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Using the strategy of factorising the multiple of 10, solve the following multiplications.
What are 10 groups of 90?

Mental strategies by multiples of 10 - Factorising multiple of 10 & 3
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Mental strategies by multiples of 10 - Factorising multiple of 10 & 3 - answer incorrect
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Mental strategies by multiples of 10 - Factorising multiple of 10 & 3 - solution 1
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Mental strategies by multiples of 10 - Factorising multiple of 10 & 3 - solution 2
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