an arrow means that a number divides exactly into another number ('is a factor of')
in this work it needs to be fairly often repeated that all the arrows that can be drawn have been drawn
so you cannot have a number that divides into another without there being an arrow to show this
start off with students drawing the arrows themselves:
draw all the arrows that you can to show the relationship 'is a factor of'
note that for question (1) you cannot use e.g. 3 and 6 since there is no arrow between the two blank circles (i.e. one must not be a factor of the other)
for this reason, you should not use 1 or the number itself
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