21a.
metric
47a.
(M)
1,000,000 (one million)
(K)
1,000 (one thousand)
(m)
.001 (one thousandth)
()
.000001 (five 0's)
(n)
.000000001 (eight 0's)
(p)
.000000000001 (eleven 0's)
72a.
1.
12 is the lowest common denominator
(other common denominators are 24, 36, etc.)
2.
8 is the lowest common denominator
(other common denominators are 16, 24, etc.)
3.
30 is the lowest common denominator
(other common denominators are 60, 90, etc.)
42
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