Question

Krystal has 7 lbs of fresh dewberries. She uses 2\3 lb of dewberries to make a pint of dewberry jam. Krystal only uses the dewberries needed to make whole pints of jam and she makes as many pints as possible. How many pounds of dewberries will Krystal have left over? Responses

Answer 1

1/3 lb

Explanation:

Method 1: Use division.

How many portions of 2/3 lb are in 7 lb?

We divide 7 by 2/3.

7 ÷ 2/3 = 7 × 3/2 = 21/2 = 10.5

7 lb is equal to 10.5 portions of 2/3 lb.

Since she only makes full pints, she can make 10 pints.

Then she has 0.5 portion of 2/3 lb left.

0.5 × 2/3 = 1/2 × 2/3 = 2/6 = 1/3

She will have 1/3 lb left.

Method 2: Use logic and math.

2/3 lb makes 1 pt.

Multiply 2/3 lb by 3: 2/3 lb × 3 = 2 lb

2 lb makes 3 pints.

Multiply the above line by 3.

6 lb makes 9 pints.

After making 9 pints with 6 lb, you have 1 lb left.

1 lb = 2/3 lb + 1/3 lb

With 2/3 lb, make one more pint.

Now you have a total of 10 pints and 1/3 lb left.