For example
Nine is a composite number because 3 rows of 3 make 9.
In Grade 3
Children arrange counters into rectangles and find the numbers with more than one arrangement.
Watch out for
Children often think every large number is composite. Some large numbers are prime, so the factors must be checked.
Say it at home
Take a number of objects and ask your child to find every equal row that works.
Try it together
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