N.1.6.3 Select between two possible estimates for a given quantity, and explain the choice.
N.1.7 Illustrate, concretely and pictorially, the meaning of place value for numerals to 100.
N.1.7.1 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).
N.1.7.2 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.
N.1.7.3 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.