The fraction may be simplified when the numerator and denominator have a common factor greater than one. Units are often referred to as ones. Eg, 4∙2 has 4 units and 2 tenths, or you could say 4∙2 has ...
A grid can be used to expand double brackets. Every term in the first bracket must be multiplied by every term in the second bracket. One bracket may be multiplied by another bracket. This is ...
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