4+5=9 because your adding hold up 5 fingers in put 4 more that's 9
4+5=9 due to the fact that by adding 5 **fingers **and then put 4 more that will give you 9
What is the addition
A **doubles **fact is when you add a number to itself. In this case, the doubles fact for 5 is 5+5=10.
By the use of the **associative **property of addition, you can rearrange the parentheses to group the like terms.
Read more about **addition **here:
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The addition doubles fact that can help solve 4 + 5 is 5 + 5 = 10. By realizing that 4 + 5 is one less than 10, we find that 4 + 5 equals 9. Using counting, if you have 5 fingers on one hand and 4 on the other, together they make 9.
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