Asked by zeke
how do you check addition problems by adding up?
Let's use this addition problem as an example.
21
35
___
First you add 1 + 5. To check your work, add up, 5 + 1.
If you have a column of numbers and you go down each column to add them together, that's normal, right?
36
95
<u>15</u>
146
To check to make sure you're right, you'd add <b>from the bottom to the top</b> of each column. If you get the same answer, you know it's right.
15
95
<u>36</u>
146
That's called <b>adding up</b>.
When my mother was working for her father in the family business (long before calculators or computers) and had to add long columns of numbers, adding down was the standard; then adding up was the double-check.
=)
thank you.
thank you,that was very helpful.
Let's use this addition problem as an example.
21
35
___
First you add 1 + 5. To check your work, add up, 5 + 1.
If you have a column of numbers and you go down each column to add them together, that's normal, right?
36
95
<u>15</u>
146
To check to make sure you're right, you'd add <b>from the bottom to the top</b> of each column. If you get the same answer, you know it's right.
15
95
<u>36</u>
146
That's called <b>adding up</b>.
When my mother was working for her father in the family business (long before calculators or computers) and had to add long columns of numbers, adding down was the standard; then adding up was the double-check.
=)
thank you.
thank you,that was very helpful.