Pedro is building a spice rack with 4 shelves that are each 0.55 meter long. At the hardware store, Pedro finds he can only buy the shelving in whole meter lengths. Exactly how many meters of shelving does Pedro need? Since he can only buy whole number lengths, how many meters of shelving should he buy?

Pedro is building a spice rack with [tex]4\text{ shelves}[/tex] and length of each rack is [tex]0.55\text{ meters}[/tex]. He can only buy whole number of lengths.

Calculation:

Step 1:

The length of the shelf is [tex]0.55\text{ meter}[/tex].

Multiply [tex]4[/tex] by [tex]0.55[/tex] to calculate the length of [tex]4[/tex] shelves.

[tex]\begin{aligned}l&=\4\times 0.55\\&=2.20\end{aligned}[/tex]

Here, [tex]l[/tex] represents the length of the [tex]4[/tex] shelves.

Step 2:

Pedro can only buy whole number lengths.

In the [tex]\text{step }1[/tex] we can see the length of the shelf is not appropriate as he can by only whole numbers.

Pedro needs exactly [tex]2.2\text{ meters}[/tex] of shelving.

Therefore, the number [tex]2.20[/tex] lies between [tex]2[/tex] and [tex]3[/tex].

The number [tex]2[/tex] is not correct as the length should be at least [tex]2.20\text{ meters}[/tex].

Therefore, Pedro should buy [tex]3\text{ meters}[/tex] of the shelving.

Thus, the required length of the shelf is [tex]\boxed{\bf 3\text{\bf\ meters}}[/tex].

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Answer details:

Grade: Junior school

Subject: Mathematics

Chapter: Units and measurement

Keywords: Pedro, spice rack, meters, building rack, shelf, lengths, measurement, unit, decimal, fractions, numbers, numbering system, rational number, whole numbers.