Counting by tens means adding ten each time as you count. You land on every tenth number. This method is useful for understanding place value, multiplication, and quick mental math.

How to Count by Tens

To count by tens, start at zero or any number and keep adding ten. Here are some examples:

• 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100…
• 100, 110, 120, 130, 140, 150…

Each number is ten more than the previous one. Counting by tens can also be done backward, such as:

100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 0…

Advanced Concepts

• Multiplication Connection: Counting by tens is a foundation for multiplication, particularly for understanding place value in numbers.
• Base-10 System: Our number system is based on ten, making counting by tens an essential math skill.
• Expanding Patterns: Counting by tens helps in learning larger number sequences, such as counting by hundreds or thousands.

Solved Exercises

Let’s count by tens from 10 to 100:

• 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

Let’s count by tens from 100 to 10:

• 100, 90, 80, 70, 60, 50, 40, 30, 20, 10.

Applications

Problem 1: Which number does not belong in the following sequence?

10, 20, 30, 35, 40, 50, 60

Problem 2: Incomplete Sequence: 10, 20, __, 40, __, 60

Given Numbers to Use: 30, 50

Question: Complete the sequence by filling in the missing numbers using the given options.

Completing a counting-by-tens sequence is a fun and effective way to reinforce number patterns and improve problem-solving skills. By practicing regularly, you’ll become more confident in recognizing multiples of 10 and applying this knowledge to real-life situations.