Using four different digits, what is the least sun you can get when you add two 2-digit numbers? Write your problem.
you want the largest digits in the ones place (Why?).
what about
13+24?
10 + 23 = 33
1,2,4,9=12
To find the least sum when adding two 2-digit numbers using four different digits, we need to minimize the value of each digit. Let's break down the problem step by step.
Step 1: Choosing the first 2-digit number
To minimize the value, we should select the lowest possible digits for this number. The smallest 2-digit number using four different digits is 10. So, we can choose 10 as our first number.
Step 2: Choosing the second 2-digit number
Similarly, we want to minimize the value of the second number. Since we have already used the digit 0, we need to choose a different digit for the tens place. The lowest possible digit we haven't used yet is 1. So, for the second 2-digit number, we can choose 10 as well.
Step 3: Adding the two numbers
Adding 10 and 10, we get:
10
+ 10
------
20
Therefore, the least sum we can get when adding two 2-digit numbers using four different digits is 20.
To recap:
- First 2-digit number: 10
- Second 2-digit number: 10
- Least sum: 20