To count to 20 and estimate quantities.
To partition teen numbers and compare.
To count to 100 in 1s/10s and compare.
To say 1/10 more or less up to 100.
To say 1 more and 1 less than a 2-digit number.
To count in 10s; say numbers 10 more/less.
Place value in 2-digit numbers.
To compare and order 2-digit numbers using place value.
To use place value to order 2-digit numbers; say 10 more or less.