Subtraction using a Number Line

This video tutorial teaches how to solve subtraction problems using number lines. It covers the importance of understanding the scale of number lines, differentiating between counting spaces and marks, and solving subtraction problems with practical examples. The tutorial also includes a real-world application problem involving a roller coaster height requirement.

What is a common mistake when using number lines for subtraction?

• Counting the spaces instead of the unit marks

• Ignoring the scale of the number line

• Starting at the wrong number

• Counting forward instead of backward

When subtracting 10 from 75 on a number line that counts by fives, how many jumps should you make?

• One jump

• Four jumps

• Two jumps

• Three jumps

If you start at 34 and subtract 4 using a number line that counts by ones, where should you end up?

• 33

• 32

• 31

• 30

How can you simplify the subtraction of 15 from 74 using a number line?

• Subtract 5 first, then 10

• Subtract 10 first, then 5

• Think of 74 as 75 and subtract 15, then adjust

• Think of 74 as 73 and subtract 15

Dana is 13 inches too short to ride a roller coaster that requires a height of 60 inches. How tall is Dana?

• 45 inches

• 50 inches

• 47 inches

• 48 inches