The image you've uploaded is a completed math worksheet titled
"Addition Facts to 20 Sheet 5 Answers" from
Math-Salamanders.com, which provides answers to a set of addition problems involving three numbers, all summing up to 20 or less.
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🔢 Overview of the Worksheet
This worksheet contains
24 addition problems, each with
three addends (numbers being added). The goal is to practice basic addition skills and understand that the
order of addends does not affect the sum — a concept known as the
Commutative Property of Addition.
Each problem has been solved correctly, and the answers are written in
red.
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✔ Example Problems and Solutions
Let’s go through a few examples to illustrate how these are solved:
1.
1 + 4 + 5 = 10
→ First add: 1 + 4 = 5, then 5 + 5 = 10
2.
3 + 2 + 6 = 11
→ 3 + 2 = 5, 5 + 6 = 11
3.
7 + 2 + 1 = 10
→ 7 + 2 = 9, 9 + 1 = 10
4.
12 + 3 + 2 = 17
→ 12 + 3 = 15, 15 + 2 = 17
All answers follow this pattern — adding step-by-step.
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🔄 Key Concept at the Bottom: Commutative Property
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"What happens to the answer when you change the order of the addends?"
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Answer: *The answer stays the same.*
This is a fundamental principle in arithmetic:
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a + b + c = b + a + c = c + b + a, etc.
For example:
- 1 + 4 + 5 = 10
- 5 + 1 + 4 = 10
- 4 + 5 + 1 = 10
Even though the order changes, the total remains unchanged.
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🧠 Educational Purpose
This worksheet helps students:
- Practice mental math.
- Reinforce number sense.
- Understand that addition is commutative (order doesn’t matter).
- Build confidence in solving multi-addend problems.
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✔ Summary
- The
answers provided are correct.
- The worksheet emphasizes
addition facts up to 20.
- It teaches the
commutative property through practical examples.
- Students learn that rearranging the numbers in an addition problem
does not change the result.
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✔ Final Answer:
The answer stays the same when you change the order of the addends — this is the
commutative property of addition.
Parent Tip: Review the logic above to help your child master the concept of basic addition facts worksheet free.
