Factorisation

Hong Kong

Stage 4 - Stage 5

What is the highest common factor of $3$3 and $15x$15`x`?

Easy

Less than a minute

What is the highest common factor of $6x$6`x` and $21$21?

Factorise the following expression by taking out the highest common factor:

$7x+35$7`x`+35

Factorise the following expression by taking out the highest common factor:

$48+12y$48+12`y`

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