McGraw Hill My Math Grade 4 Chapter 8 Lesson 1 Answer Key Factors and Multiples

All the solutions provided in McGraw Hill My Math Grade 4 Answer Key PDF Chapter 8 Lesson 1 Factors and Multiples will give you a clear idea of the concepts.

McGraw-Hill My Math Grade 4 Answer Key Chapter 8 Lesson 1 Factors and Multiples

The factors of a number help us determine whether a number is prime, composite, or neither.

Math in My World
Example 1
Blair is arranging 18 cupcakes on a shelf. Find the factors of 18. Use arrays to find the factors.
McGraw Hill My Math Grade 4 Chapter 8 Lesson 1 Answer Key Factors and Multiples 1
So, the factors of 18 are __________, __________, __________, __________, __________, and __________,
Since 18 has more than two factors, it is a composite number.
Answer:
McGraw-Hill-My-Math-Grade-4-Answer-Key-Chapter-8-Lesson-1-Factors-and-Multiples-Math in My World-Example 1

Explanation:
Number of cupcakes Blair is arranging on a shelf = 18.
Factors of 18:
1 × 18 = 18.
2 × 9 = 18.
3 × 6 = 18.
6 × 3 = 18.
9 × 2 = 18.
So, the factors of 18 are 2, 3, 6, 9, 18, and 1.
Since 18 has more than two factors, it is a composite number.

Example 2
Sarah is at the park. She counts 73 kites. Write the factors of 73 on the kite. Tell whether it is prime, composite, or neither.
McGraw Hill My Math Grade 4 Chapter 8 Lesson 1 Answer Key Factors and Multiples 2
The factors of 73 are ____________ and _____________.
Since 73 has exactly two distinct factors, it is a ___________ number.
Answer:
The factors of 73 are 1 and  73.
Since 73 has exactly two distinct factors, it is a prime number.
McGraw-Hill-My-Math-Grade-4-Answer-Key-Chapter-8-Lesson-1-Factors-and-Multiples-Math in My World-Example 2

Explanation:
Number of kites she counts = 73.
Factors of 73:
1 × 73 = 73.
A prime number is a whole number greater than 1 whose only factors are 1 and itself.
In Mathematics, composite numbers are numbers that have more than two factors.

Example 3
Tell whether 1 is prime, composite, or neither.
Find the factors of 1.
1 × 1
Since 1 only has one distinct factor, it is __________________.
Answer:
1 is a prime number.

Explanation:
1 × 1 = 1.
Factors of 1: 1 and itself.
Since 1 only has one distinct factor, it is prime number..

Talk Math
Identify the smallest prime number. Explain how you know this is the smallest prime number.
McGraw Hill My Math Grade 4 Chapter 8 Lesson 1 Answer Key Factors and Multiples 3
Answer:
1 is the smallest prime number.

Explanation:
A prime number is a number that has only two factors, that is 1 and the number itself. The smallest non-zero number is 1. 1 has only one factor which is 1 itself.

Guided Practice
Tell whether each number is prime, composite, or neither.
Question 1.
5
Answer:
5 is a prime number.

Explanation:
Number 5:
Factors of 5:
1 × 5 = 5.
A prime number is a number that has only two factors, that is 1 and the number itself.

Question 2.
15
Answer:
15 is a composite number.

Explanation:
Number 15:
Factors of 15:
1 × 15 = 15.
3 × 5 = 15.
In Mathematics, composite numbers are numbers that have more than two factors.

Question 3.
21
Answer:
21 is a composite number.

Explanation:
Number 21:
Factors of 21:
1 × 21 = 21.
3 × 7 = 21.
In Mathematics, composite numbers are numbers that have more than two factors.

Question 4.
31
Answer:
31 is a prime number.

Explanation:
Number 31:
Factors of 31:
1 × 31 = 31.
A prime number is a number that has only two factors, that is 1 and the number itself.

Question 5.
26
Answer:
26 is a composite number.

Explanation:
Number 26:
Factors of 26:
1 × 26 = 26.
2 × 13 = 26.
In Mathematics, composite numbers are numbers that have more than two factors.

Question 6.
61
Answer:
61 is a prime number.

Explanation:
Number 61:
Factors of 61:
1 × 61 = 61.
A prime number is a number that has only two factors, that is 1 and the number itself.

Leave a Comment

Scroll to Top
Scroll to Top