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Subtraction by decomposition is the way most adults are familiar with and is the way that children will ultimately use for larger numbers. Here is an introductory exploration of the idea.
The standard written method for subtraction. All these are 3-digits take away 2-digits and all cross the tens boundary.
More on the standard written method of subtraction, with zeros in the tens column which can cause difficulties.
Subtraction crossing any of the tens, hundreds and thousands boundaries. Set them all out in the standard way.
Mental subtraction using whole tens and teens.
The formal written method of subtraction using 5-digit numbers (money and decimals).
Work through sets of questions which require thinking about and using key concepts involving subtraction.
Using bar models to help with word problems and subtraction. Children choose the most appropriate method, mental or written.
Using the standard written method of subtraction, with exchanging the tens and hundreds.
Written subtraction, exchanging the thousands and hundreds.
Printable maths vocabulary covering addition and subtraction words.
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