Question

problem solving

1. practice make a plan the principal ordered 215 muffins and 155 bagels. how many muffins and bagels were ordered in all?

vocabulary check
choose the correct word to complete each sentence.
reasonable regroup unknown

1. to ______ means to rename a number using place value.
2. a missing number is the ______.
3. if an answer makes sense, it is ______.

practice
mrs. lewis bought two statues for her garden. one cost $145 and one cost $262. what was the total cost?
a $117 c $407
b $317 d $410

Explanation:

Problem 9

Step1: Identify the operation needed

We need to find the total number of muffins and bagels, so we use addition. The number of muffins is 215 and the number of bagels is 155.

Step2: Perform the addition

To find the total, we add 215 and 155. So, \(215 + 155 = 370\).

The term "regroup" in mathematics refers to renaming a number using place value (for example, regrouping 10 ones as 1 ten). The other options: "reasonable" refers to an answer that makes sense, and "unknown" refers to a missing number. So the correct word is "regroup".

A "missing number" in a mathematical context is referred to as the "unknown" because it is the value that we do not know and are trying to find. "Regroup" is about renaming numbers, and "reasonable" is about the validity of an answer. So the correct word is "unknown".

Answer:

370

Problem 10