By Mr. Reno's class, School 5

Shelley's Salad Haven is taking inventory

of its supplies. Kieran notes the following

amounts of ingredients in inventory: 7 bags

of dry pasta noodles, 2 cases of salami, 8

pounds of croutons, 5 tubs of Italian dressing.

1. How long will each of the ingredients last

if Salad Haven uses the following each day:

0.10 of a bag of noodles

0.10 of a case of salami

0.10 of a pound of croutons

0 .10 of a tub of dressing

Draw diagrams, number sentences, or use

words to show and justify your reasoning.

2. Salad Haven's business is down and now

only uses 0.01 of each ingredient to make

salads each day. Predict how long they would

have each ingredient before running out.

Organize your work so that others can

understand your reasoning. Write in words

what is happening to the number of days in

each situation.

3. Suppose Kieran read the recipe incorrectly

and finds that Salad Haven really uses 0.20

of each ingredient to make salads each day.

How long will each ingredient last? Use

diagrams, numbers, or words to show how

you know.

This is the work that students produced as the

teacher pressed for conceptual understanding

of the mathematics through assessing and

advancing questions. Students essentially

understood that when dividing by a decimal

number less than one, the quotient will be

more than the dividend because either: you

are making groups of an amount less than

one; or you are making less than one group.

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