Addition Strategies and Open Number Lines

This video tutorial teaches how to add numbers within 100 using an open number line. It begins with an introduction to the concept and reviews making 10 and skip counting by 10s. The tutorial then demonstrates using an open number line to add numbers, emphasizing the importance of hopping to the nearest 10 and decomposing numbers for easier addition. It also addresses common misunderstandings related to place value in addition. The video concludes with examples of adding numbers using the open number line method.

What is the first step in finding the sum of 46 plus 8 by hopping to the nearest 10?

• Multiply 46 by 8

• Add 8 directly to 46

• Decompose 8 into 4 and 4

• Subtract 8 from 46

Which of the following is NOT a way to make 10?

• 4 plus 6

• 5 plus 6

• 3 plus 7

• 1 plus 9

What are multiples of 10 also known as?

• Friendly numbers

• Odd numbers

• Prime numbers

• Composite numbers

How can an open number line help in addition?

• By allowing jumps of 10s or 1s

• By dividing numbers

• By subtracting numbers

• By multiplying numbers

What is the sum of 14 plus 3 using an open number line?

• 18

• 17

• 16

• 19

What is a common mistake when adding numbers with different place values?

• Dividing 1s by 10s

• Adding 1s with 10s

• Multiplying 1s with 10s

• Subtracting 1s from 10s

What is the result of adding 68 plus 7 using an open number line?

• 74

• 75

• 77

• 76

How many hops are needed to reach the next group of 10 from 29?

• 2 hops

• 1 hop

• 3 hops

• 4 hops

What is the sum of 29 plus 9 using an open number line?

• 36

• 37

• 39

• 38

What is the final sum of 46 plus 8 using the open number line method?

• 55

• 54

• 53

• 52