Using an Open Number Line to Solve Subtraction Story Problems

This video tutorial teaches how to solve subtraction math story problems using open number lines. It begins with an introduction to number lines, explaining their use in counting and how they can represent different units. The tutorial provides a detailed example of solving 64 - 15 using an open number line, emphasizing the importance of jump sizes. It then presents a story problem involving a trip to Grandma's house, demonstrating how to find the remaining distance using subtraction on a number line. An alternative method of counting up is also shown to solve the same problem, reinforcing the concept of finding missing parts in subtraction.

What is a key feature of a number line that must be consistent regardless of the unit value?

• The color of the line

• The distance between numbers

• The direction of counting

• The starting number

When using an open number line to subtract 15 from 64, what is the first step?

• Jump forward by 5

• Jump back by 5

• Jump back by 10

• Jump forward by 15

In the subtraction problem 64 - 15, what is the result after subtracting 10?

• 59

• 54

• 64

• 49

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

• 43 miles

• 55 miles

• 98 miles

• 45 miles

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

• Jump back by 10 four times

• Jump forward by 10 four times

• Jump back by 43

• Jump forward by 43

In the alternative method, what is the starting point for counting up to 98?

• 43

• 0

• 55

• 98

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

• 5 jumps

• 15 jumps

• 55 jumps

• 10 jumps