1.a count within 120, forward and backward (by 1s and 10s), starting at any number; in this range, read and write numerals and represent a number of objects with a written numeral 

1.b explain that the two digits of a two-digit number represent the amounts of tens and ones (e.g., 23 is the same as 2 tens and 3 ones or 1 ten and 13 ones) 

1.c compare and order whole numbers up to 100 using concrete models, drawings, words, and the symbols >, =, and < 

2.d add and subtract fluently within 10 using a variety of strategies 

2.e use the meaning of the equal sign to determine whether equations involving addition or subtraction are true or false