Please be more specific. Many consumer math books have a unit 1.8 and it would be impossible to list them all.
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The math factor pairs of 18 are (1,18) , (2,9) , (3,6) .
1.An ant is determined to climb a flagpole that is 18 feet tall . Each day 2.a sphere has two sides . However there are one sided surfaces.
Regrouping simply means putting the 2+ answers into a group and subtracting all the answers together.
52
18