Estimating Sums and Differences in 5G

This video tutorial covers lesson 2-2 on estimating sums and differences of decimals. The objective is to teach students how to estimate sums and differences by rounding to the nearest whole number. The lesson includes a series of examples demonstrating the process of rounding and estimating, followed by practice exercises. The video emphasizes understanding the concept of estimation as finding an approximate answer rather than an exact one. Students are encouraged to apply their rounding skills to solve problems and are introduced to mathematical notation for approximation.

What is the main objective of lesson 2-2?

• To convert fractions to decimals

• To learn how to multiply decimals

• To estimate sums and differences of decimals

• To divide whole numbers

What page in the workbook should students turn to for lesson 2-2?

• Page 60

• Page 65

• Page 75

• Page 70

What does the swirly equal sign (≈) represent in math?

• Greater than

• Exactly equal to

• Approximately or about

• Less than

When rounding 22.88 to the nearest whole number, what does it become?

• 22

• 23

• 24

• 21

What is the estimated sum of 49 and 22.88 when rounded to the nearest whole number?

• 72

• 71

• 73

• 70

What is the estimated difference of 86.9 and 18 when rounded to the nearest whole number?

• 70

• 69

• 68

• 67

When rounding 38.9 to the nearest whole number, what does it become?

• 38

• 39

• 40

• 37

What is the estimated difference of 39 and 21 when rounded to the nearest whole number?

• 17

• 18

• 19

• 20

What is the estimated sum of 576 and 94.6 when rounded to the nearest whole number?

• 673

• 672

• 671

• 670

What is the term for the answer to an addition problem?

• Difference

• Sum

• Quotient

• Product