Length word problems | Measurement and data | Early Math | Khan Academy

TL;DR

Solve various problems involving length and distance by adding or subtracting measurements.

Transcript

• Dominique drew a 72 centimeter line on the playground with blue chalk. So the line that she drew, maybe it looks something like that. And that is 72 centimeters, 72 centimeters long. So from there to there is 72 centimeters. And another line with pink chalk that is, so let's do this with pink chalk, another line with pink chalk that is 14 centime... Read More

Key Insights

• 🤩 Adding or subtracting measurements is key to solving length and distance problems.
• 🫥 Lines or cables that are longer or shorter by a certain amount can be calculated by adding or subtracting that amount from the original measurement.
• ❤️‍🩹 When lining up multiple objects end to end, the total length can be found by adding together the individual lengths.

Questions & Answers

Q: How long is the pink chalk line that Dominique drew?

The pink chalk line is 86 centimeters long because it is 14 centimeters longer than the 72 centimeter blue line. Adding 72 cm and 14 cm gives a total of 86 cm.

Q: What is the total length of the cables on the Golden Gate Bridge when lined up end to end?

The total length is 79 meters. By adding the lengths of the first cable (33 meters) and the second cable (46 meters), we get a total of 79 meters.

Q: How many centimeters did Reynaldo cut off his scarf?

Reynaldo cut off 17 centimeters of his scarf. By subtracting 19 centimeters (the final length) from 36 centimeters (the original length), we find that he cut off 17 centimeters.

Summary & Key Takeaways

• In the first example, Dominique draws a 72 cm line on the playground with blue chalk. She then draws another line with pink chalk that is 14 cm longer than the blue line, making it 86 cm long.

• The second example involves two cables on the Golden Gate Bridge. The first one is 33 meters long, and the second one is 13 meters longer, making it 46 meters long. The total length when lined up end to end is 79 meters.

• In the last example, Reynaldo has a 36 cm scarf and cuts off a portion, leaving it only 19 cm long. He cut off 17 cm from his scarf.