This video tutorial teaches how to add and subtract numbers within 20 using doubles. It begins with an introduction to doubles and reviews basic doubles facts. The concept of fact families is explained, followed by a focus on doubles fact families. The tutorial demonstrates how to use doubles plus one and doubles plus two strategies for addition. It concludes with subtraction strategies using doubles, emphasizing the relationship between addition and subtraction.

How can eight plus nine be rewritten using doubles?

• As eight plus eight plus one

• As nine plus nine minus one

• As eight plus seven plus two

• As nine plus eight minus one

What is the result of doubling the number five?

• Ten

• Fifteen

• Twenty

• Eight

Which of the following is a correct fact family for the numbers 7, 5, and 12?

• 7 + 5 = 12, 5 + 7 = 12, 12 - 7 = 5, 12 - 5 = 7

• 7 + 5 = 12, 5 + 7 = 12, 12 - 5 = 6, 12 - 7 = 4

• 7 + 5 = 12, 5 + 7 = 12, 12 - 6 = 6, 12 - 5 = 7

• 7 + 5 = 12, 5 + 7 = 12, 12 - 8 = 4, 12 - 5 = 7

What is the sum of eight plus eight?

• Twenty

• Sixteen

• Fourteen

• Eighteen

What is a common mistake when using doubles plus one?

• Doubling both numbers

• Forgetting to add one more

• Doubling the larger number instead of the smaller one

• Subtracting instead of adding

How can you use doubles to add eight plus six?

• By using six plus six plus two

• By using eight plus eight minus two

• By using five plus five plus three

• By using seven plus seven plus one

What is the result of subtracting seven from fourteen using doubles?

• Seven

• Eight

• Nine

• Six

How can you think of thirteen minus six using doubles?

• As six plus six plus one

• As eight plus eight minus two

• As seven plus seven minus one

• As five plus five plus three

What is the sum of six plus six?

• Sixteen

• Ten

• Fourteen

• Twelve

What is the result of thirteen minus six?

• Eight

• Six

• Seven

• Nine