🔢 Multiplication by 1

Interactive Mathematics Laboratory

Understanding Multiplication by 1

🎯 Key Concept

When you multiply any number by 1, the result is always the original number itself.

a × 1 = a

🔢 Whole Numbers

Any whole number multiplied by 1 equals itself:

  • 5 × 1 = 5
  • 12 × 1 = 12
  • 100 × 1 = 100

🔢 Zero

Zero multiplied by 1 equals zero:

  • 0 × 1 = 0

🔢 Fractions

Any fraction multiplied by 1 equals itself:

  • ½ × 1 = ½
  • ¾ × 1 = ¾
  • ⅔ × 1 = ⅔

🔢 Decimals

Any decimal number multiplied by 1 equals itself:

  • 3.14 × 1 = 3.14
  • 0.5 × 1 = 0.5
  • 2.75 × 1 = 2.75

💡 Why is this important?

Understanding that multiplying by 1 doesn't change a number helps us:

  • Simplify mathematical expressions
  • Understand the identity property of multiplication
  • Build a foundation for more complex math concepts

Practice Exercises

Exercise 1: Fill in the blanks

7 × 1 =
0 × 1 =
25 × 1 =
100 × 1 =

Exercise 2: True or False

½ × 1 = ½
3.5 × 1 = 3.5
0 × 1 = 1

Knowledge Check - Quiz

Complete all 10 questions to test your understanding of multiplication by 1.

0/10 completed

Question 1

What is 15 × 1?

Question 2

What is 0 × 1?

Question 3

What is ½ × 1?

Question 4

What is 3.14 × 1?

Question 5

What is 1 × 1?

Question 6

What is 1000 × 1?

Question 7

What is 0.25 × 1?

Question 8

What is ¾ × 1?

Question 9

What is 42 × 1?

Question 10

What is 2.5 × 1?