At the School Store, you purchased a pack of pencils for $2.53, a notebook for $3.69 and a Calculator for $12. What is the total cost of your purchase? i really don't know please help

Answer 1

2.53 +

3.69 +

12.00

line the three numbers up and start adding the last decimals: 3 + 9 +0 =12 write down 2 and carry the 1

then add up 5 + 6 + 0 plus the 1 you carried over to get 12, write down the 2 and carry the 1

then addup 2 + 3 + 2 plus the 1 you carried over to get 8

the answer is 18.22 = $18.22

to check you answer use the rule of 9's

add up the digits 2+5 + 3 = 10, 1+0 = 1

3+6+9 = 18 = 9,

1+ 2 = 3

1+9 + 3 = 13 1+3=4

do the same with your answer: 1+8+2+2 = 13, 1+3 =4

the 4 in the problem matches the 4 in the solution. That's not a perfect check, but it makes it about 90% certain you didn't make a mistake.

Or just add them up again, but occasionally if you made mistake the 1st time, you may just end up making

the same mistake a 2nd time. If you them up a 2nd time, put them in a different order and it would be

a better check.

Or just punch each number into a calculator and add them that way.