Decomposing the Numbers Worksheet
This decomposing the numbers worksheet helps kindergarten students count colored hops on a number line and write two parts for 7, 8, 9, and 10. An answer key makes checking quick.
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About this resource
Description
Decomposing numbers means breaking one number into two smaller parts, like seeing that 9 is the same as 5 and 4. This decomposing the numbers worksheet gives kindergarten students a clear, visual way to practice that idea on a number line. Each line shows hops in two colors, so children can count both parts and then write them in a number sentence.
About This Worksheet
In Part A, students look at four number lines from 0 to 10. They count the blue hops and the orange hops, then write the two parts in the boxes to finish sentences such as 9 = 5 + 4. Two number lines show different ways to make 9, and two show different ways to make 10, so children see that one number can be broken apart in more than one way. In Part B, the blue hops are already drawn. Students draw their own orange hops until they reach the total, count them, and write the missing part. Use it as a math center, a quick check after a number line lesson, or independent practice at home.
What’s Included
- 1 decomposing the numbers worksheet with six number line problems
- Part A: count blue and orange hops to show two ways to make 9 and 10
- Part B: draw the hops and write the missing part for 8 and 7
- 1 answer key page for quick checking
How This Worksheet Helps Kids
- Builds number sense by showing that every number is made of smaller parts.
- Introduces the number line as a counting tool, linking each hop to one more.
- Prepares students for making ten, fact families, and mental math in first grade.
Ideas for Teachers and Parents
Before the worksheet, tape a number line on the floor and let children hop along it, first with big blue steps and then with orange tiptoe steps. Say each split out loud, such as “nine is five and four.” After students finish, ask them to find a third way to make 9 or 10 that is not on the page. This kindergarten addition worksheet also works well in small groups, where children can compare their Part B hops and explain why every answer lands on the same number.
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