21.01
Think of the decimal as a fraction. The .01 could go up to .99 before it turns into a 1, so that is hundredths.
Thousandths would be .001, because .001 would go up to .999 before it turns into a 1.
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One hundredth is 0.01
Write twenty-one hundredthe as a decimal
Twelve and one hundredth.
Ten and one hundredth.
51.04, probably.