Rounding Numbers in Story Problems

The video tutorial teaches how to estimate solutions to multi-step story problems by rounding numbers. It begins with an introduction to rounding and its importance in estimation. The tutorial then explains how to round the number 18 using a number line and benchmark numbers. A story problem involving a soda can drive is introduced, where students need to estimate the total number of cans collected by rounding the numbers 372 and 436. The tutorial revisits the rounding of 18 squished cans and concludes with the final calculation of the estimated total, demonstrating that the students collected about 780 cans.

What is the main purpose of rounding numbers in multi-step story problems?

• To make calculations more complex

• To confuse the problem solver

• To estimate solutions more easily

• To avoid using a calculator

When rounding the number 18 to the nearest 10, which benchmark numbers are used?

• 0 and 10

• 10 and 20

• 15 and 25

• 20 and 30

What is the midpoint between the benchmark numbers 10 and 20?

• 12

• 18

• 14

• 15

In the soda can drive example, what is the rounded number for 372?

• 350

• 300

• 450

• 400

What is the midpoint used when rounding 436 to the nearest 100?

• 400

• 450

• 425

• 475

Why is 436 rounded down to 400 instead of up to 500?

• Because 436 is less than 450

• Because 436 is more than 450

• Because 436 is exactly 450

• Because 436 is closer to 500

After rounding, what is the estimated total number of cans collected by 2nd and 3rd grade?

• 700

• 800

• 900

• 1000

What is the rounded number for the 18 squished cans?

• 25

• 15

• 10

• 20

What is the final estimated total number of cans collected after accounting for the squished cans?

• 780

• 770

• 790

• 760

What is the key lesson learned in this video about solving multi-step story problems?

• Avoid using number lines

• Focus on exact numbers

• Estimate solutions by rounding

• Always use a calculator