Question

How can this addition problem be solved using friendly numbers?

59 +18
Enter your answers in the boxes.
Step 1: Use a friendly number: 59 + 1 = 60
Step 2: Adjust the other addend: 18--
Step 3: Add the two sums: The sum is
So, 59+18 77

Answer 1

✨To solve the addition problem 59 + 18 using friendly numbers, one can use the following steps:

Step 1: Round the addends to friendly numbers. For example, 59 can be rounded up to 60, and 18 can be rounded up to 20.

Step 2: Adjust the addends to account for the rounding. Since 59 was rounded up to 60, we need to subtract 1 from 18 to keep the equation balanced. So, we can rewrite the problem as 60 + 17.

Step 3: Add the adjusted addends together. 60 + 17 equals 77.

Therefore, the solution to the addition problem 59 + 18 using friendly numbers is 77.

! ✨