Posted by Peter on 14th May 2009

Understand relationships between addition, subtraction, multiplication and division

understand-relationships-1Not many questions on this page but an impressive number of maths concepts needed to answer the questions correctly. These include:

Understanding that addition can be done in any order so: 50 + 15 = 15 + 50

Understanding that 45 – 31 is different from 31 – 45

Understanding that addition reverses subtraction, ie addition is the inverse of subtraction

Understanding that division reverses multiplication, ie division is the inverse of multiplication

Understanding that 16 ÷ 8 does not equal 8 ÷ 16

Begin to understand the commutative law (although not the term)

Example of the commutative law:  24 x 12 = 12 x 24

If a child has cracked all these ideas they are well on the way to success.

Understand relationships between addition, subtraction, multiplication and division

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