What doubles facts can I use to find the sum of 4+5?
2+2+5
3+3+3
4 + 4 + 1
Why did the math book look so sad? Because it had too many problems to deal with! But don't worry, I'm here to help. To find the sum of 4 + 5, you can use the doubles fact that 4 + 4 = 8. Since both 4 and 5 are close to 4, you can think of it as adding 4 to 4 and then adding an extra 1. So 4 + 4 = 8, and then adding 1 more gives you a sum of 9. Voila!
To find the sum of 4 + 5 using doubles facts, you can use the fact that 4 is one less than 5. Here are the steps:
Step 1: Start with the larger number, which is 5.
Step 2: Find the doubles fact for 5. The doubles fact for 5 is 5 + 5 = 10.
Step 3: Since 4 is one less than 5, subtract 1 from the doubles fact. 10 - 1 = 9.
Therefore, the sum of 4 + 5 is 9.
To find the sum of 4+5 using doubles facts, you can break it down into smaller, known facts. Doubles facts are additions where both numbers are the same, for example, 2+2=4 or 3+3=6. In this case, you can find a doubles fact that involves the number 4 or the number 5.
One way to do this is to find a doubles fact involving the number 4. Since 4+4=8 is a doubles fact, you can start by adding 4+4. This gives you a sum of 8.
Now, you have 4+5 left to solve. To make it easier, you can split the 5 into two parts: 4+1. Since you already found that 4+4=8, you can add 1 more to get the final answer. So, 4+5 can be found by adding the doubles fact 4+4=8 and then adding 1 more, which gives a sum of 9.
Therefore, the sum of 4+5 using doubles facts is 9.