Week 12 · Family Feast

Tuesday

Work backward from mealtime

// Plan it, cook it, share it

⏱ about 15 min

Tuesday: Work Backward from Mealtime

Bennie the Bear wants the soup ready at 6:00. But when should cooking start?

"The soup takes 45 minutes in all," says Oliver the Owl.

Ferris draws a number line. "What do you notice if we start at 6:00 and go back?"

Riley hops backward along the line. "Here is a hint," he says. "Jump back, not forward."

Start at mealtime. Take away the minutes the food needs.

Mealtime is 6:00. The soup needs 45 minutes.

Jump back 30 minutes to 5:30. Then jump back 15 more to 5:15.

Start cooking at 5:15. The soup is ready at 6:00.

Mealtime 6:00. Needs 30 minutes. Start at 5:____.

Mealtime 12:00. Needs 15 minutes. Start at 11:____.

Mealtime 5:40. Needs 25 minutes. Start at 5:____.

Some problems take two steps. A letter can stand for the unknown.

6 people each eat 2 wraps. You made 4. How many more do you need?

Step 1: 6 times 2 is 12. Step 2: 12 take away 4 is 8.

So w = 8. You need 8 more wraps.

TWO-STEP CHECK

5 people each get 3 potato wedges. You have 10. How many more do you need?

You set out 8 cups. 3 guests already have water. How many cups still need water?

Is 8 a sensible answer for "how many more wraps"?

Mealtime is 6:00. Setting the table takes 10 minutes. When do you start? Type the time, like 5:50.

WHY THIS EXERCISE10 minutes before 6:00 is 5:50.

Statement	True or false?
To work backward, you take away minutes.	?
45 minutes before 6:00 is 5:15.	?
20 minutes before 5:30 is 5:50.	?

WHY THIS EXERCISEBackward jumps give the start time.

Safety first

Your plan can include the stove or the oven.
A grown-up handles the stove and oven steps. You keep track of the time.

On paper, draw a number line from 5:00 to 6:00. Mark when each feast job starts.

What time will your feast start? When does cooking begin?

Time planner! Tomorrow is Kitchen Lab. Lucy helps you set the table.

Grown-up checked my answers