In this lesson, children use their knowledge of addition and subtraction and commutative law to check their calculations to ensure accuracy. There is a teaching presentation accompanied by differentiated activities with a range of fluency, reasoning and problem-solving questions.

National Curriculum Objectives:
Mathematics Year 5: 

add and subtract whole numbers with more than 4 digits, including using formal written methods (columnar addition and subtraction)
use rounding to check answers to calculations and determine, in the context of a problem, levels of accuracy
solve addition and subtraction multi-step problems in contexts, deciding which operations and methods to use and why.

Differentiation:
There are three levels of differentiation in this pack: ‘working towards,’ ‘expected’ and ‘greater depth’.

Level of this Pack:
Age: 9-10
 England & Wales: Year 5
 Scotland: Primary 5
 Rep. Ireland: Fourth Class
 Australia: Grade 4
 USA: Grade 4

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