Problem 20 - Fundamentals of Mathematics

Question

How should the number in the following 6 problems be read? (Write in words.) 15

Step-by-Step Solution

Answer

The number 15 is read as 'fifteen.'

Step 1: Identify the number

The given number is 15. The first step is to identify each digit of this number to understand its place value. The number 15 consists of the digits 1 and 5.

Step 2: Understand place value

In the number 15, the digit 1 is in the 'tens' place, which represents ten, and the digit 5 is in the 'ones' place, which represents five individual units.

Step 3: Formulate the number in words

Combine the place values to read the entire number. Since 15 is one of the ‘teen’ numbers, it is read as 'fifteen.'

Key Concepts

place value

Understanding place value is crucial for reading and writing numbers correctly. Place value helps us determine the value of each digit in a number based on its position.

Let's consider the number 15 to illustrate this concept. The number is made of two digits, '1' and '5'. The position of each digit gives it its value:

• The digit '1' is in the 'tens' place. This means it represents ten units or 10.
• The digit '5' is in the 'ones' place. This means it represents five individual units or simply 5.

By adding the values of these two digits based on their place values, the full numerical value becomes 10 + 5, which gives us the number fifteen.

numerical literacy

Numerical literacy is the ability to recognize and understand numbers and the symbols used in mathematical operations. It involves knowing how numbers can represent different quantities and how these quantities can be manipulated using different procedures.

Having a strong foundation in numerical literacy is vital as it aids in everyday activities, such as budgeting, time management, and problem-solving. For instance, in the case of the number 15, being numerically literate means we can:

• Understand what 15 signifies in terms of quantity, whether it's 15 apples, 15 dollars, or 15 steps.
• Break down the number into its components using place value knowledge.
• Appropriately use this number in various contexts like arithmetic operations.

Numerical literacy also lays the groundwork for more advanced mathematical concepts and helps in developing critical thinking skills.

teen numbers

Teen numbers, such as 13, 14, 15, etc., hold a special place in numerical learning because they introduce unique language elements in how we write and read them. Unlike numbers after twenty, which simply use the combination of tens and ones (e.g., twenty-one, twenty-two), teen numbers often follow unique naming conventions.

For example, the number 15 is read as "fifteen" rather than "ten-five". It's important for learners to memorize these numbers, as they do not follow the typical pattern of combining the tens and ones sounds as straightforwardly as other numbers. Teen numbers represent a blend:

• The first part of the word, like "four" in fourteen or "five" in fifteen, comes from the ones digit.
• The suffix "-teen" refers back to the number ten, indicating these numbers come after ten but are not as systematic to read as numbers beyond twenty.

By understanding teen numbers, learners can more easily connect numerical symbols to their correct verbal representations, ensuring clear communication and comprehension of quantities.