Name:    Try It Out -- Chapter 6, Lesson 11: Communicate About Solving Problems

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Lex’s family drinks 1104 L of milk each year. They buy milk in 4 litre bags. How many bags of milk does the family drink in a month? Order the steps of Lex’s solution.

 a. Lex needs to divide the number of litres of milk drunk each month by the number of litres in a bag. 92 ÷ 4 = 23. Check: 23 x 4 is about 100, so the answer is reasonable. b. The family drinks 23 bags of milk each month. c. Lex needs to divide the number of litres of milk drunk in a year by the number of months.  1104 ÷ 12 = 92.  Check: 92 x 12 = 1104. d. Lex needs to determine the number of bags of milk his family drinks in a month.

1.

What is Lex’s first step?

2.

What is his second step?

3.

What is his third step?

4.

What is Lex’s final step?

A typical household in Australia uses 260 000 L of water each year. A quarter of the water is used for showers. Typically a shower uses 40 L of water. About how many showers do they have in a year?

Order the steps of the solution.

 a. Determine the number of showers the typical Australian household takes each year. b. Determine the number of showers by dividing the amount of water used in showers by 40. 65 000 ÷ 40 = 1625. Check 1625 x 40 = 65 000. c. The typical Australian household takes about 1625 showers each year. d. Determine the amount of water used in showers by dividing the amount of water used in a year by 4. 260 000 ÷ 4 = 65 000. Check: 4 x 65 000 = 260 000.

5.

What is the first step?

6.

What is the second step?

7.

What is the third step?

8.

What is the final step?