Adding and Subtracting with Number Lines

This video tutorial teaches how to use a number line for adding and subtracting numbers. It begins with an introduction to the concept, followed by a review of addition properties, such as the commutative property and the effect of adding zero. The tutorial addresses common misunderstandings, like the need to count each object individually. It then demonstrates subtraction on a number line and provides examples of more complex addition and subtraction problems. By the end, viewers will understand how to efficiently use a number line for basic arithmetic operations.

What is the result of adding zero to any number?

• The number remains the same

• The number doubles

• The number increases by one

• The number decreases by one

If you start at 3 on a number line and count up 4, where do you end up?

• At 7

• At 6

• At 5

• At 8

What is the result of subtracting 3 from 9 on a number line?

• 3

• 6

• 12

• 9

How can you efficiently add 6 and 12 using a number line?

• Start at 12 and count up 6

• Start at 0 and count up 18

• Start at 18 and count down 6

• Start at 6 and count up 12

When subtracting 6 from 18 on a number line, where do you end up?

• At 16

• At 14

• At 12

• At 10