Mathematical Problem Solving Techniques

This video tutorial covers various mathematical problems for seventh-grade students, including percentage increase and decrease, population changes, distance calculations, and circle area approximation. It also explores the relationship between distance and time using a snail's movement as an example. Each problem is explained step-by-step, providing a clear understanding of the concepts involved.

If a bakery used 240 kg of butter last month and increased its usage by 25% this month, how much butter did it use this month?

• 320 kg

• 280 kg

• 300 kg

• 260 kg

What is 25% of 240?

• 50

• 70

• 80

• 60

If a bakery used 300 kg of butter this month, what was the usage last month if it increased by 25%?

• 260 kg

• 250 kg

• 270 kg

• 240 kg

If the price of oranges was $1.75 per pound last week and decreased by 20% this week, what is the new price per pound?

• $1.40

• $1.50

• $1.60

• $1.30

What is 20% of $1.75?

• $0.35

• $0.30

• $0.25

• $0.40

If the price of oranges decreases by 20%, what is the percentage of the original price that remains?

• 80%

• 70%

• 90%

• 60%

If the price of oranges is $1.40 after a 20% decrease, what was the original price?

• $1.75

• $1.70

• $1.60

• $1.50

Noah believes that a 10% increase and a 10% decrease in bison population will result in the same number. Is he correct?

• It depends on the initial number

• Yes, they will be the same

• Not enough information

• No, they will be different

If a herd of bison increased by 10% from 550, what is the new population?

• 595

• 615

• 600

• 605

If a herd of bison decreased by 10% to 550, what was the original population?

• 605

• 625

• 600

• 615