2.9 Use place value to recognize difference between two numbers: Eg. 8,537 is 400 less than 8,937 because the hundreds place values differ by 4.
2.10 Use place value to recognize the advantage of a positional number system over a character based system: : historical comparison of relevant number systems.
Standard 5
2.11 Express large numbers using scientific notation.
2.12 Use place value to express numbers in bases other than 10: : use bases smaller and larger than 10.
Standard 6
2.13 Express small numbers using scientific notation: every place value is 10x smaller than the place value to the left.
2.14 Use place values to convert between bases: to and from base 10 (bases smaller and larger than base 10); between two bases other than base 10