Mrs. kennedy is buying pencils for each of 315 students at hamilton elementary. the pencils are sold in boxes of tens. how can she use rounding to decide how many pencils to buy?

It is a given that Mrs. Kennedy can not purchase half a pack of pencils, however, she needs 315 pencils for each student. Because you can not achieve the product 315 by multiplying by 10, Mrs. Kennedy will have to round up in order to have enough pencils for each student. Rounding up to the nearest ten, your result would be 320. With this number, Mrs. Kennedy can determine that she should purchase 32 packs of pencils, as each pack contains 10 pencils, and she would need at least 320 to meet her requirement.

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b

13

step-by-step explanation:

divide the cost of the total of sodas you bought by the cost of one soda, for example:

$24.57 divided by $1.89 is 13 which means you bought 13 sodas