•Organized method of problem-solving •Used in chemistry, physics, engineering, and medicine•Communicates the path to scientists that follow your work•Records your own path for your future use

• Calculate the number of minutes in 3.61 hours.*Note: Use the number given in the question to determine the

number of sig figs in your answer.

1. Write the given.

2. Draw the chart.

• Calculate the number of minutes in 3.61 hours.*Note: Use the number given in the question to determine the

number of sig figs in your answer.

3. Think of a relationship: 1 hr = 60 min

4. Divide the relationship in ½ at the = sign.5. Cancel units diagonally.

• Calculate the number of minutes in 3.61 hours.*Note: Use the number given in the question to determine the

number of sig figs in your answer.

6. Add the rest of the relationship.

7. Count sig figs in the given. Round the answer to that number of sig figs.

How many centimeters are in 4.2 inches?*Note: Use the number given in the question to determine the

number of sig figs in your answer.

How many centimeters are in 4.2 inches?*Note: Use the number given in the question to determine the

number of sig figs in your answer.

Calculate the number of seconds in two weeks.

Realize that we don’t know just one step from weeks to seconds.

Calculate the number of seconds in two weeks.

Start as usual.

Calculate the number of seconds in two weeks.

Extend your table.

Calculate the number of seconds in two weeks.

Continue adding relationships.

Calculate the number of seconds in two weeks.

Add as many conversions as needed.

Round to 1 sig fig.

Convert the density of 0.58 g/mL to lb/gallon. (1 L = 1.057 qt and 4 qt = 1 gal; 1kg = 2.2 lb)

Notice the use of the bottom space.

Convert the density of 0.58 g/mL to lb/gallon. (1 L = 1.057 qt and 4 qt = 1 gal; 1kg = 2.2 lb)

Ignore the bottom unit for a moment.Concentrate on converting the top unit.

Convert the density of 0.58 g/mL to lb/gallon. (1 L = 1.057 qt and 4 qt = 1 gal; 1kg = 2.2 lb)

Continue converting the top.

Stop when you get to lb…the goal.

Convert the density of 0.58 g/mL to lb/gallon. (1 L = 1.057 qt and 4 qt = 1 gal; 1kg = 2.2 lb)

Now, focus on the bottom units.

It is OK to cancel units from a distance.

Convert the density of 0.58 g/mL to lb/gallon. (1 L = 1.057 qt and 4 qt = 1 gal; 1kg = 2.2 lb)

Continue adding until you reach the goal.

If a pound of apples costs $0.79, then 5.3 lbs will cost _________.

Give your answer to TWO decimal places which is customary with

money.

1849 yards = __________ miles

Hint: 5280 ft = 1 mileGive your answer to 4 sig figs.

If Boston and New York City are 190 miles apart, then the distance

between the two cities is _______ km.

Hint: 1 km = 0.621 milesGive your answer to TWO sig figs.

If a pound of apples costs $0.79, then a shopper with $2.00 will be able to purchase ________ lbs of

apples.

Give your answer to THREE sig figs.

If a US car advertisement brags that an SVU gets 26 miles/gallon on the

highway, then the same car would be described in Europe as getting

___________ km/L.

Hint: 1 L = 1.057 qt; 4 qt = 1 gal; 1 km = 0.621 miles

Give you answer to TWO sig figs.