write 3 different ones numbers you could add to 15 without needing to regroup
1,2,3,4, the problem is not to find 3 #s to sum up to 15. but 3 #s to be added onto 15.
5+5+5
15
To find three different numbers that can be added to 15 without regrouping, we can observe that the numbers should be less than or equal to 9 since the highest single-digit number is 9. Here are three different combinations:
1) 5 + 5 + 5 = 15: Here, we can add three fives together to get 15 without needing to regroup.
2) 9 + 2 + 4 = 15: In this case, we can add 9, 2, and 4 together without needing to carry any values over to the next place.
3) 8 + 3 + 4 = 15: Again, we can add 8, 3, and 4 together without requiring any regrouping.
By choosing numbers from 1 to 9, various combinations can be formed that sum up to 15 without needing to regroup.