Best Buys

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Question 1 of 3

1. Question
Find the best value among the following tubs of ice cream.
- 1. Mango
- 2. Vanilla
- 3. Raspberry
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There are $2$ $2$ ways of identifying the best buy among a list of items.

$1 .$ $1.$ Find the dollars per unit of each item, or
$2 .$ $2.$ Find the units per dollar of each item

Since the values are given in dollars per litre, let’s find the dollars per $1$ $1$ litre of each item.

Mango:

$$ 6.95$ $$6.95$ $=$ $=$ $1 L$ $1L$

Vanilla:

$$ 8.95$ $$8.95$ $=$ $=$ $1.5 L$ $1.5L$

$$ 8.95$ $$8.95$ $\div 1.5$ $-:1.5$ $=$ $=$ $1.5 L$ $1.5L$ $\div 1.5$ $-:1.5$ Divide both sides by $1.5$ $1.5$

$$ 5.97$ $$5.97$ $=$ $=$ $1 L$ $1L$

Raspberry:

$$ 18.05$ $$18.05$ $=$ $=$ $3 L$ $3L$

$$ 18.05$ $$18.05$ $\div 3$ $-:3$ $=$ $=$ $3 L$ $3L$ $\div 3$ $-:3$ Divide both sides by $3$ $3$

$$ 6.05$ $$6.05$ $=$ $=$ $1 L$ $1L$

Among the three items, Vanilla ice cream has the lowest dollar per litre. Therefore, it is the best buy.

Vanilla

Question 2 of 3

Find the best buy among these three packets of potato chips.

1. Salty
2. Rocky
3. Crispee

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There are

2

$2$ ways of identifying the best buy among a list of items.

1 .

$1.$ Find the dollars per unit of each item, or

2 .

$2.$ Find the units per dollar of each item

Since the values are given in grams per dollar, let’s find the grams per

$ 1

$$1$ of each item.

Crispee:

$60$ $60$ g	$=$ $=$	$99$ $99$ c
$60$ $60$ g	$=$ $=$	$$ 0.99$ $$0.99$	Convert cents to dollars

	$=$ $=$	$\frac{60\mathsf{g}}{\$0.99}$	Turn values into a fraction

	$=$	$\frac{60\mathsf{g}\color{#CC0000}{\div0.99}}{\$0.99\color{#CC0000}{\div0.99}}$	Divide top and bottom by the denominator

	$=$	$\frac{60.6\mathsf{g}}{\$1}$

Rocky:

$120$ g	$=$	$$2.05$

	$=$	$\frac{120\mathsf{g}}{\$2.05}$	Turn values into a fraction

	$=$	$\frac{120\mathsf{g}\color{#CC0000}{\div2.05}}{\$2.05\color{#CC0000}{\div2.05}}$	Divide top and bottom by the denominator

	$=$	$\frac{58.5\mathsf{g}}{\$1}$

Salty:

$200$ g	$=$	$$4.40$

	$=$	$\frac{200\mathsf{g}}{\$4.40}$	Turn values into a fraction

	$=$	$\frac{200\mathsf{g}\color{#CC0000}{\div4.40}}{\$4.40\color{#CC0000}{\div4.40}}$	Divide top and bottom by the denominator

	$=$	$\frac{45.5\mathsf{g}}{\$1}$

Among the three items, Crispee has the highest grams per dollar. Therefore, it is the best buy.

Crispee

Question 3 of 3

Find the best buy among these three sizes of coffee beans.

1. Africanno
2. Braziliano
3. Turkish

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There are

$2$ ways of identifying the best buy among a list of items.

$1.$ Find the dollars per unit of each item, or

$2.$ Find the units per dollar of each item

Since the values are given in grams per dollar, let’s find the grams per

$$1$ of each item.

Braziliano:

$500$ g	$=$	$$12.85$

	$=$	$\frac{500\mathsf{g}}{\$12.85}$	Turn values into a fraction

	$=$	$\frac{500\mathsf{g}\color{#CC0000}{\div12.85}}{\$12.85\color{#CC0000}{\div12.85}}$	Divide top and bottom by the denominator

	$=$	$\frac{38.91\mathsf{g}}{\$1}$

Turkish:

$375$ g	$=$	$$9.90$

	$=$	$\frac{375\mathsf{g}}{\$9.90}$	Turn values into a fraction

	$=$	$\frac{375\mathsf{g}\color{#CC0000}{\div9.90}}{\$9.90\color{#CC0000}{\div9.90}}$	Divide top and bottom by the denominator

	$=$	$\frac{37.88\mathsf{g}}{\$1}$

Africanno:

$200$ g	$=$	$$4.99$

	$=$	$\frac{200\mathsf{g}}{\$4.99}$	Turn values into a fraction

	$=$	$\frac{200\mathsf{g}\color{#CC0000}{\div4.99}}{\$4.99\color{#CC0000}{\div4.99}}$	Divide top and bottom by the denominator

	$=$	$\frac{40.08\mathsf{g}}{\$1}$

Among the three items, Africanno has the highest grams per dollar. Therefore, it is the best buy.

Africanno

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Quiz summary

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2. Question

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3. Question

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Quizzes

$$ 8.95$ $$8.95$	$=$ $=$	$1.5 L$ $1.5L$
$$ 8.95$ $$8.95$ $\div 1.5$ $-:1.5$	$=$ $=$	$1.5 L$ $1.5L$ $\div 1.5$ $-:1.5$	Divide both sides by $1.5$ $1.5$
$$ 5.97$ $$5.97$	$=$ $=$	$1 L$ $1L$

$$ 18.05$ $$18.05$	$=$ $=$	$3 L$ $3L$
$$ 18.05$ $$18.05$ $\div 3$ $-:3$	$=$ $=$	$3 L$ $3L$ $\div 3$ $-:3$	Divide both sides by $3$ $3$
$$ 6.05$ $$6.05$	$=$ $=$	$1 L$ $1L$