Mathematics Kindergarten 10 min

One less up to 5

Find one less than a number

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1

Introduction & Learning Objectives

Learning Objectives Identify the number that is one less than a given number from 2 to 5. Use objects to show what 'one less' means. Say the number that is one less than a number they hear. Use their fingers to show one less. Count backwards from 5 to 1. Draw a picture that shows one less. You have 3 yummy cookies 🍪🍪🍪. What happens if you eat one? Today, we will learn about 'one less'. This means one thing goes away. Knowing 'one less' helps us count when we share or eat snacks. Real-World Applications Eating one apple from a bowl of four. Sharing one of your five toys with a friend. One bird flying away from a group of three. Putting one block back in the box.
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Key Concepts & Vocabulary

TermDefinitionExample CountTo say numbers to find out how many.Let's count the cats! 🐈 🐈 🐈 One, two, three. NumberA word that tells us 'how many'.The number of suns is one. ☀️ LessA smaller amount or a smaller number.Two dots ⚫⚫ is less than three dots ⚫⚫⚫. One LessTo have one taken away from the group.You had 4 balls ⚽⚽⚽⚽. One less is 3 balls ⚽⚽⚽. Take AwayTo remove something from a group.We have 5 stars ⭐⭐⭐⭐⭐. Take away one star.
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Core Formulas

The One Less Rule N - 1 This is the math way to say 'take one away'. The number gets smaller. Number Sentence for 5 5 - 1 = 4 When you have 5 and take 1 away, you have 4 left. Number Sentence for 3 3 - 1 = 2 When you have 3 and take 1 away, you have 2 left.

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Sample Practice Questions

Challenging
One less than my number is 'three'. What is my number?
A.Five
B.Two
C.Three
D.Four
Challenging
Look at the pattern: 5, 4, 3, __. What number comes next? The rule is 'one less'.
A.1
B.2
C.4
D.5
Challenging
If 🔵🔵🔵 becomes 🔵🔵, what does 🔵🔵🔵🔵 become?
A.🔵🔵
B.🔵🔵🔵🔵🔵
C.🔵🔵🔵
D.🔵🔵🔵🔵

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