Grade 2 - Number
Standard 2.N.7 - Understand the place values of tens and ones. Convert numbers into tens and ones to solve.
Included Skills: Addition
Illustrate, concretely and pictorially, the meaning of place value for numerals to 100. • Achievement Indicators - Explain and show with counters the meaning of each digit for a given 2-digit numeral with both digits the same, e.g., for the numeral 22, the first digit represents two tens (twenty counters) and the second digit represents two ones (two counters). - Count the number of objects in a given set using groups of 10s and 1s, and record the result as a 2-digit numeral under the headings of 10s and 1s. - Describe a given 2-digit numeral in at least two ways, e.g., 24 as two 10s and four 1s, twenty and four, two groups of ten and four left over, and twenty four ones. - Illustrate using ten frames and diagrams that a given numeral consists of a certain number of groups of ten and a certain number of ones. - Illustrate using proportional base 10 materials that a given numeral consists of a certain number of tens and a certain number of ones. - Explain why the value of a digit depends on its placement within a numeral.