# Mental Maths

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### Mental Maths = Minimal Effort

Mental maths allows you to calculate sums without mental effort. The average human can only store 5 to 9 items in short term memory. When you know that six eights are forty eight off by heart, you can retrieve this from long term memory without using one of your 5 to 9 short term memory items. Drawing from long term memory means you have short term storage left to hold information about the current problem you are trying to solve.

**Why do you mix up x Ã· + and - with your exercises?** This is a process call interleaved practice. Because your brain has to flip from one operation to another, you are constantly retrieving and encoding memories, thus strengthening you neural connections to that information.

## How does this fit the WA Curriculum?

- Year 2 WA Curriculum > Mathematics > Number and Algebra: (Stage 1)
- Investigate number sequences, initially those increasing and decreasing by twos, threes, fives and tens from any starting point, then moving to other sequences (ACMNA026)
- Solve simple addition and subtraction problems using a range of efficient mental and written strategies (ACMNA030)

- Year 3 WA Curriculum > Mathematics > Number and Algebra: (Stage 1)
- Recall addition facts for single-digit numbers and related subtraction facts to develop increasingly efficient mental strategies for computation (ACMNA055)
- Recall multiplication facts of two, three, five and ten and related division facts (ACMNA056)
- Represent and solve problems involving multiplication using efficient mental and written strategies and appropriate digital technologies (ACMNA057)

- Year 4 WA Curriculum > Mathematics > Number and Algebra: (Stage 1 and 2)
- Recall multiplication facts up to 10 Ã— 10 and related division facts (ACMNA075)
- Develop efficient mental and written strategies and use appropriate digital technologies for multiplication and for division where there is no remainder (ACMNA076)

- Year 5 WA Curriculum > Mathematics > Number and Algebra: (Stage 1, 2 and 3)
- Identify and describe factors and multiples of whole numbers and use them to solve problems (ACMNA098)
- Solve problems involving multiplication of large numbers by one- or two-digit numbers using efficient mental, written strategies and appropriate digital technologies (ACMNA100)
- Use efficient mental and written strategies and apply appropriate digital technologies to solve problems (ACMNA291)

- Year 6 WA Curriculum > Mathematics > Number and Algebra: (Stage 1, 2 and 3)
- Select and apply efficient mental and written strategies and appropriate digital technologies to solve problems involving all four operations with whole numbers (ACMNA123)
- Develop efficient mental and written strategies and use appropriate digital technologies for multiplication and for division where there is no remainder (ACMNA076)

- Year 7 WA Curriculum > Mathematics > Number and Algebra: (Stage 1, 2 and 3)
- Apply the associative, commutative and distributive laws to aid mental and written computation (ACMNA151)

- Year 8 WA Curriculum > Mathematics > Number and Algebra: (Stage 1, 2 and 3)
- Carry out the four operations with rational numbers and integers, using efficient mental and written strategies and appropriate digital technologies (ACMNA183)

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