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Grade 2 - Number
Standard 2.N.7 - Identify the place value of the underlined digit with numbers up to 99.
Illustrate, concretely and pictorially, the meaning of place value for numerals to 100. • 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 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 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.