If I Know This Then I Know Addition Worksheet
This if I know this then I know addition worksheet helps 1st grade students use turnaround facts to solve sums within 20, with an answer key included for quick, confident checking.
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About this resource
Description
Knowing one addition fact can unlock another. This If I Know This Then I Know Addition Worksheet helps first graders see that the order of the addends does not change the sum. When a child knows that 8 + 5 = 13, they also know that 5 + 8 = 13. This idea is called the commutative property of addition, and many teachers call these pairs turnaround facts.
The worksheet shows seven addition facts with sums from 10 to 17. Students solve the first fact under the heading “If I know…” and write the sum in the box. Then they follow the arrow, look at the same two numbers in the other order, and solve the turnaround fact under “…then I know!” As they work, students notice that both boxes in each row hold the same answer. This 1st grade addition worksheet works well as morning work, a math center, homework, or a quick check after a lesson on addition strategies.
What’s Included
- One page with seven fact pairs, each with a turnaround fact to solve
- Addition facts with sums within 20 for extra fact practice
- A full answer key on a second page for quick checking
Why It Helps Kids Learn
First, turnaround facts cut the number of facts a child has to memorize nearly in half. Second, students build number sense when they see that a sum stays the same no matter which addend comes first. Third, the clear left-to-right layout gives children a simple routine they can use on any addition problem: solve one fact, then use it to solve its partner.
Ideas for Teachers and Parents
Before starting, show the idea with two groups of blocks, then swap the groups and count again. After students finish the If I Know This Then I Know Addition Worksheet, ask them to write their own fact pair and explain it to a partner. You can also cover the second column and have children predict the sum before they write it.
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