What is Counting by Eights?

S0-SA1-0993

Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

Counting by eights means starting from a number and repeatedly adding 8 to get the next number in the sequence. It's like taking steps of 8 instead of 1. This helps us count faster and understand patterns.

Simple Example

Quick Example

Imagine you are counting how many ladoos you need for 8 friends, and each friend gets 8 ladoos. You start with 0, then for the first friend you have 8, for the second you have 16, then 24, and so on. You are counting by eights to find the total.

Worked Example

Step-by-Step

Let's count by eights starting from 0, up to 40.
1. Start with the number 0.
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2. Add 8 to 0: 0 + 8 = 8.
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3. Add 8 to the new number (8): 8 + 8 = 16.
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4. Add 8 to 16: 16 + 8 = 24.
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5. Add 8 to 24: 24 + 8 = 32.
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6. Add 8 to 32: 32 + 8 = 40.
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So, counting by eights from 0 to 40 gives us: 0, 8, 16, 24, 32, 40.

Why It Matters

Counting by eights helps build a strong foundation for multiplication and understanding number patterns, which are key in many subjects. It's useful for engineers designing circuits, programmers working with data, and even architects planning building structures.

Common Mistakes

MISTAKE: Adding a different number instead of 8 each time. For example, 8, 16, 20 (adding 4). | CORRECTION: Always add exactly 8 to the previous number to stay on track with counting by eights.

MISTAKE: Skipping a number in the sequence. For example, 0, 8, 24 (skipping 16). | CORRECTION: Make sure to add 8 to *each* previous number to get the next one in the sequence without missing any.

MISTAKE: Starting from a number and subtracting 8 instead of adding. | CORRECTION: Counting by eights means increasing the number by 8 each time, so you must always add.

Practice Questions

Try It Yourself

QUESTION: Count by eights starting from 10, for three steps. | ANSWER: 10, 18, 26, 34

QUESTION: What number comes after 56 when counting by eights? | ANSWER: 64

QUESTION: If a bus stops every 8 km, and it has already covered 32 km, how many more kilometers will it cover to reach 56 km? | ANSWER: 24 km (56 - 32 = 24)

MCQ

Quick Quiz

Which of these sequences shows counting by eights?

5, 10, 15, 20

8, 16, 24, 32

1, 2, 3, 4

10, 20, 30, 40

The Correct Answer Is:

Option B (8, 16, 24, 32) correctly shows adding 8 to each previous number. The other options show counting by fives, ones, and tens respectively.

Real World Connection

In the Real World

In India, counting by eights can be seen in things like organizing items in sets of eight, for example, 8 oranges in a small basket, or 8 sweets in a box. You might also use it if you are planning to buy 8-packs of biscuits for a school event and need to quickly figure out totals.

Key Vocabulary

Key Terms

SEQUENCE: A list of numbers that follow a certain rule | PATTERN: A regular way in which something is done or arranged | MULTIPLICATION: A mathematical operation that is equivalent to adding a number to itself a specific number of times | ADDITION: The process of combining numbers to find their total

What's Next

What to Learn Next

Great job understanding counting by eights! Next, you can explore 'What is Counting by Nines?' or 'What is Multiplication by 8?'. These concepts will help you build on your understanding of number patterns and make calculations even faster.