21 multiplied by 1/3 will equal 7.
21 multiplied by a missing figure will give you 7.
Form an expression assuming that the missing figure that would take 21 to 7 is m.
The relevant expression will be:
21 x m = 7
21m = 7
You can then solve for m:
21m = 7
m = 7/21
m = 1/3
If 21 is multiplied by 1/3, it will give 7.
The missing figure is therefore 1/3.
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