add. write the doubles fact used to solve each one.
0+1=1
6+7 =13
4+3=7
please explain how to use doubles plus 1 and doubles minus 1
my son is in 1st grade the question is 7+8= what is the doubles plus 1 and doubles minus 1
To find the doubles fact used to solve each addition problem, we need to understand the concepts of "doubles plus one" and "doubles minus one."
1) 0 + 1 = 1:
In this case, there are no doubles involved. To solve this addition problem, simply add 0 and 1 to get the sum 1.
2) 6 + 7 = 13:
To find the doubles fact used here, we use the concept of "doubles plus one." A doubles fact is when you add a number to itself. For example, the doubles fact for 6 is 6 + 6 = 12. When we add 1 to this doubles fact (12 + 1), we get the sum of 13, which is the answer to the given addition problem.
3) 4 + 3 = 7:
In this case, the doubles fact isn't used, but we can use the concept of "doubles minus one" to help us. The doubles fact for 4 is 4 + 4 = 8. To find the sum of 4 + 3, we can subtract 1 from the doubles fact: 8 - 1 = 7. So, the doubles fact used here is 4 + 4 - 1 = 7.
To summarize:
- For 0 + 1 = 1, there is no doubles fact used.
- For 6 + 7 = 13, the doubles fact used is 6 + 6 + 1 = 13 (doubles plus one).
- For 4 + 3 = 7, the doubles fact used is 4 + 4 - 1 = 7 (doubles minus one).