A restaurant uses $2 \frac{3}{4}$ $2 3/4$ pounds of flour to make a batch of dinner rolls. About how many pounds of flour are needed if $3$ $3$ batches of dinner rolls are to be made?

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A restaurant uses $2 \frac{3}{4}$ $2 3/4$ pounds of flour to make a batch of dinner rolls. About how many pounds of flour are needed if $3$ $3$ batches of dinner rolls are to be made?

2 Answers

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Answer 1 · 2018-03-26T19:21:53

$8 \frac{1}{4}$ $8 1/4$

Explanation:

First method

$3 \times 2 = 6$ $3xx2=6$

$3 \times \frac{3}{4} = \frac{9}{4}$ $3xx3/4=9/4$

$\frac{9}{4} = 2 \frac{1}{4}$ $9/4=2 1/4$

Answer

$6 + 2 \frac{1}{4} = 8 \frac{1}{4}$ $6+2 1/4=8 1/4$

Second method

$2 \frac{3}{4} = \frac{2}{1} + \frac{3}{4} = \frac{8}{4} + \frac{3}{4} = \frac{11}{4}$ $2 3/4= 2/1 + 3/4 = 8/4 + 3/4 =11/4$

$3 \times \frac{11}{4} = \frac{33}{4}$ $3xx11/4=33/4$

Answer

$\frac{33}{4} = 8 \frac{1}{4}$ $33/4= 8 1/4$

Answer 2 · 2018-03-26T19:22:54

$8 \frac{1}{4}$ $8 1/4$ pounds of flour.

Explanation:

If you do $2$ $2$ (the whole number) times $3 = 6$ $3 = 6$ .

Leave that for now, make the $\frac{3}{4}$ $3/4$ in a percentage:

$\frac{3}{4} \cdot 100 % = 75 %$ $3/4 * 100% = 75%$

Multiply this by $3$ $3$ and you get $225 %$ $225%$ . Make this percentage into a fraction:

$\frac{225 %}{100 %} = 2.25 = 2 \frac{1}{4}$ $(225%)/(100%) = 2.25= 2 1/4$

Add the two values together:

$6 + 2 \frac{1}{4} = 8 \frac{1}{4}$ $6+ 2 1/4 = 8 1/4$

Hope this helps!

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2 Answers

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