The video tutorial covers estimation techniques using whole numbers and benchmarks. It begins with an introduction to estimation, followed by examples of estimating sums and differences using whole numbers. The tutorial then introduces benchmarks as a method for estimation, providing examples of how to apply benchmarks to both addition and subtraction problems. The focus is on understanding how to round numbers to the nearest whole number or benchmark to simplify calculations and make quick estimates.

What is the main focus of today's lesson?

• Understanding complex numbers

• Using whole numbers for estimates and benchmarks

• Learning about fractions

• Using whole numbers for exact calculations

Which whole number is 14.87 closer to?

• 13

• 16

• 15

• 14

What is the estimated sum of 14.87 and 3.15 using whole numbers?

• 19

• 18

• 17

• 16

In the money estimation example, what is $21.85 rounded to?

• $21

• $23

• $20

• $22

What is the estimated difference between $21.85 and $8.14 using whole numbers?

• $15

• $12

• $14

• $13

What are the four benchmarks used for estimation?

• 0, 0.3, 0.6, 0.9

• 0, 0.2, 0.4, 0.8

• 0, 0.1, 0.5, 1

• 0, 0.25, 0.5, 0.75

What is the benchmark closest to 13.77?

• 13.25

• 13.5

• 13.75

• 14

What is the estimated sum of 13.77 and 1.12 using benchmarks?

• 15.25

• 15

• 14.75

• 14.5

Which benchmark is closest to 1.12?

• 0

• 0.25

• 0.5

• 1

What is the estimated sum of 13.77 and 1.12 if 1.12 is rounded to 1.25?

• 14.75

• 15

• 15.25

• 15.5