 = 28
What is the compensation strategy?
A strategy that is useful when one of the numbers ends in 8 or 9
Eg 52+39 think 52 + 40 = 92
Then minus the 1 you added on
What is subtilising?
The process of immediately recognising how many items are in a small group (number patterns and make estimations)
How would you solve 6x14 by multiplying the 10 and the units?
Then add together
Use place value concepts to solve
Use grouping and partitioning to solve:
4 groups of 15
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