This is aligned with the following California State Standards:
In a series of events, identify an event as occurring before or after another event.
Communicate understanding that numbers occur in a pattern. For example, the numbers 20 to 29, 30 to 39, or 50 to 59 follow a pattern, where each number is expressed by naming the decade number and then the digit number [i.e., 24 is expressed as twenty (decade number) four (digit number)].
Communicate number words 1 to 30 in numerical order verbally. Start at a number, one or otherwise, and count objects to 30 by assigning a single number word to each object. While counting objects up to 30, demonstrate an understanding that (i) it does not matter where you start or in what order you count, (ii) the number of objects in a set remains the same, and (iii) the last number counted equals the total number of objects.
Demonstrate skip counting by multiples of 10 to count objects up to 40 [(e.g., arrange objects up to 40 in groups of 10 objects, and count the total number of objects using multiples of 10 (i.e., 10, 20, 30, 40)].
Demonstrate skip counting by tens, starting at a multiple of 10 (e.g., 30, 40, 50, 60). Use this understanding of counting by tens to count dimes and 10-dollar bills, and communicate the total value of a set (e.g., 10 + 10 + 10 dollar bills equal 30 dollars). Communicate an understanding of repeated addition as adding the same numeral a given number of times (e.g., 3 + 3 + 3 + 3 means adding 3 four times).