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Three Cryptarithms With Tight Digit Constraints

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You'll learn: Three Cryptarithms With Tight Digit Constraints

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Three Cryptarithms With Tight Digit Constraints

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Three Cryptarithms With Tight Digit Constraints

You'll learn: Three Cryptarithms With Tight Digit Constraints

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Which Numbers Are Sums of Consecutive Numbers?
You'll learn: Which Numbers Are Sums of Consecutive Numbers?
Eight Ways to Place Plus and Minus Signs
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Eight Ways to Place Plus and Minus Signs
You'll learn: Eight Ways to Place Plus and Minus Signs
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What Stays the Same in the Eight Expressions?
You'll learn: What Stays the Same in the Eight Expressions?
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Why Changing a Sign Does Not Change Parity
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One Parity Result, Two More Explanations
You'll learn: One Parity Result, Two More Explanations
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Tell Whether an Expression Is Even Without Evaluating It
You'll learn: Tell Whether an Expression Is Even Without Evaluating It
Does an Algebraic Expression Always Give an Even Number?
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Does an Algebraic Expression Always Give an Even Number?
You'll learn: Does an Algebraic Expression Always Give an Even Number?
Two Types of Even Numbers
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Two Types of Even Numbers
You'll learn: Two Types of Even Numbers
When Do Two Even Numbers Add to a Multiple of Four?
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When Do Two Even Numbers Add to a Multiple of Four?
You'll learn: When Do Two Even Numbers Add to a Multiple of Four?
Add or Subtract Two Multiples
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Add or Subtract Two Multiples
You'll learn: Add or Subtract Two Multiples
A Divisible Sum Does Not Force Divisible Parts
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A Divisible Sum Does Not Force Divisible Parts
You'll learn: A Divisible Sum Does Not Force Divisible Parts
Multiples Keep Factors—but Not Every Larger Multiple
3:30
Multiples Keep Factors—but Not Every Larger Multiple
You'll learn: Multiples Keep Factors—but Not Every Larger Multiple
When Do Two Divisibility Tests Combine?
3:29
When Do Two Divisibility Tests Combine?
You'll learn: When Do Two Divisibility Tests Combine?
Can an Odd Plus an Even Be a Multiple of Six?
3:07
Can an Odd Plus an Even Be a Multiple of Six?
You'll learn: Can an Odd Plus an Even Be a Multiple of Six?
One Remainder, Two Algebraic Descriptions
3:27
One Remainder, Two Algebraic Descriptions
You'll learn: One Remainder, Two Algebraic Descriptions