Assign each student a partner. Give each partner
team a recipe. Each partner team is to calculate the
recipe for a number of servings other than the one
indicated on the original recipe. Students may increase
or decrease the original recipe (for example, they
may calculate for 6 servings instead of 9, or for
2 servings instead of 8). Set a time limit. The partner
team who has the most correct "fraction conversions"
at the end of the time limit wins. (A small prize
for the winning team is appropriate.)
Note: Each team should have recipes with approximately
the same number of ingredients and approximately the
same skill level. Be prepared to award several small
prizes, for teams may tie.