Counting and Subtracting on Number Lines

The video tutorial teaches how to use an open number line to solve subtraction problems, even when there are no unit marks or numbers. It explains the concept of number lines, demonstrates solving subtraction problems like 64 minus 15, and applies the method to a real-life story problem involving a trip to grandma's house. The lesson emphasizes the importance of consistent jump sizes on the number line and provides a step-by-step guide to solving subtraction problems by counting backwards or forwards.

What is an open number line used for in subtraction problems?

• To add numbers quickly

• To solve subtraction problems without specific unit marks

• To multiply numbers

• To divide numbers

Why is it important for the distance between numbers on a number line to be equal?

• To confuse the user

• To make the line look neat

• To allow for random jumps

• To ensure accurate counting

When solving 64 - 15 on an open number line, what is the first step?

• Jump back by 5

• Start at 15 and jump forward by 64

• Start at 64 and jump back by 10

• Jump forward by 15

In the example of 64 - 15, what is the result after subtracting 10?

• 54

• 49

• 64

• 15

How many miles are left to drive after stopping at 43 miles on a 98-mile trip?

• 45 miles

• 55 miles

• 98 miles

• 43 miles

What is the first step in solving 98 - 43 using an open number line?

• Jump back by 5

• Start at 43 and jump forward by 10

• Start at 98 and jump back by 10 four times

• Jump forward by 43

What is the alternative method to solve the problem of miles left to drive?

• Subtracting 98 from 43

• Jumping randomly on the number line

• Counting up from 43 to 98

• Counting down from 98

How many tens do you count up by from 43 to reach 93?

• 3 tens

• 5 tens

• 6 tens

• 4 tens

What is the final step in counting up from 43 to 98?

• Jump by tens

• Jump by twenties

• Jump by ones

• Jump by fives

How many total jumps are made when counting up from 43 to 98?

• 10 jumps

• 5 jumps

• 15 jumps

• 11 jumps