Comparing Lengths and Heights

The video tutorial teaches how to compare lengths by writing equations. It covers using real objects like erasers to measure lengths, drawing bars for visual representation, and using number lines for comparison. The tutorial also emphasizes setting up equations correctly and provides practical examples of length changes through subtraction and addition. The lesson concludes with a final example and a summary of the concepts learned.

What is the first step in comparing the lengths of two pencils using real objects?

• Use a string to measure the pencils.

• Estimate the length by eye.

• Use erasers to measure each pencil.

• Measure both pencils with a ruler.

How do you find the difference in length between two objects using bars?

• Subtract the shorter bar from the longer bar.

• Multiply the lengths of both bars.

• Divide the longer bar by the shorter bar.

• Add the lengths of both bars.

What is the difference in height between a sign and a boy if the sign is 48 inches and the boy is 39 inches?

• 11 inches

• 10 inches

• 7 inches

• 9 inches

What is a common mistake when setting up an equation to compare lengths?

• Using a ruler instead of a number line.

• Placing the missing number in the wrong position.

• Forgetting to draw bars.

• Using addition instead of subtraction.

When using a number line to find the length of a carpet after cutting, what is the first step?

• Start at zero and count forward.

• Start at the total length and count backward.

• Start at zero and count backward.

• Start at the total length and count forward.

What should you do if an equation for comparing lengths doesn't make sense?

• Use a different method to compare.

• Re-evaluate the equation setup.

• Ignore it and move on.

• Add more numbers to the equation.

If a board is 11 feet long and 3 feet are cut off, how long is the remaining piece?

• 9 feet

• 7 feet

• 8 feet

• 14 feet

How much longer will Reggie's driveway be if it is extended by 5 meters?

• 10 meters

• 13 meters

• 12 meters

• 15 meters

How do you determine how much a child has grown between two grades?

• Multiply the heights from both grades.

• Subtract the height in the first grade from the height in the second grade.

• Add the heights from both grades.

• Divide the height in the second grade by the height in the first grade.

What is the correct equation to find the difference in height between two grades if the heights are 53 inches and 47 inches?

• 53 - 47

• 53 + 47

• 47 - 53

• 47 + 53