Mathematics
Kindergarten
10 min
Count by tens to 100
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1
Introduction & Learning Objectives
Learning Objectives
Recite the numbers from 10 to 100 by tens.
Identify the number that comes next when counting by tens.
Group objects into sets of ten to count them.
Recognize that numbers in the 'tens' sequence end with a zero.
Use a hundred chart to show the pattern of counting by tens.
Count groups of ten fingers to find a total.
Do you have ten fingers? 🖐️🖐️ Let's learn a super fast way to count them with friends!
We will learn to count by tens! It is a fast way to count big numbers. It is like taking giant steps when we count.
Real-World Applications
Counting fingers and toes in a group 🦶
Counting stacks of coins like dimes 🪙
Counting crayons in big boxes 🖍️
Counting juice boxes in a pack 🧃
2
Key Concepts & Vocabulary
TermDefinitionExample
Count by TensA fast way of counting in groups of 10.10, 20, 30, 40, 50, 60, 70, 80, 90, 100. 🚀
Group of TenA set with exactly 10 items in it.A bundle of 10 straws. A tower of 10 blocks. 🧱
PatternSomething that happens over and over again.The numbers all end in zero (0). That is a pattern!
DigitA single number, like 1, 2, or 3.The number 20 has two digits: 2 and 0.
Hundred ChartA big square with all the numbers from 1 to 100.We can find all the tens numbers in the last column. 🔟
3
Core Formulas
The Zero Ending Pattern
Number ends in 0
When we count by tens, the number always ends with a zero. It's the 'zero hero'!
The Next Ten Rule
First Digit + 1
The first digit just counts up! 1, 2, 3... So after 30 (three), comes 40 (four).
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Challenging
Start at 80. Count back by ten TWO times. What number are you on? ⏪
A.60
B.70
C.100
D.50
Challenging
A bus has 6 big seats. Each seat can hold 10 kids. If only 4 seats are full, how many kids are on the bus? 🚌
A.60
B.40
C.10
D.20
Challenging
Which of these shows counting by tens correctly?
A.10, 11, 12, 13, 14
B.10, 20, 30, 45, 50
C.10, 20, 30, 40, 50
D.5, 10, 15, 20, 25
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