Subtracting Using a Number Line

This video tutorial teaches how to subtract using a number line. It begins with an introduction to the concept and explains the decomposition of numbers for easier subtraction. The tutorial covers the flexibility of number lines in terms of range and counting methods. Two practical examples are provided: one involving balloons and another with honey jars, demonstrating subtraction by moving left on the number line. The lesson concludes by reinforcing the learned concepts.

What is the purpose of decomposing numbers in subtraction?

• To add numbers more easily

• To simplify the subtraction process

• To multiply numbers quickly

• To make numbers larger

Which of the following is a common misconception about number lines?

• They can only show numbers up to 100

• They can only be used for addition

• They can only count by ones

• They are always straight

How can you count on a number line?

• Only by tens

• Only by fives

• By any number, such as twos or tens

• Only by ones

In the balloon example, what is the first step to solve the subtraction problem?

• Find the number 20 on the line

• Find the number 38 on the line

• Find the closest ten to 38

• Find the number 18 on the line

In the honey jar example, what is the result of subtracting 32 from 56?

• 24

• 34

• 26

• 22