What is Counting in Eights?

S0-SA1-1438

Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

Counting in eights means adding 8 repeatedly to a starting number. It's a way of skip counting where you jump by 8 each time. This helps you quickly find numbers that are multiples of 8.

Simple Example

Quick Example

Imagine you are counting the legs of octopuses. Each octopus has 8 legs. If you have 1 octopus, you count 8 legs. For 2 octopuses, you count 8, then 16 legs. For 3 octopuses, you count 8, 16, then 24 legs, and so on.

Worked Example

Step-by-Step

Let's count in eights starting from 0, up to 40.

Step 1: Start with 0.

Step 2: Add 8 to 0. You get 0 + 8 = 8.

Step 3: Add 8 to the new number, 8. You get 8 + 8 = 16.

Step 4: Add 8 to 16. You get 16 + 8 = 24.

Step 5: Add 8 to 24. You get 24 + 8 = 32.

Step 6: Add 8 to 32. You get 32 + 8 = 40.

Answer: The numbers when counting in eights from 0 to 40 are 0, 8, 16, 24, 32, 40.

Why It Matters

Counting in eights builds a strong foundation for understanding multiplication and division with the number 8. It's useful in everyday life, like calculating how many pieces of a snack are needed if each person gets 8. This skill is key for careers in engineering, finance, or even running a small business where quick calculations are needed.

Common Mistakes

MISTAKE: Adding a different number instead of 8, like 7 or 9. For example, counting 8, 15, 22... | CORRECTION: Always ensure you are consistently adding exactly 8 each time to the previous number.

MISTAKE: Losing track of the count and skipping a number. For example, counting 8, 16, 32... (missing 24). | CORRECTION: Double-check your addition at each step or use your fingers to count 8 steps forward.

MISTAKE: Starting the count from 1 instead of 0 or the given starting number. For example, starting 1, 9, 17... when asked to count from 0. | CORRECTION: Always begin your count from the specified starting number, which is often 0 for skip counting.

Practice Questions

Try It Yourself

QUESTION: Count in eights starting from 8, up to 40. | ANSWER: 8, 16, 24, 32, 40

QUESTION: If a box contains 8 ladoos, how many ladoos are there in 5 such boxes? Count in eights to find out. | ANSWER: 40 ladoos (8, 16, 24, 32, 40)

QUESTION: Continue the pattern by counting in eights: 12, 20, ___, ___, ___. | ANSWER: 12, 20, 28, 36, 44

MCQ

Quick Quiz

Which of these sequences shows counting in eights?

7, 14, 21, 28

8, 16, 24, 32

6, 12, 18, 24

9, 18, 27, 36

The Correct Answer Is:

Option B (8, 16, 24, 32) correctly shows counting in eights because each number is 8 more than the previous one. The other options show counting in sevens, sixes, and nines, respectively.

Real World Connection

In the Real World

In India, many things are packed in groups. Imagine you are helping your parents pack 'samosas' for a party, and each tray holds 8 samosas. To quickly know how many samosas are ready after filling 3 trays, you would count in eights: 8, 16, 24. This helps in managing inventory in shops or calculating items for events.

Key Vocabulary

Key Terms

COUNTING: The act of determining the total number of items | SKIP COUNTING: Counting by a number other than 1 | MULTIPLE: A number that can be divided by another number without a remainder | SEQUENCE: A set of numbers arranged in a particular order

What's Next

What to Learn Next

Great job understanding counting in eights! Now you can explore 'What is Counting in Nines?' and 'What is Counting in Tens?'. These concepts will build on your skill of skip counting and further strengthen your multiplication tables.