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Students identify and record the number of significant numbers in both whole numbers and decimal numbers in a range of contexts.

Students identify significant figures in given numbers, and round numbers to a given number of significant figures.

Students convert numbers from standard form to ordinary form.

Students order small numbers written in standard form, and explain why they are ordered in that way. The numbers are the lengths of some microscopic animals.

Students round given decimal numbers to the nearest tenths, hundredths, and thousandths and identify possible original numbers from rounded numbers.

Students write decimal fractions as percentages.