Students should partition numbers in different ways (for example, 23 = 20 + 3 and 23 = 10 + 13) to support subtraction. Students expand on this concept in 1st grade, using larger numbers and beginning to apply the same concept to digits within a number. Students will also be expected to write an equation to record their composition or decomposition, such as 10 + 8 = 18. Students will compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings. ![]() Schools that follow the Common Core State Standards will introduce students to partitioning in Kindergarten. ![]() When will my child learn about partitioning in elementary school?Ĭhildren will most likely learn about partitioning very early on in their math lessons. When shown a number (up to 7+ digits by 5th grade), children should be able to partition them independently to show a good understanding of place value. Partitioning links closely to place value: a child will be taught to recognize that the number 54 represents 5 tens and 4 ones, which shows how the number can be partitioned into 50 and 4.īy moving tens and ones between the two parts, the number can be partitioned in many other ways: Partitioning is a way of splitting numbers into smaller parts to make them easier to work with.
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