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Maths - addition and subtraction strategies

Now that we are experts on number value, we can look at ways to add numbers together to find their total or calculate the difference between them by subtracting one from another.
Estimate first - then we know if we are about right (approximately equal).
Number lines
Column addition
Bar model to visualise worded problems

Bar model explanation :)

Check your calculation - use the inverse (opposite) operation
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