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olchik [2.2K]
3 years ago
10

Mrs.Kennedy is buying pencils for each of 315 students at Hamilton Elementary. The pencils are sold in boxes of tens. How can sh

e use rounding to decide how many pencils to buy?
Mathematics
2 answers:
ycow [4]3 years ago
5 0
Since 5 is closer to 10 then it is to zero, the tens column will be pushed up by one. the answer is-
320. she will have 5 extra pencils
g100num [7]3 years ago
4 0

Mrs Kennedy is buying pencils for 315 students.

The pencils are sold in boxes of 10.

Therefore the number of pencils she needs to buy should be a multiple of 10, so that she can buy boxes of 10 pencils each.

number of students are 315 but 315 is not a multiple of 10

so we have to round off 315 to the nearest ten, that's 320.

so then she has to buy 320 pencils

number of boxes she needs - 320 / 10 = 32 boxes of pencils

she only needs pencils for 315 students so she will have 5 extra pencils

she will have to buy 32 boxes

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