common multiple

My 9 yr old sons homework is about common multiples! Help how do I work the these out the main question we are stuck on is the 'tenth common multiple of 5 and 10?
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1 Answer

me NEVER herd av a "kommon multipel"

a "multipel" meen yu multipli (times) yer start number...x, 2, 3x, 4, 5x, 6x, ...

me ges sum nutty guvt krat invent "kommon multipel" just so her kan pretend her

no sumthun no won els no

me ges anser=5*10=50
by

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