For example
If the group is children who like okra, the complement is every other child.
In Grade 4
Children name what is left outside a chosen group once that group has been taken away.
Watch out for
Children often forget the complement depends on the whole group being considered. Change the whole and the complement changes too.
Say it at home
Pick a group like red things and ask what everything else in the room would be.
Try it together
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