What is the main topic introduced in the video?

• Solving algebraic equations

• Estimating decimal sums and differences

• Multiplying decimals

• Dividing fractions

When rounding a number, what should you do if the digit to the right is 5 or more?

• Round down

• Ignore it

• Let it rest

• Up the score

What is the result of rounding 2.78 to the nearest whole number?

• 3

• 2

• 2.7

• 2.8

Why might you choose to overestimate the cost of an item?

• To ensure you have enough money

• To save money

• To spend less

• To confuse the cashier

What are benchmarks used for in estimation?

• To divide numbers

• To multiply numbers

• To provide reference points

• To calculate exact values

Which benchmark is 0.18 closer to on a number line divided into fifths?

• 0.50

• 0.75

• 0.25

• 0.00

What is the estimated sum of 0.18 and 0.43 using benchmarks?

• 0.50

• 0.60

• 0.75

• 0.80

Which benchmark is 0.76 closer to?

• 1.00

• 0.25

• 0.75

• 0.50

How can using different benchmarks affect your estimate?

• It always results in the same estimate

• It can change the estimate slightly

• It makes no difference

• It makes the estimate less accurate

What is the estimated difference between 0.76 and 0.22 using benchmarks?

• 0.75

• 0.50

• 0.54

• 0.60